Fabricated hollow flange beam component

Abstract

The assembly type hollow flange beam component comprises a steel beam and a side supporting frame, the steel beam comprises a first C-shaped component, a second C-shaped component, a first U-shaped component, a second U-shaped component, a third U-shaped component and a fourth U-shaped component, and the first U-shaped component and the third U-shaped component are arranged at the two ends of the first C-shaped component correspondingly; a second U-shaped component and a fourth U-shaped component are arranged at the two ends of the second C-shaped component respectively; the opening directions of the first C-shaped component and the second C-shaped component are opposite, and the first C-shaped component and the second C-shaped component are connected with the side supporting frame. The steel beam is high in practicability and very convenient to use, deformation of a traditional steel beam web is avoided through the split type hollow flanges, and the steel utilization rate is increased; the flange of the steel beam is arranged to be the closed section, the torsional rigidity and the anti-bending bearing capacity of the steel beam are improved, the high-rise large-span use requirement can be met, and the adverse effect of transverse distortion buckling on the section bearing capacity in a component with the single-axis symmetrical open section is reduced.

Description

Technical Field

[0001] The invention belongs to a beam structure, in particular to an assembled hollow flange beam component. Background Art

[0002] Light steel has always been used as the load-bearing skeleton of buildings. With the extensive application of light steel structures in modular construction, the light steel structure system has been continuously improved. It not only has the advantages of traditional steel structures in modular construction, but also has a higher strength-to-weight ratio and is easier to process and install than traditional steel structures. Cold rolling and hot rolling are the two main processing methods of light steel structures. Cold-formed steel is more efficient and economical in structure than hot-rolled steel. In order to meet the requirements of the construction industry, lightweight and high-strength cold-formed steel is combined with innovative technologies to form various cross-sections. Compared with ordinary steel components, the tensile strength of this cold-formed steel cross-section is improved.

[0003] At present, the cross-sectional form of steel beams has certain limitations. Although hollow flange beams have been proposed in addition to I-beams, the hollow flange form is complex and cumbersome to manufacture. Welding is often used to connect the flange and web. This assembly method not only produces large residual stress, thereby increasing initial defects, but also is inconvenient to construct and costly. Most hollow flange beams use a uniaxially symmetrical open section, whose bending center and shear center do not coincide, and are prone to torsional instability. The lateral distortion buckling in the components with a uniaxially symmetrical open section has an adverse effect on the section bearing capacity. The torsional stiffness and bending bearing capacity of the open section steel beam are also low. As a single component, it cannot meet the use requirements of high-rise large spans. Summary of the invention

[0004] Purpose of the invention: In order to overcome the deficiencies in the prior art, the purpose of the present invention is to provide a prefabricated hollow flange beam component that increases torsional stiffness, improves bending bearing capacity, and reduces lateral distortion buckling.

[0005] Technical solution: The present invention discloses an assembled hollow flange beam component, comprising a steel beam and a side support frame, wherein the steel beam comprises a first C-shaped component, a second C-shaped component, a first U-shaped component, a second U-shaped component, a third U-shaped component and a fourth U-shaped component, wherein the first U-shaped component and the third U-shaped component are respectively arranged at both ends of the first C-shaped component, and the second U-shaped component and the fourth U-shaped component are respectively arranged at both ends of the second C-shaped component; the opening directions of the first C-shaped component and the second C-shaped component are opposite, and they are respectively connected to the side support frame.

[0006] Furthermore, the first C-shaped member, the second C-shaped member, the first U-shaped member, the second U-shaped member, the third U-shaped member, and the fourth U-shaped member are fixedly connected by rivets.

[0007] Furthermore, the structures of the first C-shaped member and the second C-shaped member are exactly the same. The first C-shaped member includes flange one, flange two, a web, flange three, and flange four that are connected to each other; one end of the first C-shaped member is fixedly connected to flange one by a rivet, and the other end is fixedly connected to the web by a rivet; one end of the third U-shaped member is fixedly connected to flange four by a rivet, and the other end is fixedly connected to the web by a rivet.

