Prestressed concrete secondary beam and frame structure

Abstract

The utility model provides a prestressed concrete secondary beam and a frame structure. The prestressed concrete secondary beam comprises a main body part. The main body part comprises an upper flange, a lower flange and a web plate arranged between the upper flange and the lower flange; the upper flange and the lower flange are equal in width and flush in side face, and the width of the web is smaller than that of the upper flange and the lower flange. And at least one prestressed tendon is arranged in the lower flange in the length direction in a penetrating manner. The width of the upper flange and the width of the lower flange are equal, and the side faces of the upper flange and the lower flange are flush, so that the overall shape of the main body part is regular, the rigidity of the overall structure can be maintained, the problem that the rigidity is not matched or unbalanced due to the irregular shape is solved, and the appearance is more regular. Moreover, the prestressed tendons are arranged in the lower flanges, so that the crack resistance and the bearing capacity of the prestressed concrete secondary beam can be enhanced.

Description

Technical Field

[0001] This application relates to the field of building technology. Specifically, this application relates to a prestressed concrete secondary beam and a frame structure. Background Art

[0002] In the context of the accelerating urbanization process, various buildings are increasing day by day.

[0003] The frame structure includes main beams and secondary beams. The main beam is a beam with both ends connected to columns, and the secondary beam is a beam with both ends connected to the main beam. According to the materials, the secondary beam of the steel frame structure usually adopts H-shaped steel, but the cost is high and the fire and corrosion resistance are poor. Some use solid-web concrete secondary beams, but they have a large self-weight, are inconvenient for construction, and have poor crack resistance. Utility Model Content

[0004] In view of the disadvantages of the existing methods, this application proposes a prestressed concrete secondary beam and a frame structure to solve the technical problems such as high cost, poor fire and corrosion resistance, or poor crack resistance existing in the related technologies.

[0005] In a first aspect, an embodiment of this application provides a prestressed concrete secondary beam, including: a main body part.

[0006] The main body part includes an upper flange, a lower flange, and a web provided therebetween.

[0007] The upper flange and the lower flange have equal widths and flush sides, and the width of the web is smaller than the widths of the upper flange and the lower flange.

[0008] At least one prestressed tendon is penetrated along the length direction inside the lower flange.

[0009] In some possible embodiments, the prestressed concrete secondary beam further includes: shear connectors and ends provided at both ends of the main body part.

[0010] The first part of the shear connector is inserted into the end.

[0011] The second part of the shear connector is exposed at the end and is used to connect with the main beam.

[0012] In some possible embodiments, the prestressed concrete secondary beam further includes: a plurality of stirrups.

[0013] The plurality of stirrups are arranged at intervals inside the end. The stirrups are perpendicular to the extending direction of the main body part.

[0014] The first part passes through an area surrounded or partially surrounded by at least one stirrup.

[0015] In some possible embodiments, the side surface of the shear connector is parallel to the side surface of the web.

[0016] The width of the side surface of the first part gradually decreases in the direction close to the main body part.

[0017] In some possible embodiments, the first part has a first connection hole for a first fastener to pass through and connect to the end portion.

[0018] The second part has a second connection hole for a second fastener to pass through and connect to the main beam.

[0019] In some possible embodiments, the cross-section of the second part is at least one of a straight shape, a C shape, a T shape, or an H shape.

[0020] In some possible embodiments, the prestressed concrete secondary beam further includes: embedded parts.

[0021] At least a part of the embedded part is buried in the upper flange, and the top surface is exposed from the upper flange for connecting to a steel member.

[0022] In some possible embodiments, the width of the end portion is equal to the widths of both the upper flange and the lower flange, and the side surfaces of the end portion are flush with the side surfaces of the upper flange and the lower flange.

[0023] In some possible embodiments, at least one steel bar is arranged along the length direction inside the web.

[0024] In some possible embodiments, the prestressed concrete secondary beam further includes: at least one first stiffening rib protruding from the side surface of the web, with both ends respectively connected to the upper flange and the lower flange and flush with the side surfaces of the upper flange and the lower flange.

[0025] In some possible embodiments, the cross-section of the first stiffening rib includes at least one of a triangle, a trapezoid, a rectangle, or a semi-circle.

[0026] In some possible embodiments, the prestressed concrete secondary beam further includes: anchor bars.

[0027] One end of the anchor bar is fixed inside the main body portion, and the other end extends out of the top surface of the upper flange for connecting to the steel bars or concrete inside the post-cast composite layer.

[0028] In a second aspect, an embodiment of the present application provides a frame structure applied to the structure inside a building, including: main beams arranged along at least two directions, and any prestressed concrete secondary beam provided in the first aspect as described above.

[0029] A plurality of main beams enclose and connect to columns.

[0030] The shear connectors of the prestressed concrete secondary beam are connected to the main beam.

[0031] In some possible embodiments, the main beam includes: a concrete main beam.

[0032] The concrete main beam has a reserved groove.

[0033] The second part of the shear connector of the prestressed concrete secondary beam is placed in the reserved groove.

[0034] In some possible embodiments, the frame structure further includes: a second fastener.

[0035] The second fastener passes through the second connection hole of the shear connector and is connected to the embedded part in the reserved groove of the concrete main beam.

[0036] In some possible embodiments, the main beam includes: a concrete main beam.

[0037] The side of the concrete main beam has an embedded connector.

[0038] The second part of the shear connector is attached to the embedded connector on the side of the concrete main beam and is connected by a second fastener.

[0039] In some possible embodiments, the prestressed concrete secondary beam main beam includes: a steel main beam.

[0040] The side of the steel main beam is provided with a second stiffening rib.

[0041] The second part of the shear connector is attached to the second stiffening rib and is connected by a second fastener.

[0042] In some possible embodiments, the frame structure further includes: a floor slab.

[0043] The floor slab is arranged on the top of the frame structure.

[0044] The prestressed concrete secondary beam is at least partially overlapped and connected with the floor slab.

[0045] In some possible embodiments, a convex part is arranged at the outer top end of the end of the prestressed concrete secondary beam.

[0046] The top end of the reserved groove of the concrete main beam is open.

[0047] The convex part is placed in the reserved groove.

[0048] The beneficial technical effects brought by the technical solution provided by the embodiments of the present application include:

[0049] In the embodiments of the present application, H-shaped steel is not used in the prestressed concrete thin-web secondary beam, and mainly concrete, that is, concrete material, is used, which can greatly reduce the cost of the secondary beam and improve the fire and corrosion resistance of the secondary beam; the use of a thin web can reduce the self-weight of the secondary beam and facilitate construction; and prestressed tendons are arranged, which can improve the crack resistance of the secondary beam and reduce the deflection.

[0050] Moreover, the widths of the upper flange and the lower flange are equal and their sides are flush, making the overall shape of the main body regular, which helps to maintain the stiffness of the overall structure, reduce the stiffness mismatch or imbalance problems caused by irregular shapes, and the appearance is also neater. Moreover, prestressed tendons are arranged in the lower flange, which can enhance the crack resistance and bearing capacity of the prestressed concrete secondary beam.

