Fabricated square steel tube confined concrete column beam joint

Abstract

The invention relates to the technical field of constructional engineering, and discloses a fabricated square steel tube confined concrete column beam joint which comprises an upper steel column tube, a lower steel column tube and a connecting mechanism arranged between the upper steel column tube and the lower steel column tube. A plurality of splicing pieces in the connecting mechanism are arranged at equal intervals in the circumferential direction, and first assembling holes are formed in the splicing pieces; the multiple reinforcing ribs and the multiple splicing pieces are arranged in a one-to-one staggered and overlapped mode to define the core tube, and the reinforcing ribs are connected with the two adjacent splicing pieces. The multiple connecting pieces correspond to the multiple splicing pieces one to one and are rotationally connected with the first assembly holes, multiple buckling-restrained energy dissipation elements are arranged between the connecting pieces and the splicing pieces, and the sides, away from the splicing pieces, of the connecting pieces are connected with precast beams; the outer frame mechanism wraps the core tube, the outer frame mechanism is connected with the splicing pieces, the joint rigidity can be large, the bearing capacity is high, the shear resistance is high, and meanwhile the problems that due to the shear resistance problem, stirrups are too large, and construction of a joint area is inconvenient are solved.

Description

Technical Field

[0001] The present invention relates to the technical field of construction engineering, and particularly to a prefabricated square steel tube confined concrete column-beam joint. Background Art

[0002] In recent years, the prefabricated buildings and building industrialization in China have developed rapidly. As a new type of prefabricated structural system, the steel tube confined concrete structure has emerged accordingly. This system has good mechanical properties and good economy, and thus has been more and more widely used.

[0003] The joint is a key component of the building frame structure. Especially after the structure enters the elastoplastic stage under strong earthquakes, the joint plays a key role in the integrity and stability of the structure. At the position where the shear force and bending moment are the largest under earthquake action, the failure of the joint may cause the collapse of the structural building in severe cases. Therefore, how to connect the reinforced concrete beam and the concrete-filled steel tube column, how to reinforce between the joints, and how to ensure the simplicity and reliability of joint construction have become the focus of the research on the concrete-filled steel tube structure system at present; and conducting in-depth research on the structure and seismic performance of the concrete-filled steel tube column-reinforced concrete beam joint, and proposing a safe, reliable and easy-to-construct joint form and its design method are important ways to promote the wide application of the concrete-filled steel tube structure in engineering.

[0004] At present, in the existing concrete-filled steel tube structure, a hoop joint or a semi-penetrating joint is adopted in the core area of the concrete-filled steel tube column-reinforced concrete beam. The former has a large diameter of the column stirrup in the core area, and the latter has a small opening, both of which lead to difficulties in passing the longitudinal beam reinforcement, and the construction operation surface is small, and it is difficult to bind the steel bars and pour the concrete in the core area, etc. Summary of the Invention

[0005] The purpose of the present invention is to provide a prefabricated square steel tube confined concrete column-beam joint, aiming to solve or improve at least one of the above technical problems.

[0006] To achieve the above purpose, the present invention provides the following solution: The present invention provides a prefabricated square steel tube confined concrete column-beam joint, including an upper steel column tube, a lower steel column tube, and a connecting mechanism arranged between the upper steel column tube and the lower steel column tube. The upper steel column tube, the lower steel column tube, and the connecting mechanism are cast into one body by concrete;

[0007] The connecting mechanism includes:

[0008] A plurality of splicing pieces, arranged at equal intervals in the circumferential direction, and the splicing pieces are provided with first assembly holes;

[0009] A plurality of stiffening ribs, overlapping with the plurality of splicing pieces one by one in an alternating manner to form a core tube, and the stiffening ribs are connected to two adjacent splicing pieces;

[0010] A plurality of connecting members, corresponding to the plurality of splicing members one by one and rotatably connected to the first assembly holes, a plurality of buckling restraint energy dissipation elements are arranged between the connecting members and the splicing members, and a precast beam is connected to the side of the connecting member away from the splicing member;

[0011] An outer frame mechanism, covering the core tube, and the outer frame mechanism is connected to the splicing member.