[0008] Furthermore, the structures of the first U-shaped member, the second U-shaped member, the third U-shaped member and the fourth U-shaped member are completely the same. The first U-shaped member includes a short side 1, a long side and a short side 2, and the lengths of the short side 1 and the short side 2 are equal.

[0009] Furthermore, the ratio of the height of the web to the length of the second flange is 17:7-8, and the distance between the long side and the second flange is 25-30 mm.

[0010] Further, the openings of the first U-shaped member and the third U-shaped member are arranged opposite to each other, and the openings of the second U-shaped member and the fourth U-shaped member are arranged opposite to each other.

[0011] Furthermore, the side support frame includes a bottom plate, a fixing plate and a reinforcing plate. The bottom plate and the fixing plate are perpendicular to each other, and the reinforcing plate is connected to the bottom plate and the fixing plate.

[0012] Furthermore, the base plate is connected to the hydraulic servo motor via fixing bolts.

[0013] Furthermore, the fixing plate is connected to the longitudinal vertical plate through nuts and fastening bolts, and the longitudinal vertical plate abuts against the inner wall of the first C-shaped component or the second C-shaped component adjacent thereto.

[0014] Furthermore, the fixing plate is connected to the lower horizontal vertical plate and the upper horizontal vertical plate respectively through nuts and clamping bolts.

[0015] Working principle: The joint splicing method of rivets and high-strength bolts can more effectively improve the bending bearing capacity of the assembled hollow flange beam (AHFB), and avoid the phenomenon that the self-tapping screws fall off when they are spliced ​​under a large bearing capacity. The slender section adopted can not only bear part of the bending moment but also resist shear force, ensuring the overall stability and safety of the AHFB. Due to the particularity of the hollow flange, the strength of the corner part is improved and the plasticity is reduced. The section is thin, the width and thickness of the plate are relatively large, and the strength is significantly improved after a certain degree of buckling. In terms of cross-sectional form, the difference in the moment of inertia of the two main axis directions is reduced, which improves the overall bending stiffness, torsional stiffness and anti-lateral stiffness of the cross-section, and has better overall stability.

[0016] Method of use: first assemble the steel beam, fix the first C-shaped member and the second C-shaped member with rivets, then install each U-shaped member at both ends of the C-shaped member, and fix the U-shaped member and the C-shaped member with rivets to form the flange of the closed structure. After the assembly is completed, hoist the steel beam to the preset position, and install the side support frame on both sides, use the fixing bolts to fix the side support frame to the lower supporting steel member, and then install the fastening bolts and clamping bolts in the preset holes of the fixing plate, and install the nuts. Adjust the length of the fastening bolts so that the longitudinal plates on both sides clamp the web formed by the two C-shaped members of the steel beam, adjust the length of the clamping bolts so that the lower transverse plate and the fixing plate 202 clamp the upper edge of the lower flange, and the upper transverse plate and the fixing plate clamp the lower edge of the upper flange, thereby laterally constraining the steel beam and reducing the occurrence of lateral distortion and buckling of the steel beam.

[0017] Beneficial effects: Compared with the prior art, the present invention has the following significant features:

[0018] 1. It is highly practical and easy to use. The combined hollow flange can avoid the deformation of the web of traditional steel beams and improve the utilization rate of steel.

[0019] 2. By setting the flange of the steel beam as a closed section, the torsional stiffness and bending bearing capacity of the steel beam are increased, which can meet the use requirements of high-rise and large-span buildings and reduce the adverse effects of lateral distortion buckling on the section bearing capacity in components with uniaxially symmetrical open sections. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the structure of the present invention;

[0021] Figure 2 is a side view of the steel beam 1 of the present invention;

[0022] Figure 3 It is a schematic structural diagram of the side support frame 2 of the present invention;

[0023] Figure 4 It is a schematic diagram of the connection of the longitudinal vertical plate 207 of the present invention;

[0024] Figure 5 It is a schematic diagram of parameter marking of the steel beam 1 of the present invention;

[0025] Figure 6 1 is a stress distribution diagram of the present invention, wherein (a) is the cross-sectional form of AHFB, (b) is a typical stress distribution diagram of an I-beam, (c) is a stress distribution diagram of an AHFB cross section, and (d) is a stress distribution diagram of a cross section with uniform yield strength. DETAILED DESCRIPTION

[0026] like Figure 1A plurality of support frames 2 with the same structure are symmetrically distributed at the openings on both sides of the steel beam 1 of the assembled hollow flange beam component, and the side support frames 2 are used to fix the steel beam 1. The steel beam 1 is made of Q235 steel.