[0051] Additional aspects and advantages of the present application will be given in part in the following description, which will become apparent from the following description, or can be understood through the practice of the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0052] The above and / or additional aspects and advantages of the present application will become apparent and be easily understood from the following description of embodiments in conjunction with the drawings, where:

[0053] Figure 1 is a schematic structural diagram of the first prestressed concrete secondary beam provided by an embodiment of the present application;

[0054] Figure 2 is a front view structural diagram of the first prestressed concrete secondary beam provided by an embodiment of the present application;

[0055] Figure 3 is a top view structural diagram of the first prestressed concrete secondary beam provided by an embodiment of the present application;

[0056] Figure 4 is a bottom view structural diagram of the first prestressed concrete secondary beam provided by an embodiment of the present application;

[0057] Figure 5 is a side view structural diagram of the first prestressed concrete secondary beam provided by an embodiment of the present application;

[0058] Figure 6 is Figure 2 a schematic cross-sectional view at AA' in

[0059] Figure 7 is Figure 2 another schematic cross-sectional view at AA' in

[0060] Figure 8 is Figure 2 a schematic cross-sectional view at BB' in

[0061] Figure 9 is Figure 2 a schematic cross-sectional view at CC' in

[0062] Figure 10 is Figure 2 a perspective structural diagram of the shear connectors in the main body in

[0063] Figures 11-12The other two side view structural schematic diagrams of the first prestressed concrete secondary beam provided by the embodiments of the present application;

[0064] Figure 13 The structural schematic diagram of the second prestressed concrete secondary beam provided by the embodiments of the present application;

[0065] Figure 14 The front view structural schematic diagram of the second prestressed concrete secondary beam provided by the embodiments of the present application;

[0066] Figure 15 The structural schematic diagram of the third prestressed concrete secondary beam provided by the embodiments of the present application;

[0067] Figure 16 The structural schematic diagram of the fourth prestressed concrete secondary beam provided by the embodiments of the present application;

[0068] Figure 17 The front view structural schematic diagram of the fourth prestressed concrete secondary beam provided by the embodiments of the present application;

[0069] Figure 18 The structural schematic diagram of the fifth prestressed concrete secondary beam provided by the embodiments of the present application;

[0070] Figure 19 The front view structural schematic diagram of the fifth prestressed concrete secondary beam provided by the embodiments of the present application;

[0071] Figure 20 The structural schematic diagram of the sixth prestressed concrete secondary beam provided by the embodiments of the present application;

[0072] Figure 21 The front view structural schematic diagram of the sixth prestressed concrete secondary beam provided by the embodiments of the present application;

[0073] Figure 22 The top view structural schematic diagram of the sixth prestressed concrete secondary beam provided by the embodiments of the present application;

[0074] Figures 23a-23c The three side view structural schematic diagrams of the sixth prestressed concrete secondary beam provided by the embodiments of the present application;

[0075] Figures 24a-24b For Figure 20 Two cross-section schematic diagrams at DD' in;

[0076] Figure 25 The structural schematic diagram of the seventh prestressed concrete secondary beam provided by the embodiments of the present application;

[0077] Figure 26 The front view structural schematic diagram of the seventh prestressed concrete secondary beam provided by the embodiments of the present application;

[0078] Figure 27Schematic diagram of the eighth prestressed concrete secondary beam provided by the embodiment of the present application;

[0079] Figure 28 Front view structural diagram of the eighth prestressed concrete secondary beam provided by the embodiment of the present application;

[0080] Figure 29 Schematic diagram of the ninth prestressed concrete secondary beam provided by the embodiment of the present application;

[0081] Figure 30 Front view structural diagram of the ninth prestressed concrete secondary beam provided by the embodiment of the present application;

[0082] Figure 31 Schematic diagram of the tenth prestressed concrete secondary beam provided by the embodiment of the present application;

[0083] Figure 32 Front view structural diagram of the tenth prestressed concrete secondary beam provided by the embodiment of the present application;

[0084] Figure 33 Top view structural diagram of the tenth prestressed concrete secondary beam provided by the embodiment of the present application;

[0085] Figure 34 Side view structural diagram of the tenth prestressed concrete secondary beam provided by the embodiment of the present application;

[0086] Figure 35 Schematic diagram of the eleventh prestressed concrete secondary beam provided by the embodiment of the present application;

[0087] Figure 36 Front view structural diagram of the eleventh prestressed concrete secondary beam provided by the embodiment of the present application;

[0088] Figure 37 Schematic diagram of the twelfth prestressed concrete secondary beam provided by the embodiment of the present application;

[0089] Figure 38 Front view structural diagram of the twelfth prestressed concrete secondary beam provided by the embodiment of the present application;

[0090] Figure 39 Schematic diagram of the thirteenth prestressed concrete secondary beam provided by the embodiment of the present application;

[0091] Figure 40 Front view structural diagram of the thirteenth prestressed concrete secondary beam provided by the embodiment of the present application;

[0092] Figure 41 Schematic diagram of the fourteenth prestressed concrete secondary beam provided by the embodiment of the present application;

[0093] Figure 42The structural schematic diagram of the fifteenth prestressed concrete secondary beam provided by the embodiment of the present application;

[0094] Figure 43 The structural schematic diagram of the first frame structure provided by the embodiment of the present application;

[0095] Figure 44 For Figure 43 The partial enlarged schematic diagram at E in;

[0096] Figure 45 The structural schematic diagram of the connection between the concrete main beam (section) and the prestressed concrete secondary beam (front view) in an implementation manner of the first frame structure provided by the embodiment of the present application;

[0097] Figure 46 For Figure 45 The sectional schematic diagram after pouring concrete in the reserved groove 211 at FF' in;

[0098] Figure 47 The top view schematic diagram of the connection between the concrete main beam and the prestressed concrete secondary beam after pouring concrete in an implementation manner of the first frame structure provided by the embodiment of the present application;

[0099] Figure 48 The structural schematic diagram of the connection between the concrete main beam (section) and the prestressed concrete secondary beam (front view) in another implementation manner of the first frame structure provided by the embodiment of the present application;

[0100] Figure 49 The structural schematic diagram of the second frame structure provided by the embodiment of the present application;

[0101] Figure 50 The structural schematic diagram of the connection between the steel main beam (section) and the prestressed concrete secondary beam (front view) in the second frame structure provided by the embodiment of the present application;

[0102] Figure 51 The top view structural schematic diagram of the connection between the steel main beam and the prestressed concrete secondary beam in the second frame structure provided by the embodiment of the present application.

[0103] Reference numerals:

[0104] 100 - Prestressed concrete secondary beam;

[0105] 110 - Main body; 11 - Upper flange; 12 - Lower flange; 13 - Web; 131 - Hole;

[0106] 120 - Shear connector; 121 - First part of the shear connector 120; 1211 - First connection hole; 122 - Second part of the shear connector 120; 1221 - Second connection hole;

[0107] 130 - End; 140 - Stirrup; 141 - Stirrup within web 13; 150 - First fastener; 160 - Embedded part; 170 - Prestressing tendon; 171 - Steel bar within upper flange 11; 180 - First stiffening rib; 101 - Anchor bar; 102 - Protrusion;

[0108] 200 - Main beam; 210 - Concrete main beam; 211 - Reserved groove; 212 - High-strength concrete; 220 - Steel main beam; 221 - Second stiffening rib;

[0109] 300 - Second fastener;

[0110] 400 - Column. Specific implementation mode

[0111] The embodiments of the present application will be described below with reference to the accompanying drawings in the present application. It should be understood that the implementation modes described below with reference to the accompanying drawings are exemplary descriptions for explaining the technical solutions of the embodiments of the present application, and do not constitute limitations on the technical solutions of the embodiments of the present application.

[0112] Those skilled in the art of the present technology can understand that unless specifically stated, the "the" and "this" used here may also include plural forms. It should be further understood that the term "including" used in the specification of the present application means the presence of the described features, integers, steps, operations, elements and / or components, but does not exclude the implementation of other features, information, data, steps, operations, elements, components and / or their combinations, etc. supported by the art of the present technology. The term "and / or" used here means at least one of the items defined by the term. For example, "A and / or B" can be implemented as "A", or implemented as "B", or implemented as "A and B".

[0113] To make the purpose, technical solutions and advantages of the present application clearer, the embodiments of the present application will be further described in detail below with reference to the accompanying drawings.

[0114] The R & D idea of the present application includes: In the related art, there are thin-web concrete secondary beams applied to roofs or bridges. However, the thin-web concrete secondary beams applied to roofs or bridges generally have variable cross-sectional heights or variable cross-sectional widths, irregular shapes, mismatched or unbalanced stiffness, and only prestressing tendons are provided in the lower flange, resulting in poor concrete crack resistance and poor load-bearing capacity.