[0012] Optionally, the splicing member includes:

[0013] An internal reinforcing steel plate, provided with a plurality of second assembly holes for connecting with the stiffening ribs, and the internal reinforcing steel plate is connected to the buckling restraint energy dissipation element;

[0014] An external web, connected to the internal reinforcing steel plate, and the first assembly hole is provided on the external web.

[0015] Optionally, the stiffening rib includes:

[0016] A connecting web;

[0017] A pair of first wing plates, obliquely arranged on both sides of the connecting web, a plurality of third assembly holes are provided on the first wing plates, and the pair of first wing plates are respectively connected to the adjacent two internal reinforcing steel plates through the plurality of third assembly holes and the plurality of second assembly holes by bolts and nuts.

[0018] Optionally, the connecting member includes:

[0019] A fixed steel plate, connected to the precast beam and the buckling restraint energy dissipation element;

[0020] A pair of second wing plates, connected to the fixed steel plate, a fourth assembly hole is provided on the second wing plate, the external web is located between the pair of second wing plates, and the first assembly hole and the pair of fourth assembly holes are rotatably connected through a pin shaft.

[0021] Optionally, a circular friction plate sleeved on the pin shaft is arranged between the second wing plate and the external web.

[0022] Optionally, the outer frame mechanism includes:

[0023] A frame body;

[0024] A plurality of outer steel plates, circumferentially arranged on the frame body, a fifth assembly hole is provided on the outer steel plate, and the fifth assembly hole is connected to the second assembly hole and the third assembly hole by bolts and nuts.

[0025] Optionally, a loop-shaped slot is formed in the frame body, the outer steel plate has a right-angle structure, and a plurality of the outer steel plates are inserted into the loop-shaped slot.

[0026] Optionally, first notch grooves are respectively formed in end faces of two adjacent outer steel plates close to each other, and a first avoidance hole is formed by the two adjacent first notch grooves, and the buckling-restrained energy dissipation element passes through the first avoidance hole.

[0027] Optionally, second notch grooves are respectively formed in end faces of two adjacent outer steel plates close to each other, and a second avoidance hole is formed by the two adjacent second notch grooves, and the external web passes through the second avoidance hole.

[0028] Optionally, the buckling-restrained energy dissipation element includes:

[0029] A connecting steel plate, with two ends respectively connected to the splicing member and the connecting member, and a plurality of through grooves are formed in the connecting steel plate;

[0030] A constraint shell, which is wrapped on the connecting steel plate, and a plurality of constraint bars are fixedly connected to the constraint shell, and the plurality of constraint bars are respectively located in the plurality of through grooves.

[0031] The present invention discloses the following technical effects:

[0032] 1. A core tube is formed by overlapping a plurality of splicing members and a plurality of stiffening ribs in a staggered manner, enhancing the constraint effect of the joint part on the concrete. This not only enhances the bearing capacity of the concrete, but also enables the core tube part and the concrete to work better together. This structure has a large joint stiffness, high bearing capacity, and strong shear resistance, and at the same time solves the problems of excessive stirrups and inconvenient construction in the joint area caused by shear problems.

[0033] 2. The upper column steel pipe, the lower column steel pipe, the splicing member, the stiffening rib with cavity, the connecting member, and the buckling-restrained energy dissipation element can be prefabricated and processed in the factory in advance, with high assembly efficiency and convenient and simple construction.

[0034] 3. The buckling-restrained energy dissipation element enables the effective absorption of seismic energy in the weak area of the beam-column joint when an earthquake occurs, avoiding brittle failure of the joint and improving the overall seismic performance of the structure. Description of the Drawings

[0035] The drawings forming a part of this application are used to provide a further understanding of this application. The schematic embodiments of this application and their descriptions are used to explain this application and do not constitute an improper limitation to this application. In the drawings:

[0036] Figure 1 is a schematic diagram of the overall structure of the present invention;

[0037] Figure 2Schematic diagram of the splicing member and stiffening rib of the present invention;

[0038] Figure 3 Schematic diagram of the outer frame mechanism of the present invention;

[0039] Figure 4 Schematic diagram of the assembly of the splicing member and the connecting member of the present invention;

[0040] Figure 5 Schematic diagram of the connecting member of the present invention;

[0041] Figure 6 Schematic diagram of the stiffening rib of the present invention;

[0042] Figure 7 Schematic diagram of the buckling-restrained energy dissipation element of the present invention.