[0027] like Figure 2 The steel beam 1 includes a first C-shaped member 11, a second C-shaped member 12, a first U-shaped member 13, a second U-shaped member 14, a third U-shaped member 15 and a fourth U-shaped member 16. The first C-shaped member 11 and the second C-shaped member 12 have the same structure, and the openings are arranged outward, and the opening directions of the first C-shaped member 11 and the second C-shaped member 12 are opposite. The first U-shaped member 13 and the third U-shaped member 15 are respectively arranged at both ends of the first C-shaped member 11, and the second U-shaped member 14 and the fourth U-shaped member 16 are respectively arranged at both ends of the second C-shaped member 12.

[0028] The structures of the first C-shaped member 11 and the second C-shaped member 12 are completely the same. The first C-shaped member 11 includes a flange 111, a flange 2 112, a web 113, a flange 3 114, and a flange 4 115 connected to each other. One end of the first C-shaped member 11 is fixedly connected to the flange 111 through a rivet 3, and the other end is fixedly connected to the web 113 through a rivet 3. One end of the third U-shaped member 15 is fixedly connected to the flange 4 115 through a rivet 3, and the other end is fixedly connected to the web 113 through a rivet 3.

[0029] The structures of the first U-shaped member 13, the second U-shaped member 14, the third U-shaped member 15, and the fourth U-shaped member 16 are completely the same. The first U-shaped member 13 includes a short side 131, a long side 132, and a short side 133. The lengths of the short side 131 and the short side 133 are equal. The openings of the first U-shaped member 13 and the third U-shaped member 15 are arranged opposite to each other, and the openings of the second U-shaped member 14 and the fourth U-shaped member 16 are arranged opposite to each other. The first U-shaped member 13, the second U-shaped member 14, the third U-shaped member 15, and the fourth U-shaped member 16 are fixed to the curling edges of the first C-shaped member 11 and the second C-shaped member 12 by rivets 3 to form a hollow flange beam member. The cross section of the steel beam is a double-axis symmetrical closed structure.

[0030] like Figures 3-4The side support frame 2 includes a bottom plate 201, a fixing plate 202 and a reinforcing plate 203. The bottom plate 201 and the fixing plate 202 are arranged in an L shape. A longitudinally arranged fixing plate 202 is arranged at one end of the upper surface of the bottom plate 201. A reinforcing plate 203 is arranged on the bottom plate 201 and the fixing plate 202. The lower end of the reinforcing plate 203 is connected to the center of the upper surface of the bottom plate 201. One side of the reinforcing plate 203 is connected to the center of the side surface of the fixing plate 202. The bottom plate 201 is provided with fixing bolts 204, which penetrate the bottom plate 201. The fixing bolts 204 fix the side support frame 2 to the supporting steel member below. The bottom plate 201 is connected to an external 10-ton hydraulic servo through the fixing bolts 204.