[0115] The prestressed concrete secondary beam and frame structure provided by the present application aim to solve the above technical problems in the related art.

[0116] The technical solutions of the present application and how the technical solutions of the present application solve the above technical problems will be described in detail below with specific embodiments. It should be noted that the following implementation modes can refer to, draw on or combine with each other. For the same terms, similar features and similar implementation steps in different implementation modes, they will not be described repeatedly.

[0117] Please refer to Figures 1-42 , an embodiment of the present application provides a prestressed concrete secondary beam 100, including: a main body portion 110.

[0118] The main body portion 110 includes an upper flange 11, a lower flange 12, and a web 13 disposed therebetween.

[0119] The upper flange 11 and the lower flange 12 have equal widths and flush sides, and the width of the web 13 is less than the widths of the upper flange 11 and the lower flange 12.

[0120] At least one prestressing tendon 170 is disposed along the length direction inside the lower flange 12.

[0121] In the embodiment of the present application, H-shaped steel is not used in the prestressed concrete thin-web secondary beam, and concrete, that is, concrete material, is mainly used, which can greatly reduce the cost of the secondary beam and improve the fire resistance and anti-corrosion performance of the secondary beam; the use of a thin web can reduce the self-weight of the secondary beam and facilitate construction; moreover, prestressing tendons are provided, which can improve the crack resistance of the secondary beam.

[0122] Moreover, the upper flange 11 and the lower flange 12 have equal widths and flush sides, making the overall shape of the main body portion 110 relatively regular, which helps to maintain the stiffness of the overall structure, reduce the stiffness mismatch problem caused by an irregular shape, and the appearance is also more neat.

[0123] Optionally, in the embodiment of the present application, at least one reinforcing bar is disposed along the length direction inside the web 13. Optionally, the reinforcing bar may include at least one of prestressed reinforcing bars, prestressed steel strands, or prestressed steel wires, which can enhance the crack resistance and load-bearing capacity of the prestressed concrete secondary beam 100 and reduce the deflection.

[0124] Optionally, at least one reinforcing bar 171 may be disposed along the length direction inside the upper flange 11. The reinforcing bar 171 may include at least one of prestressed reinforcing bars, prestressed steel strands, or prestressed steel wires, further enhancing the crack resistance and load-bearing capacity of the prestressed concrete secondary beam 100. Moreover, the upper flange 11 and the lower flange 12 have equal widths and flush sides, and the upper flange 11 also has sufficient space for disposing the reinforcing bar 171.

[0125] It should be noted that the widths of the upper flange 11, the lower flange 12, and the web 13 refer to the dimensions perpendicular to the extending direction of the main body portion 110 in the horizontal plane. The extending direction of the main body portion 110 is the length direction of the main body portion 110.

[0126] It can be understood that the prestressing tendons 170 are all disposed along the length direction of the main body portion 110. Optionally, the prestressing tendons 170 include at least one of prestressed reinforcing bars, prestressed steel strands, or prestressed steel wires.

[0127] In some possible embodiments, please refer to Figures 1-30 , the prestressed concrete secondary beam 100 further includes: a shear connector 120 and end portions 130 provided at both ends of the main body portion 110.

[0128] The first portion 121 of the shear connector 120 is inserted into the end portion 130.

[0129] The second portion 122 of the shear connector 120 is exposed from the end portion 130 for connecting to the main beam 200.

[0130] In this embodiment, please refer to Figures 1-3 and Figure 8 , the shear connector 120 has a certain rigidity, is provided at the end portion 130 of the prestressed concrete secondary beam 100, and has a certain shear resistance capacity.

[0131] As Figure 7 shown, to improve the shear resistance capacity of the end portion 130 of the secondary beam, solutions such as increasing the density of stirrups 140 in the end portion 130, increasing the diameter of the stirrups 140, or configuring bent-up bars to increase the shear resistance strengthening area are often adopted.

[0132] The embodiment of the present application can replace the solutions in the related art that increase the shear resistance strengthening area by increasing the density of stirrups 140 in the end portion 130, increasing the diameter of the stirrups 140, or configuring bent-up bars, can reduce the amount of stirrups 140 used, and thus reduce the material cost. Moreover, the shear connector 120 simultaneously functions as shear resistance and connection, can reduce the construction difficulty of the prestressed concrete secondary beam 100, and the exposed second portion 122 of the shear connector 120 is also convenient for maintenance.

[0133] In the related art, to improve the shear resistance capacity of the end portion 130 of the secondary beam, solutions such as increasing the density of stirrups 140, increasing the diameter of the stirrups 140, or configuring bent-up bars to increase the shear resistance strengthening area are often adopted, and connectors also need to be separately provided at both ends of the secondary beam, resulting in a relatively complex structure and a large amount of material usage. Therefore, the present application also provides the following implementation manner:

[0134] In some possible embodiments, refer to Figures 7-8 , the prestressed concrete secondary beam 100 further includes: a plurality of stirrups 140.

[0135] The plurality of stirrups 140 are arranged at intervals within the end portion 130. The stirrups 140 are perpendicular to the extending direction of the main body portion 110.

[0136] The first portion 121 passes through a region enclosed or partially enclosed by at least one stirrup 140.

[0137] In this embodiment, the first part 121 of the shear connector 120 passes through an area enclosed or partially enclosed by at least one stirrup 140. The shear connector 120 and the stirrups 140 in the end part 130 form a shear strengthening area. There is no need to separately set a shear strengthening area by increasing the density of the stirrups 140 or other means. While playing an adequate shear resistance role, it also takes into account the connection with other beam structures, streamlines the structure of the prestressed concrete secondary beam 100, and can improve the construction efficiency of the prestressed concrete secondary beam 100.

[0138] Optionally, the sizes of multiple stirrups 140 are the same, and they are arranged side by side at equal intervals. The prestressing tendon 170 and the steel bar 171 both pass through the multiple stirrups 140 arranged side by side and are in contact connection with the stirrups 140, so that the positions of the stirrups 140 and the prestressing tendon 170 restrict each other, and the stability of the prestressed concrete secondary beam 100 can be enhanced.

[0139] It can be understood that multiple stirrups 141 are also arranged at intervals in the web 13 section of the prestressed concrete secondary beam 110, that is, inside the main body part 110. At least one of the density, size, or structure of the stirrups 141 in the web 13 is different from that of the stirrups 140 in the end part 130.

[0140] In some possible embodiments, referring to Figures 9-10 , the side surface of the shear connector 120 is parallel to the side surface of the web 13.

[0141] The width of the side surface of the first part 121 gradually decreases in the direction close to the main body part 110.

[0142] In this embodiment, considering that the shear force of the prestressed concrete secondary beam 100 is smaller closer to the center, the width of the side surface of the first part 121 gradually decreases in the direction close to the main body part 110, so that the first part 121 is a variable cross-section structure, which can not only meet the shear resistance requirements but also play a role in reducing materials and weight.

[0143] Optionally, the shear connector 120 can pass through the end part 130 and extend into the inside of the web 13.

[0144] In some possible embodiments, referring to Figure 1 , Figure 2 and Figure 10 , the first part 121 has a first connection hole 1211 for the first fastener 150 to pass through and connect with the end part 130.

[0145] The second part 122 has a second connection hole 1221 for the second fastener 300 to pass through and connect with the main beam 200.

[0146] In this embodiment, the first part 121 has a first connection hole 1211 and can be connected to the main body part 110 through a first fastener 150, which can enhance the connection stability between the shear connector 120 and the main body part 110. The second part 122 has a second connection hole 1221 and can be connected to the main beam 200 through a second fastener 300 passing through it, providing multiple connection methods for the connection between the secondary beam and the main beam 200 and being applicable to various application scenarios.