[0043] In the figure: 1, upper steel column pipe; 2, lower steel column pipe; 3, splicing member; 31, first assembly hole; 32, built-in stiffening steel plate; 33, second assembly hole; 34, external web; 4, stiffening rib; 41, connecting web; 42, first flange; 43, third assembly hole; 5, connecting member; 51, fixing steel plate; 52, second flange; 53, fourth assembly hole; 54, pin shaft; 55, circular ring friction plate; 6, buckling-restrained energy dissipation element; 61, connecting steel plate; 62, through slot; 63, restraint shell; 64, restraint strip; 7, precast beam; 8, outer frame mechanism; 81, frame body; 82, outer steel plate; 83, fifth assembly hole; 84, return slot; 85, first notch groove; 86, second notch groove. Detailed implementation manners

[0044] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

[0045] To make the above objects, features, and advantages of the present invention more obvious and understandable, the present invention will be further described in detail below in conjunction with the accompanying drawings and specific implementation manners.

[0046] Refer to Figures 1 - 7 , the present invention provides a prefabricated square steel tube confined concrete column-beam joint, including an upper steel column pipe 1, a lower steel column pipe 2, and a connecting mechanism disposed between the upper steel column pipe 1 and the lower steel column pipe 2. The upper steel column pipe 1, the lower steel column pipe 2, and the connecting mechanism are integrally formed by concrete pouring;

[0047] The connecting mechanism includes:

[0048] A plurality of splicing pieces 3 are arranged at equal intervals in the circumferential direction, and a first assembly hole 31 is provided on each splicing piece 3;

[0049] A plurality of reinforcing ribs 4 are arranged to overlap and enclose a plurality of splicing pieces 3 in an interlaced manner to form a core tube, and the reinforcing ribs 4 are connected to two adjacent splicing pieces 3;

[0050] A plurality of connecting members 5, corresponding one-to-one to the plurality of splicing members 3 and rotatably connected to the first assembly holes 31, a plurality of anti-buckling restraint energy dissipation elements 6 are provided between the connecting members 5 and the splicing members 3, and a prefabricated beam 7 is connected to the side of the connecting member 5 away from the splicing member 3;

[0051] The outer frame mechanism 8 covers the core tube and is connected to the splicing piece 3 .

[0052] The core tube is formed by staggered overlapping of multiple splicing pieces 3 and multiple reinforcing ribs 4, which enhance the restraining effect of the node on the concrete. This not only enhances the bearing capacity of the concrete, but also enables the steel pipe and concrete to work together better. This structure makes the node rigid, high in bearing capacity and strong in shear resistance, while solving the problem of excessive stirrups and inconvenient construction in the node area due to shear resistance.

[0053] In one embodiment of the present invention, the splicing element 3 comprises:

[0054] The internal reinforcement plate 32 is provided with a plurality of second assembly holes 33 for connecting to the reinforcing ribs 4. The internal reinforcement plate 32 is connected to the buckling restraint energy dissipation element 6. The external web 34 is connected to the internal reinforcement plate 32 and has first assembly holes 31 formed therein. The internal reinforcement plate 32 and the external web 34 are connected vertically, forming a "T" shape.

[0055] In one embodiment of the present invention, the reinforcing rib 4 comprises:

[0056] Connecting web 41; a pair of first wing plates 42, obliquely arranged on both sides of the connecting web 41, a plurality of third assembly holes 43 are opened on the first wing plates 42, and a pair of first wing plates 42 are respectively connected to the two adjacent built-in reinforcing steel plates 32 through a plurality of third assembly holes 43 and a plurality of second assembly holes 33 by bolts and nuts.

[0057] The reinforcing ribs 4 can not only resist the horizontal shear force, but also the pair of first wing plates 42 extend outward at an oblique angle of 45 degrees, making the connection between the reinforcing ribs 4 and other internal reinforcing steel plates 32 easier.