[0147] Optionally, as Figure 9 shown, in the embodiment of the present application, the first fastener 150 is used to connect the first part 121 and the end part 130. The end part 130 is obtained by concrete pouring. The first fastener 150 is buried in the concrete, has a larger contact area with the concrete, and has stronger anchoring ability and connection ability, thereby enabling the shear connector 120 to have a stronger shear resistance effect.

[0148] It should be noted that the second fastener is used to connect with the metal components in the main beam 200, such as the embedded parts made of metal material set in the reserved groove 211 in the main beam 200, or the embedded connecting parts set on the side of the main beam, etc.

[0149] In some possible embodiments, please refer to Figure 9 、 Figure 11 or Figure 12 , the cross-section of the second part 122 is at least one of a straight shape, a C shape, a T shape, or an H shape.

[0150] In this embodiment, steel members with different shapes can be used as the shear connector 120 according to actual application scenarios and requirements, such as steel plates, C-shaped steel, T-shaped steel, or H-shaped steel, etc.

[0151] Optionally, the cross-section of the second part 122 is a C shape or a T shape.

[0152] The research and development idea of the present application includes: Channel steel is generally a standardized long steel with a groove-shaped cross-section, having standard shapes and size specifications, and is directly supplied after leaving the factory. Its thickness is relatively large and it is not convenient for re-design or direct application. However, the shear connector 120 of the prestressed concrete thin-web secondary beam in the present application needs to be adjusted or changed in shape and size according to actual requirements (such as performance requirements), resulting in that channel steel is also difficult to meet the adjustable and variable requirements.

[0153] This application uses C-shaped steel obtained through independent processing as the shear connector 120, which can be designed according to the required dimensions or performance, including design shapes, thickness and other dimensions, etc., with higher adaptability. The C-shaped steel is formed by cold bending of hot-rolled sheets, with thin walls, light self-weight, excellent cross-sectional performance, high strength, and can save 30% of materials with the same strength compared with traditional channel steels. Moreover, compared with channel steels, due to the difference in shape, the C-shaped steel has an inwardly recessed part at the opening, with stronger anti-deformation ability and better shear resistance.

[0154] This application can also use T-shaped steel obtained through independent processing as the shear connector 120, which can be freely designed in shape according to requirements, with higher adaptability compared with traditional steel plates; moreover, the T-shaped steel includes parts extending in two directions, and the overall stiffness in the two directions is greater than that of traditional steel plates, and the parts in the two directions support each other, with strong shear resistance.

[0155] In some possible embodiments, referring to Figures 1-19 , the prestressed concrete secondary beam 100 further includes: a embedded part 160.

[0156] The embedded part 160 is at least partially buried in the upper flange 11, and the top surface is exposed from the upper flange 11 for connecting with steel members.

[0157] In this embodiment, the exposed part of the embedded part 160 can be connected with other steel members to form a composite secondary beam or a composite beam. Among them, the steel members can include shear studs and other connectors that play a shear resistance role.

[0158] In some possible embodiments, referring to Figures 1-30 , the width of the end 130 is equal to the widths of both the upper flange 11 and the lower flange 12, and the side surface of the end 130 is flush with the side surfaces of both the upper flange 11 and the lower flange 12, and is flush with the side surfaces of the upper flange 11 and the lower flange 12.

[0159] In this embodiment, the upper and lower flanges 12 and the ends 130 at both ends enclose a rectangular structure, and the web 13 is located in the center, with regular and beautiful structure, which helps to maintain the stiffness of the overall structure and can be applied to the indoor floor.

[0160] In some possible embodiments, the steel bars passing through the web 13 are prestressing tendons.

[0161] In this embodiment, similar to the upper flange 11 and the lower flange 12, at least one prestressing tendon is passed through the web 13 along the length direction inside, further enhancing the crack resistance and bearing capacity of the prestressed concrete secondary beam 100.

[0162] Optionally, the steel bars passing through the web 13 can be at least one of prestressed steel bars, prestressed steel strands or prestressed steel wires.

[0163] In some possible embodiments, please refer to Figures 16-17 , the prestressed concrete secondary beam 100 further includes: at least one first stiffening rib 180, protruding from the side surface of the web 13 and connected to the upper flange 11 and the lower flange 12 at both ends respectively.

[0164] In this embodiment, the first stiffening rib 180 can enhance the stiffness of the web 13. Moreover, during the process of pouring concrete to form the prestressed concrete secondary beam 100, when the web 13 is relatively thin, the first stiffening rib 180 can facilitate the pouring and vibration of the concrete.

[0165] Considering that there are different design requirements, the present application also provides the following multiple implementation manners for the first stiffening rib 180: the cross-section of the first stiffening rib 180 includes at least one of a triangle, a trapezoid, a rectangle or a semi-circle.

[0166] In some possible embodiments, such as Figures 20-30 , the prestressed concrete secondary beam 100 further includes: anchor bars 101.

[0167] One end of the anchor bar 101 is fixed in the main body part 110, and the other end extends out of the top surface of the upper flange 11 for connecting with the steel bars or concrete in the later-poured superimposed layer.

[0168] In this embodiment, the anchor bar 101 extending out of the main body part 110 can form a composite secondary beam or a composite beam with other steel members or other concrete members. Optionally, such as Figure 24a , the anchor bar 101 can be formed by one end of the stirrup 141 extending out of the main body part 110.

[0169] Optionally, such as Figures 23a-24b , the top end of the anchor bar 101 can have barbs, which can improve the anchoring ability of the anchor bar 101.

[0170] Specifically, the barbs of the anchor bar 101 and the longitudinal steel bars corresponding to the later-poured floor slab and another part of the inverted steel bars are combined into a closed anchor bar.

[0171] Next, with reference to the drawings, specific structures of multiple prestressed concrete secondary beams 100 will be introduced by way of example.

[0172] Optionally, Figures 1-6 , Figures 8-10 shows an implementation manner of the first prestressed concrete secondary beam 100 of the embodiment of the present application, Figure 7 shows another implementation manner of the first prestressed concrete secondary beam 100 of the embodiment of the present application, Figures 11-12 shows two other implementation manners of the first prestressed concrete secondary beam of the embodiment of the present application.

[0173] Figure 1 , Figure 2, Figure 3 , Figure 4 , Figure 5 They are respectively the perspective structural schematic diagram, front view, top view, bottom view, and side view structural schematic diagrams of a first implementation manner of the prestressed concrete secondary beam 100 provided by the embodiments of the present application; Figure 6 , Figure 8 , Figure 9 They are respectively Figure 1 the sectional schematic diagrams at AA', BB', and CC' in Figure 7 For Figure 1 another sectional schematic diagram at AA' in Figure 10 For Figure 2 the perspective structural schematic diagram of the shear connector 120 in the main body portion 110 in Figure 10 For the convenience of understanding, in

[0174] In a first implementation manner of the first prestressed concrete secondary beam 100 of the embodiments of the present application, it includes a main body portion 110. The main body portion 110 includes an upper flange 11, a lower flange 12, and a web 13 provided therebetween. The upper flange 11 and the lower flange 12 have equal widths and flush sides, and the width of the web 13 is smaller than the widths of the upper flange 11 and the lower flange 12. At least one prestressed tendon 170 is disposed along the length direction inside the lower flange 12.

[0175] In a first implementation manner of the first prestressed concrete secondary beam of the embodiments of the present application, the prestressed concrete secondary beam 100 further includes: a shear connector 120 and end portions 130 provided at both ends of the main body portion 110. The first portion 121 of the shear connector 120 is inserted into the end portion 130. The second portion 122 of the shear connector 120 is exposed outside the end portion 130 for connecting with the main beam 200.

[0176] In a first implementation manner of the first prestressed concrete secondary beam of the embodiments of the present application, the first portion 121 has a first connection hole 1211 for the first fastener 150 to pass through and connect with the end portion 130. The second portion 122 has a second connection hole 1221 for the second fastener 300 to pass through and connect with the main beam 200.