[0058] In one embodiment of the present invention, the connector 5 comprises:

[0059] The fixing steel plate 51 is connected to the precast beam 7 and the buckling-restrained energy dissipation element 6; a pair of second wing plates 52 are connected to the fixing steel plate 51, and a fourth assembly hole 53 is formed on the second wing plate 52. The external web 34 is located between the pair of second wing plates 52, and the first assembly hole 31 and the pair of fourth assembly holes 53 are rotatably connected by a pin shaft 54. A circular friction plate 55 sleeved on the pin shaft 54 is arranged between the second wing plate 52 and the external web 34.

[0060] When an earthquake comes, the connecting member 5 can rotate to a certain extent through the pin shaft 54 part, so as to cooperate with the buckling-restrained energy dissipation element 6 to provide seismic performance, and the circular friction plate 55 can increase the friction force between the second wing plate 52 and the external web 34.

[0061] In an embodiment of the present invention, the outer frame mechanism 8 includes:

[0062] A frame body 81; a plurality of outer steel plates 82 are circumferentially arranged on the frame body 81, and a fifth assembly hole 83 is formed on the outer steel plate 82. The fifth assembly hole 83, the second assembly hole 33 and the third assembly hole 43 are connected by bolts and nuts. A circular slot 84 is formed on the frame body 81. The outer steel plate 82 has a right-angle structure, and the plurality of outer steel plates 82 are inserted into the circular slot 84.

[0063] The frame body 81 is divided into an inner frame and an outer frame, and circular hole bolt holes are arranged at the center positions around the four sides to connect the inner frame and the outer frame. A circular slot 84 with a closed bottom end is formed between the inner frame and the outer frame. The outer steel plate 82 extends into the circular slot 84 of the frame body 81 along the length direction, and the right-angle structure of the outer steel plate 82 corresponds to the corner of the circular slot 84 to limit and fix the outer steel plate 82.

[0064] In an embodiment of the present invention, first notch grooves 85 are respectively formed on the end faces of two adjacent outer steel plates 82 close to each other, and the two adjacent first notch grooves 85 form a first avoidance hole, and the buckling-restrained energy dissipation element 6 passes through the first avoidance hole.

[0065] In an embodiment of the present invention, second notch grooves 86 are respectively formed on the end faces of two adjacent outer steel plates 82 close to each other, and the two adjacent second notch grooves 86 form a second avoidance hole, and the external web 34 passes through the second avoidance hole.

[0066] In an embodiment of the present invention, the buckling-restrained energy dissipation element 6 includes:

[0067] A connecting steel plate 61, the two ends of which are respectively connected to the splicing member 3 and the connecting member 5, and a plurality of through grooves 62 are formed on the connecting steel plate 61; a constraint shell 63 is wrapped on the connecting steel plate 61, and a plurality of constraint bars 64 are fixedly connected to the constraint shell 63, and the plurality of constraint bars 64 are respectively located in the plurality of through grooves 62.

[0068] Both ends of the connecting steel plate 61 are respectively welded and fixed to the built-in reinforcing steel plate 32 and the fixing steel plate 51. The constraint shell 63 is a split structure of a pair of half shells and can be connected by bolts or welded.

[0069] In the description of the present invention, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present invention.

[0070] The embodiments described above are only descriptions of the preferred embodiments of the present invention, and do not limit the scope of the present invention. Without departing from the design spirit of the present invention, various deformations and improvements made by those of ordinary skill in the art to the technical solutions of the present invention should fall within the protection scope determined by the claims of the present invention.

Claims

1. An assembled square steel tube confined concrete column-beam joint, characterized in that It comprises an upper steel column pipe (1), a lower steel column pipe (2), and a connecting mechanism provided between the upper steel column pipe (1) and the lower steel column pipe (2), wherein the upper steel column pipe (1), the lower steel column pipe (2), and the connecting mechanism are integrally cast by concrete; The connecting mechanism comprises: A plurality of splicing pieces (3) are arranged at equal intervals in the circumferential direction, and a first assembly hole (31) is provided on each of the splicing pieces (3); A plurality of reinforcing ribs (4) are arranged one by one in an interlaced and overlapping manner with a plurality of the splicing pieces (3) to enclose and form a core tube, and the reinforcing ribs (4) are connected to two adjacent splicing pieces (3); A plurality of connecting members (5) corresponding one-to-one to the plurality of splicing members (3) and rotatably connected to the first assembly hole (31); a plurality of anti-buckling constraint energy-dissipating elements (6) are provided between the connecting members (5) and the splicing members (3); and a prefabricated beam (7) is connected to a side of the connecting member (5) away from the splicing member (3); An outer frame mechanism (8) covers the core tube, and the outer frame mechanism is connected to the splicing piece (3).