[0177] In a first implementation manner of the first prestressed concrete secondary beam of the embodiments of the present application, the prestressed concrete secondary beam 100 further includes: a plurality of stirrups 140. The plurality of stirrups 140 are arranged at intervals inside the end portion 130. The stirrups 140 are perpendicular to the extending direction of the main body portion 110. The first portion 121 passes through an area surrounded or partially surrounded by at least one stirrup 140.

[0178] In a first implementation manner of the first prestressed concrete secondary beam of the embodiments of the present application, referring to Figure 5 and Figure 6, in the shear connector 120, the cross-section of the second part 122 is in a shape of a straight bar, that is, the second part 122 is in a plate shape.

[0179] Optionally, Figure 11 Another implementation manner of the first prestressed concrete secondary beam 100 according to the embodiment of the present application is shown. Here, the differences from the first implementation manner of the first prestressed concrete secondary beam 100 are mainly introduced. Please refer to Figure 11 , in another implementation manner of the first prestressed concrete secondary beam 100 according to the embodiment of the present application, the cross-section of the shear connector 120 is in a groove shape.

[0180] The other structures of another implementation manner of the first prestressed concrete secondary beam 100 according to the embodiment of the present application are the same as or similar to those of the first implementation manner of the first prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be described in detail here.

[0181] Optionally, Figure 12 Another implementation manner of the first prestressed concrete secondary beam 100 according to the embodiment of the present application is shown. Here, the differences from the first implementation manner of the first prestressed concrete secondary beam 100 are mainly introduced. Please refer to Figure 12 , in another implementation manner of the first prestressed concrete secondary beam 100 according to the embodiment of the present application, the cross-section of the shear connector 120 is in an H shape.

[0182] The other structures of another implementation manner of the first prestressed concrete secondary beam 100 according to the embodiment of the present application are the same as or similar to those of the first implementation manner of the first prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be described in detail here.

[0183] Optionally, Figures 10-11 An implementation manner of the second prestressed concrete secondary beam 100 according to the embodiment of the present application is shown, which are respectively the front view structural schematic diagram and the axonometric structural schematic diagram of the second prestressed concrete secondary beam 100 provided by the embodiment of the present application. Here, the differences from an implementation manner of the first prestressed concrete secondary beam 100 are mainly introduced.

[0184] Optionally, Figure 13 and Figure 14 The second prestressed concrete secondary beam 100 according to the embodiment of the present application is shown, which are respectively the three-dimensional structural schematic diagram and the front view structural schematic diagram of the second prestressed concrete secondary beam 100 provided by the embodiment of the present application. Here, the differences from an implementation manner of the first prestressed concrete secondary beam 100 are mainly introduced.

[0185] Please refer to Figure 13 and Figure 14, in the second prestressed concrete secondary beam 100 of the embodiment of the present application, holes 131 are provided on the web 13. The web 13 is located at the neutral axis and is subject to relatively less force. A plurality of holes 131 are provided on the web 13, and the shapes of the holes 131 may include circles, squares, rectangles, polygons, etc., which can enable pipelines to pass through and at the same time reduce the weight of the prestressed concrete secondary beam 100.

[0186] The other structures of the second prestressed concrete secondary beam 100 of the embodiment of the present application are the same as or similar to those of the first prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be elaborated here.

[0187] Optionally, Figure 15 Figure 3 shows the third prestressed concrete secondary beam 100 of the embodiment of the present application. The differences from an embodiment of the first prestressed concrete secondary beam 100 are mainly introduced here.

[0188] Please refer to Figure 15 , in the third prestressed concrete secondary beam 100 of the embodiment of the present application, the sizes and positions of the embedded parts 160 are different and can be designed according to requirements.

[0189] The other structures of the third prestressed concrete secondary beam 100 of the embodiment of the present application are the same as or similar to those of the first prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be elaborated here.

[0190] Optionally, Figure 16 and Figure 17 Figures 4 and 5 show the fourth prestressed concrete secondary beam 100 of the embodiment of the present application, which are respectively the three-dimensional structural schematic diagram and the front view structural schematic diagram of the fourth prestressed concrete secondary beam 100 provided by the embodiment of the present application. The differences from an embodiment of the first prestressed concrete secondary beam 100 are mainly introduced here.

[0191] Please refer to Figure 16 and Figure 17 , in the fourth prestressed concrete secondary beam 100 of the embodiment of the present application, it further includes: at least one first stiffening rib 180, protruding from the side surface of the web 13 and connected to the upper flange 11 and the lower flange 12 at both ends.

[0192] The other structures of the fourth prestressed concrete secondary beam 100 of the embodiment of the present application are the same as or similar to those of the first prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be elaborated here.

[0193] Optionally, Figure 18 and Figure 19 Figures 6 and 7 show the fifth prestressed concrete secondary beam 100 of the embodiment of the present application, which are respectively the three-dimensional structural schematic diagram and the front view structural schematic diagram of the fifth prestressed concrete secondary beam 100 provided by the embodiment of the present application. The differences from an embodiment of the first prestressed concrete secondary beam 100 are mainly introduced here.

[0194] Please refer to Figure 18 and Figure 19 In the fifth prestressed concrete secondary beam 100 of the embodiment of the present application, the position of the hole 131 opened on the web 13 avoids the first stiffener 180, stirrups 140 or the steel bars inside the web 13, reducing the possibility of the load-bearing capacity of the web 13 being reduced due to the opening of the hole 131.

[0195] The other structures of the fifth prestressed concrete secondary beam 100 of the embodiment of the present application are the same as or similar to those of the first prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be described in detail here.

[0196] Optionally, Figure 20 、 Figure 21 、 Figure 22 and Figure 23a respectively show the three-dimensional structure schematic diagram, front view, top view and side view structure schematic diagram of the sixth prestressed concrete secondary beam 100 of the embodiment of the present application; Figure 23b and Figure 23c show two other possible side view structure schematic diagrams of the sixth prestressed concrete secondary beam 100; Figure 24a shows the cross-sectional schematic diagram of the sixth prestressed concrete secondary beam 100 of the embodiment of the present application at DD', Figure 24b shows another possible cross-sectional schematic diagram of the sixth prestressed concrete secondary beam 100 of the embodiment of the present application at DD'. Here, the differences from an implementation manner of the first prestressed concrete secondary beam 100 are mainly introduced.

[0197] In the sixth prestressed concrete secondary beam 100 of the embodiment of the present application, the prestressed concrete secondary beam 100 further includes: anchor bars 101. One end of the anchor bars 101 is fixed inside the main body portion 110, and the other end extends out of the top surface of the upper flange 11 for connecting with steel members or concrete members. Among them, the top end of the anchor bars 101 is in a barbed shape.

[0198] Optionally, Figure 23b shows another possible side view structure schematic diagram of the sixth prestressed concrete secondary beam 100. Compared with an implementation manner shown in the sixth prestressed concrete secondary beam 100 Figure 23a in the horizontal plane, along the direction perpendicular to the extending direction of the main body portion 110, the distance between the anchor bars 101 is shorter, and the corresponding cross-sectional schematic diagram can be referred to Figure 24b .

[0199] Optionally, Figure 23c shows another possible side view structure schematic diagram of the sixth prestressed concrete secondary beam 100, in which, compared with an implementation manner shown in the sixth prestressed concrete secondary beam 100 Figure 23a the number of the anchor bars 101 is smaller.

[0200] For other structures of the sixth prestressed concrete secondary beam 100 in the embodiments of the present application, they are the same as or similar to an implementation manner of the first prestressed concrete secondary beam 100 in the embodiments of the present application, and will not be described in detail here.

[0201] Optionally, Figures 25-26 The perspective structure diagram and the front view structure diagram of the seventh prestressed concrete secondary beam 100 in the embodiments of the present application are shown; the seventh prestressed concrete secondary beam 100 in the embodiments of the present application is based on the sixth prestressed concrete secondary beam 100, and holes 131 are provided on the web 13. The web 13 is located at the neutral axis and is relatively less stressed. A plurality of holes 131 are provided on the web 13, and the shapes of the holes 131 may include circles, squares, rectangles, polygons, etc., which can enable pipelines to pass through and reduce the weight of the prestressed concrete secondary beam 100 at the same time.

[0202] For other structures of the seventh prestressed concrete secondary beam 100 in the embodiments of the present application, they are the same as those of the sixth prestressed concrete secondary beam 100 in the embodiments of the present application, and will not be described in detail here.

[0203] Optionally, Figures 27-28 The perspective structure diagram and the front view structure diagram of the eighth prestressed concrete secondary beam 100 in the embodiments of the present application are shown; the eighth prestressed concrete secondary beam 100 in the embodiments of the present application, based on the sixth prestressed concrete secondary beam 100, further includes: at least one first stiffening rib 180, protruding from the side surface of the web 13, and the two ends are respectively connected to the upper flange 11 and the lower flange 12.

[0204] For other structures of the eighth prestressed concrete secondary beam 100 in the embodiments of the present application, they are the same as those of the sixth prestressed concrete secondary beam 100 in the embodiments of the present application, and will not be described in detail here.

[0205] Figures 29-30 The perspective structure diagram and the front view structure diagram of the ninth prestressed concrete secondary beam 100 in the embodiments of the present application are shown; the eighth prestressed concrete secondary beam 100 in the embodiments of the present application is based on the sixth prestressed concrete secondary beam 100, holes 131 are provided on the web 13, and at least one first stiffening rib 180 is provided, protruding from the side surface of the web 13, and the two ends are respectively connected to the upper flange 11 and the lower flange 12. The positions of the holes 131 on the web 13 avoid the first stiffening rib 180, the stirrup 140 or the steel bars inside the web 13, reducing the possibility of the bearing capacity of the web 13 being reduced due to the opening of the holes 131.

[0206] For other structures of the ninth prestressed concrete secondary beam 100 in the embodiments of the present application, they are the same as or similar to those of the sixth prestressed concrete secondary beam 100 in the embodiments of the present application, and will not be described in detail here.

[0207] Optionally, Figure 31, Figure 32 , Figure 33 and Figure 34 are respectively a perspective structural schematic diagram, a front view, a top view, and a side view structural schematic diagram of the tenth prestressed concrete secondary beam 100 of the embodiment of the present application. The differences from an implementation manner of the first prestressed concrete secondary beam 100 will be mainly introduced here.

[0208] In the tenth prestressed concrete secondary beam 100 of the embodiment of the present application, a convex portion 102 is provided at the outer top end of the end portion 130 of the prestressed concrete secondary beam 100. The top of the reserved groove 211 of the concrete main beam 210 is open. The convex portion 102 is placed in the reserved groove 211.

[0209] The other structures of the tenth prestressed concrete secondary beam 100 of the embodiment of the present application are the same as or similar to an implementation manner of the first prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be elaborated here.

[0210] Optionally, Figures 35-36 shows a perspective structural schematic diagram and a front view structural schematic diagram of the eleventh prestressed concrete secondary beam 100 of the embodiment of the present application. The eleventh prestressed concrete secondary beam 100 of the embodiment of the present application is based on the tenth prestressed concrete secondary beam 100, and holes 131 are provided in the web 13. The web 13 is located at the neutral axis and is subject to relatively less force. A plurality of holes 131 are provided in the web 13, and the shapes of the holes 131 may include circles, squares, rectangles, polygons, etc., which can enable pipelines to pass through and at the same time reduce the weight of the prestressed concrete secondary beam 100.

[0211] The other structures of the eleventh prestressed concrete secondary beam 100 of the embodiment of the present application are the same as those of the tenth prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be elaborated here.

[0212] Figures 37-38 shows a perspective structural schematic diagram and a front view structural schematic diagram of the twelfth prestressed concrete secondary beam 100 of the embodiment of the present application. In the twelfth prestressed concrete secondary beam 100 of the embodiment of the present application, based on the tenth prestressed concrete secondary beam 100, at least one first stiffening rib 180 is provided on the web 13, protruding from the side of the web 13 and connected to the upper flange 11 and the lower flange 12 at both ends respectively.

[0213] The other structures of the twelfth prestressed concrete secondary beam 100 of the embodiment of the present application are the same as those of the tenth prestressed concrete secondary beam 100 of the embodiment of the present application, and will not be elaborated here.

[0214] Figures 39-40The three-dimensional structure schematic diagram and the front view structure schematic diagram of the thirteenth prestressed concrete secondary beam 100 according to the embodiment of the present application are shown; the thirteenth prestressed concrete secondary beam 100 according to the embodiment of the present application is based on the tenth prestressed concrete secondary beam 100, and a hole 131 is opened on the web 13, and at least one first stiffening rib 180 is provided, protruding from the side surface of the web 13 and connected to the upper flange 11 and the lower flange 12 at both ends respectively. The position of the hole 131 opened on the web 13 avoids the first stiffening rib 180, the stirrup 140 or the steel bars inside the web 13, reducing the possibility of the bearing capacity of the web 13 being reduced due to the opening of the hole 131. The other structures of the thirteenth prestressed concrete secondary beam 100 according to the embodiment of the present application are the same as or similar to those of the tenth prestressed concrete secondary beam 100 according to the embodiment of the present application, and will not be elaborated here.

[0215] Optionally, Figure 41 , Figure 42 The three-dimensional structure schematic diagrams of the fourteenth and fifteenth prestressed concrete secondary beams 100 according to the embodiment of the present application are shown. Here, the differences from the prestressed concrete secondary beam 100 in the foregoing embodiment will be mainly introduced.

[0216] In the fourteenth and fifteenth prestressed concrete secondary beams 100 according to the embodiment of the present application, different from the foregoing embodiment, the anchor bars 101 of the prestressed concrete secondary beam 100 are straight.

[0217] The other structures of the fourteenth and fifteenth prestressed concrete secondary beams 100 according to the embodiment of the present application are the same as or similar to an implementation manner of the first prestressed concrete secondary beam 100 according to the embodiment of the present application, and will not be elaborated here.

[0218] In the related art, the main beam and the secondary beam form a plane frame, and the plane frame includes a steel frame, a concrete frame or a steel-concrete composite frame. In the steel frame, H-shaped steel is often used as the steel secondary beam, but the cost is high and the fire and corrosion resistance are poor. Some use solid-web concrete secondary beams, but they have a large self-weight, are inconvenient for construction, and have poor crack resistance.

[0219] Based on the same inventive concept, as Figure 43 , Figure 49 shown, the embodiment of the present application provides a frame structure, which is applied to the structure inside a building and includes: main beams 200 arranged along at least two directions, and any one of the prestressed concrete secondary beams 100 provided in the foregoing embodiment.

[0220] A plurality of main beams 200 enclose and are connected to columns 400.

[0221] The shear connectors 120 of the prestressed concrete secondary beam 100 are connected to the main beam 200.

[0222] In this embodiment, the bottoms of multiple main beams 200 are all connected to the columns 400, and the columns 400 play a supporting role. The prestressed concrete secondary beams 100 are connected between the main beams 200, and the shear connectors 120 play a role in connecting with the main beams 200. The frame structure provided in this embodiment includes any one of the prestressed concrete secondary beams 100 provided in the above embodiments, and its implementation principle is similar, which will not be elaborated here.

[0223] In some possible embodiments, please refer to Figures 43-47 , the main beam 200 includes: a concrete main beam 210.

[0224] The concrete main beam 210 has a reserved groove 211.

[0225] The second part 122 of the shear connector 120 of the prestressed concrete secondary beam 100 is placed in the reserved groove 211.