2. The assembled square steel tube confined concrete column-beam joint according to claim 1, wherein The splicing piece (3) comprises: A built-in reinforcing steel plate (32) is provided with a plurality of second assembly holes (33), wherein the second assembly holes (33) are used to be connected to the reinforcing ribs (4), and the built-in reinforcing steel plate (32) is connected to the anti-buckling restraint energy dissipation element (6); An external web (34) is connected to the internal reinforcement steel plate (32), and the external web (34) is provided with the first assembly hole (31).

3. The assembled square steel tube confined concrete column-beam joint according to claim 2, characterized in that, The reinforcing rib (4) comprises: Connecting web (41); A pair of first wing plates (42) are obliquely arranged on both sides of the connecting web (41); a plurality of third assembly holes (43) are opened on the first wing plates (42); the pair of first wing plates (42) are respectively connected to the two adjacent built-in reinforcement steel plates (32) through the plurality of third assembly holes (43) and the plurality of second assembly holes (33) by bolts and nuts.

4. The assembled square steel tube confined concrete column-beam joint according to claim 2, characterized in that, The connecting member (5) comprises: A fixed steel plate (51) connected to the prefabricated beam (7) and the buckling restraint energy dissipation element (6); A pair of second wing plates (52) are connected to the fixed steel plate (51), and a fourth assembly hole (53) is provided on the second wing plates (52). The external web (34) is located between the pair of second wing plates (52), and the first assembly hole (31) and the pair of fourth assembly holes (53) are rotatably connected via a pin shaft (54).

5. The assembled square steel tube confined concrete column-beam joint according to claim 4, wherein A circular friction plate (55) sleeved on the pin (54) is provided between the second wing plate (52) and the external web (34).

6. The assembled square steel tube confined concrete column-beam joint according to claim 3, wherein The outer frame mechanism (8) comprises: Frame (81); A plurality of outer steel plates (82) are circumferentially arranged on the frame (81); a fifth assembly hole (83) is opened on the outer steel plate (82); and the fifth assembly hole (83) is connected to the second assembly hole (33) and the third assembly hole (43) through bolts and nuts.

7. The assembled square steel tube confined concrete column-beam joint according to claim 6, characterized in that, A circular slot (84) is formed in the frame body (81). The outer steel plate (82) has a right-angled structure, and a plurality of the outer steel plates (82) are inserted into the circular slot (84).

8. The assembled square steel tube confined concrete column-beam joint according to claim 6, characterized in that First notch grooves (85) are respectively formed in the end faces of two adjacent outer steel plates (82) close to each other. The first notch grooves (85) of two adjacent ones form a first avoidance hole, and the buckling-restrained energy dissipation element (6) passes through the first avoidance hole.

9. The assembled square steel tube confined concrete column-beam joint according to claim 6, characterized in that, Second notch grooves (86) are respectively formed in the end faces of two adjacent outer steel plates (82) close to each other. The second notch grooves (86) of two adjacent ones form a second avoidance hole, and the external web (34) passes through the second avoidance hole.

10. The assembled square steel tube confined concrete column-beam joint according to claim 1, wherein, The buckling-restrained energy dissipation element (6) includes:[[]]END] A connecting steel plate (61) with two ends respectively connected to the splicing member (3) and the connecting member (5). A plurality of through grooves (62) are formed in the connecting steel plate (61); A constraint shell (63) covering the connecting steel plate (61). A plurality of constraint bars (64) are fixedly connected to the constraint shell (63), and the plurality of constraint bars (64) are respectively located in the plurality of through grooves (62).

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