[0226] In this embodiment, the main beam 200 can be the concrete main beam 210. The concrete main beam 210 has a reserved groove 211 during the pouring process. The shear connector 120 of the prestressed concrete secondary beam 100 can be inserted into the reserved groove 211 to realize the connection between the prestressed concrete secondary beam 100 and the concrete main beam 210. The reserved groove 211 has a certain width, so there is a certain adjustable space, which is convenient for position adjustment when the shear connector 120 is inserted into the reserved groove 211. Moreover, after the shear connector 120 is inserted into the reserved groove 211, concrete can be poured to fix the shear connector 120 and the concrete main beam 210.

[0227] And before pouring the concrete, the specific position of the shear connector 120 in the reserved groove 211 can also be temporarily fixed by positioning blocks such as wedges to prevent the shear connector 120 from shifting during the subsequent concrete pouring process.

[0228] Optionally, referring to Figure 46 and Figure 47 , the reserved groove 211 can be filled with high-strength concrete 212 (such as with a grade of C40 or above) to enhance the connection stability between the main beam 200 and the shear connector 120.

[0229] In some possible embodiments, the frame structure further includes: a second fastener 300.

[0230] The second fastener 300 passes through the second connection hole 1221 of the shear connector 120 and is connected to the embedded part in the reserved groove 211 of the concrete main beam 210.

[0231] In this embodiment, the shear connector 120 is tightly connected to the embedded part in the reserved groove 211 of the concrete main beam 210 by using the second fastener 300, further enhancing the connection stability between the main beam 200 and the shear connector 120.

[0232] In some possible embodiments, the main beam 200 includes: a concrete main beam 210.

[0233] The side of the concrete main beam 210 is provided with embedded connectors.

[0234] The second part 122 of the shear connector 120 is attached to the embedded connector on the side of the concrete main beam 210 and is connected by a second fastener 300.

[0235] In this embodiment, the side of the concrete main beam 210 can also be provided with embedded connectors made of metal material. The second part 122 of the shear connector 120 can be attached to the embedded connector on the side of the concrete main beam 210 and is connected by a second fastener 300, further enhancing the connection stability between the main beam 200 and the shear connector 120. In some possible embodiments, please refer to Figures 49-51 , the prestressed concrete secondary beam 100 and the main beam 200 include: a steel main beam 220.

[0236] The side of the steel main beam 220 is provided with a second stiffening rib 221.

[0237] The second part 122 of the shear connector 120 is attached to the second stiffening rib 221 and is connected by a second fastener 300.

[0238] In this embodiment, the main beam 200 can be the steel main beam 220. The side of the steel main beam 220 is provided with a second stiffening rib 221. The second part 122 of the shear connector 120 is attached to and firmly connected to the second stiffening rib 221, and there is no need to use concrete materials for reinforcement. Due to its own material, the steel main beam 220 is easier to drill holes. Connecting the steel main beam 220 and the prestressed concrete secondary beam 100 through the second fastener 300 has a higher connection accuracy, smaller and controllable errors, and is easy to implement, which can improve the construction efficiency.

[0239] All in all, the present application can select a suitable connection method according to the material of the main beam, with flexible operation and wider application.

[0240] Optionally, the steel main beam 220 is an H-shaped steel. The second stiffening rib 221 is arranged on the side of the H-shaped steel web, and the second stiffening rib 221 is perpendicular to the steel main beam 220.

[0241] In some possible embodiments, the frame structure further includes: a floor slab.

[0242] The floor slab is arranged on the top of the frame structure.

[0243] The prestressed concrete secondary beam 100 is at least partially overlapped and connected with the floor slab.

[0244] In this embodiment, the embedded part 160 is a steel member, and a connecting member is welded on it, enabling the prestressed concrete secondary beam 100 to be superposed with the floor slab. The superposition forms a compression zone, enhancing the stiffness and stability of the prestressed concrete secondary beam 100 and the floor slab, and enhancing the overall stability of the frame structure.

[0245] In some possible embodiments, please refer to Figures 31-34 and Figure 48 , a convex part 102 is provided at the outer top end of the end part 130 of the prestressed concrete secondary beam 100.

[0246] The top of the reserved slot 211 of the concrete main beam 210 is open.

[0247] The convex part 102 is placed in the reserved slot 211.

[0248] In this embodiment, the end part 130 of the prestressed concrete secondary beam 100 has a convex part 102, which can be directly placed on the concrete main beam 210, making the connection between the concrete main beam 210 and the prestressed concrete secondary beam 100 more convenient.

[0249] Next, with reference to the accompanying drawings, specific structures of various frame structures will be introduced by way of example.

[0250] Optionally, Figures 43-47 shows an implementation manner of the first frame structure provided by the embodiment of the present application. Figure 43 shows the structural schematic diagram of the first frame structure provided by the embodiment of the present application; Figure 44 is Figure 43 the partial enlarged schematic diagram at position E in Figure 45 is the side view structural schematic diagram of the connection between the main beam and the prestressed concrete secondary beam in an implementation manner of the first frame structure provided by the embodiment of the present application (omitting the concrete poured in the reserved slot 211 or before pouring the concrete); Figure 46 is Figure 45 the cross-sectional schematic diagram at position FF' in Figure 47 after pouring the concrete in the reserved slot 211 in an implementation manner of the first frame structure provided by the embodiment of the present application;

[0251] The first frame structure provided by the embodiment of the present application includes: a plurality of main beams 200, and any one of the prestressed concrete secondary beams 100 provided in the above embodiments. The plurality of main beams 200 enclose and are connected to the columns 400. The shear connectors 120 of the prestressed concrete secondary beam 100 are connected to the main beams 200.

[0252] The main beam 200 includes: a concrete main beam 210. The concrete main beam 210 has a reserved slot 211. The second part 122 of the shear connector 120 of the prestressed concrete secondary beam 100 is placed in the reserved slot 211.

[0253] The frame structure further includes: a second fastener 300 (not shown in the figure). The second fastener 300 passes through the second connection hole 1221 of the shear connector 120 and is connected to the embedded part in the reserved groove 211 of the concrete main beam 210.

[0254] Optionally, the main beam 200 includes: a concrete main beam 210. The side of the concrete main beam 210 is provided with an embedded connecting part. The second part 122 of the shear connector 120 is attached to the embedded connecting part on the side of the concrete main beam 210 and is connected by the second fastener 300.

[0255] In an implementation manner of the first frame structure provided by the embodiment of the present application, it includes any one of the prestressed concrete secondary beams 100 provided by the above embodiment, and its implementation principle is similar, so it will not be elaborated here.

[0256] Optionally, Figure 48 Another implementation manner of the first frame structure provided by the embodiment of the present application is shown; Figure 48 It is a schematic side view structure of the connection between the main beam and the prestressed concrete secondary beam in another implementation manner of the first frame structure provided by the embodiment of the present application.

[0257] In another implementation manner of the first frame structure provided by the embodiment of the present application, any one of the prestressed concrete secondary beams 100 from the tenth to the fourteenth prestressed concrete secondary beams 100 provided by the embodiment of the present application is adopted. A convex part 102 is provided at the outer top end of the end part 130 of the prestressed concrete secondary beam 100; the top of the reserved groove 211 of the concrete main beam 210 is open; the convex part 102 is placed in the reserved groove 211. The other structures of another implementation manner of the first frame structure provided by the embodiment of the present application are the same as or similar to those of an implementation manner of the first frame structure of the embodiment of the present application, so they will not be elaborated here.

[0258] Optionally, Figures 49-51 An implementation manner of the second frame structure provided by the embodiment of the present application is shown. Figure 49 It is a schematic structure diagram of the second frame structure provided by the embodiment of the present application; Figure 50 It is a schematic side view structure of the connection between the main beam 200 and the prestressed concrete secondary beam 100 in the second frame structure provided by the embodiment of the present application (with the second stiffening rib 221 and the second fastener 300 omitted, or before installing the second stiffening rib 221 and the second fastener 300); Figure 51 It is a schematic top view structure of the connection between the main beam 200 and the prestressed concrete secondary beam 100 in the second frame structure provided by the embodiment of the present application.

[0259] In an implementation manner of the second frame structure provided by the embodiments of the present application, the prestressed concrete secondary beam 100 and the main beam 200 include: a steel main beam 220. A second stiffening rib 221 is arranged on the side of the steel main beam 220. The second part 122 of the shear connector 120 is attached to the second stiffening rib 221 and connected by a second fastener 300.

[0260] In an implementation manner of the second frame structure provided by the embodiments of the present application, it includes any one of the prestressed concrete secondary beams 100 provided by the above embodiments, and its implementation principle is similar, which will not be elaborated here.

[0261] Applying the embodiments of the present application can at least achieve the following beneficial effects:

[0262] 1. In the embodiments of the present application, the widths of the upper flange 11 and the lower flange 12 are equal and their sides are flush, making the overall shape of the main body 110 relatively regular, which helps to maintain the stiffness of the overall structure, reduce the stiffness mismatch or imbalance problems caused by irregular shapes, and the appearance is also neater. Moreover, prestressing tendons 170 are arranged in the lower flange 12, which can enhance the crack resistance and load-bearing capacity of the prestressed concrete secondary beam 100.

[0263] 2. In the embodiments of the present application, the shear connector 120 has a certain rigidity and is arranged at the end 130 of the prestressed concrete secondary beam 100, with a certain shear resistance ability, which can replace the solutions of increasing the density of stirrups 140, increasing the diameter of stirrups 140 or configuring bent-up bars in the related art to increase the shear strengthening area, can reduce the amount of stirrups 140 used, and reduce the material cost. Moreover, the shear connector 120 plays the roles of shear resistance and connection at the same time, can reduce the construction difficulty of the prestressed concrete secondary beam 100, and the exposed second part 122 of the shear connector 120 is also convenient for maintenance.

[0264] 3. In the embodiments of the present application, the first part 121 of the shear connector 120 passes through the area enclosed or partially enclosed by at least one stirrup 140, and the shear connector 120 and the stirrups 140 in the end 130 form a shear strengthening area. There is no need to additionally set a shear strengthening area by increasing the density of stirrups 140 or other means. While playing an adequate shear resistance role, it also takes into account the role of connecting with other beam structures, simplifies the structure of the prestressed concrete secondary beam 100, and can improve the construction efficiency of the prestressed concrete secondary beam 100.

[0265] 4. Considering that the shear force of the prestressed concrete secondary beam 100 is smaller closer to the center, the width of the side of the first part 121 gradually decreases along the direction close to the main body 110, so that the first part 121 is a variable cross-section structure, which can play the role of reducing materials and weight.

[0266] 5. The first part 121 has a first connection hole 1211, which can be connected to the main body part 110 through the first fastener 150, and can enhance the connection stability between the shear-resistant connector 120 and the main body part 110. The second part 122 has a second connection hole 1221, which can be passed through by the second fastener 300 and connected to the main beam 200, providing multiple connection methods for the connection between the secondary beam and the main beam 200, and can be applied to a variety of application scenarios.

[0267] The terms "first" and "second" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance or implicitly specifying the quantity of the indicated technical features. Thus, features defined with "first" and "second" may explicitly or implicitly include one or more of such features. In the description of the present application, unless otherwise specified, the meaning of "a plurality" is two or more.

[0268] The above are only some embodiments of the present application. It should be noted that for those of ordinary skill in the art, without departing from the technical concept of the solution of the present application, other similar implementation means based on the technical idea of the present application also belong to the protection scope of the embodiments of the present application.

Claims

1. A prestressed concrete secondary beam, characterized in that: include: Main body; The main body comprises an upper flange, a lower flange and a web disposed therebetween; The upper flange and the lower flange have equal widths and flush sides, and the width of the web is smaller than the width of the upper flange and the lower flange; At least one prestressed tendon is provided in the lower flange along the length direction.

2. The prestressed concrete secondary beam according to claim 1, characterized in that: Also includes: A shear-resistant connector and end portions disposed at both ends of the main body; The first portion of the shear connector is inserted into the end portion; The second portion of the shear connector is exposed at the end portion and is used for connection with the main beam.

3. The prestressed concrete secondary beam according to claim 2, characterized in that: Also includes: A plurality of stirrups are arranged at intervals in the end portion; the stirrups are perpendicular to the extension direction of the main body; The first portion passes through an area enclosed or partially enclosed by at least one stirrup.

4. The prestressed concrete secondary beam according to claim 2, characterized in that: The side surface of the shear connector is parallel to the side surface of the web; The width of the side surface of the first portion gradually decreases in a direction approaching the main body portion.

5. The prestressed concrete secondary beam according to claim 2, characterized in that: The first portion has a first connecting hole for a first fastener to pass through and connect to the end portion; The second portion has a second connecting hole for a second fastener to pass through and connect with the main beam.

6. The prestressed concrete secondary beam according to claim 2, characterized in that: The cross section of the second portion is at least one of a straight line shape, a C shape, a T shape or an H shape.

7. The prestressed concrete secondary beam according to claim 2, characterized in that: Also includes: Embedded parts; The embedded part is at least partially embedded in the upper flange, with the top surface exposed from the upper flange, and is used for connection with the steel member.

8. The prestressed concrete secondary beam according to claim 2, characterized in that: The width of the end portion is equal to the width of the upper flange and the lower flange, and the side surface of the end portion is flush with the side surfaces of the upper flange and the lower flange.

9. The prestressed concrete secondary beam according to claim 2, characterized in that: At least one steel bar is passed through the web along the length direction.

10. The prestressed concrete secondary beam according to claim 2, characterized in that: The prestressed concrete secondary beam also includes: at least one first stiffening rib protruding from the side of the web, with two ends respectively connected to the upper flange and the lower flange and flush with the side of the upper flange and the lower flange.

11. The prestressed concrete secondary beam according to claim 10, characterized in that: The cross section of the first stiffening rib includes at least one of a triangle, a trapezoid, a rectangle or a semicircle.

12. The prestressed concrete secondary beam according to claim 2, characterized in that: Also includes: Anchor bars; One end of the anchor bar is fixed in the main body, and the other end extends out of the top surface of the upper flange, so as to be connected with the steel bars or concrete in the later cast superimposed layer.

13. A frame structure, characterized in that: A structure used inside a building, comprising: a main beam arranged in at least two directions, and a prestressed concrete secondary beam as claimed in any one of claims 2 to 12; A plurality of said main beams are enclosed and connected to the columns; The shear connector of the prestressed concrete secondary beam is connected to the main beam.

14. The frame structure according to claim 13, characterized in that: The main beam comprises: a concrete main beam; The concrete main beam has a reserved groove; The second part of the shear connector of the prestressed concrete secondary beam is placed in the reserved groove.

15. The frame structure according to claim 14, characterized in that: Also includes: a second fastener; The second fastener passes through the second connection hole of the shear connector and is connected to the embedded part in the reserved groove of the concrete main beam.

16. The frame structure according to claim 13, characterized in that: The main beam comprises: a concrete main beam; The side of the concrete main beam is provided with embedded connecting parts; The second part of the shear-resistant connector is attached to the embedded connector on the side of the concrete main beam and connected by a second fastener.

17. The frame structure according to claim 13, characterized in that: The main beam comprises: a steel main beam; The side of the steel main beam is provided with a second stiffening rib; The second portion of the shear connector and the second stiffening rib are in contact and connected via a second fastener.

18. The frame structure according to claim 13, characterized in that: Also includes: Floor slab; The floor slab is arranged on the top of the frame structure; The prestressed concrete secondary beam is at least partially overlapped and connected to the floor slab.

19. The frame structure according to claim 14, characterized in that: A convex portion is provided at the outer top end of the end portion of the prestressed concrete secondary beam; The top of the reserved groove of the concrete main beam is open; The convex portion is arranged in the reserved groove.

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