[0031] A transversely arranged fastening bolt 206 is provided in the middle of the fixing plate 202, and the fastening bolt 206 passes through the fixing plate 202. A nut 205 threadedly connected to the fastening bolt 206 is provided on the fastening bolt 206, and the nut 205 is arranged on the outside of the fixing plate 202. A longitudinal vertical plate 207 is provided at the end of the fastening bolt 206, and the longitudinal vertical plate 207 abuts against the inner wall of the adjacent first C-shaped member 11 or the second C-shaped member 12. Two transversely arranged clamping bolts 208 are symmetrically provided above and below the fastening bolt 206, and the clamping bolt 208 passes through the fixing plate 202. A nut 205 threadedly connected to the clamping bolt 208 is provided on the clamping bolt 208, and the nut 205 of the clamping bolt 208 is arranged on the outside of the fixing plate 202, and lower transverse vertical plates 209 are provided at the ends of the two clamping bolts 208 below. The two lower transverse vertical plates 209 are both in contact with the inner wall of the lower edge of the flange of the first C-shaped member 11 or the second C-shaped member 12, and the ends of the two upper clamping bolts 208 are provided with upper transverse vertical plates 210. The two upper transverse vertical plates 210 are both in contact with the inner wall of the upper edge of the flange of the first C-shaped member 11 or the second C-shaped member 12. The lower transverse vertical plates 209 on both sides clamp the upper edge of the lower flange with the fixed plate 202, and the upper transverse vertical plates 210 and the fixed plate 202 clamp the lower edge of the upper flange. The longitudinal vertical plates 207 on both sides clamp the web 113 of the first C-shaped member 11 and the web 113 of the second C-shaped member 12, and laterally constrain them to reduce the occurrence of lateral distortion and buckling of the steel beam 1.

[0032] When in use, the steel beam 1 is first assembled, the first C-shaped member 11 and the second C-shaped member 12 are fixed with rivets 3, and then the first U-shaped member 13 and the third U-shaped member 15 are installed at both ends of the first C-shaped member 11, the second U-shaped member 14 and the fourth U-shaped member 16 are installed at both ends of the second C-shaped member 12, and the flange 111 and the short side 131 are fixed with rivets 3, and the two webs 113 and the short side 2 133 of the first U-shaped member 13 and the short side 131 of the third U-shaped member 15 are fixed together with rivets 3 to form the flange of the closed structure. After the assembly is completed, the steel beam 1 is hoisted to the preset position, and the side support frames 2 are installed on both sides, and the side support frames 2 are fixed to the lower supporting steel members with fixing bolts 204. Then, fastening bolts 206 and clamping bolts 208 are installed in the holes preset in the fixing plate 202, and nuts 205 are installed. The length of the fastening bolts 206 is adjusted so that the longitudinal vertical plates 207 on both sides clamp the web formed by the two C-shaped members 101 of the steel beam 1. The length of the clamping bolts 208 is adjusted so that the lower transverse vertical plate 209 and the fixing plate 202 clamp the upper edge of the lower flange, and the upper transverse vertical plate 210 and the fixing plate 202 clamp the lower edge of the upper flange, thereby lateral restraint is applied to the steel beam 1 to reduce the occurrence of lateral distortion buckling of the steel beam 1.

[0033] By comparing the two connection methods of low-cost self-locking rivets 3, locking rivet bolts and nuts and self-tapping screws, it is found that the joint splicing method of rivets 3, high-strength fastening bolts 206, and fixing bolts 204 can more effectively improve the bending bearing capacity of AHFB, and avoid the phenomenon of self-tapping screws falling off due to splicing with self-tapping screws under large bearing capacity.

[0034] In order to study the bending performance and strength of AHFB under concentrated load, and considering the feasibility of the available load and test equipment for testing, seven 1700mm long AHFB members were manufactured for section bending moment bearing capacity tests. f0 -d f1 ), flange width (b f ), flange thickness (t f ), web 113 depth (d w ), web 113 thickness (t w ) are marked, such as Figure 5 shown.

[0035] Seven load tests were conducted on AHFB components. In a series of tests, seven 1700mm long AHFB components were made of Q235. There were four specimens with a specimen size of 140×150×30×1.5×1.5, three of which had different connection spacings, namely 100mm, 150mm and 200mm. Another AHFB with a connection spacing of 100mm connected by self-tapping screws was used as a control for comparative tests to study the effect of the connection method on the bearing capacity of AHFB. In addition, the specimen 140×150×30×1.5×1.5 was compared with 140×170×30×1.5×1.5, 140×150×40×1.5×1.5, 170×150×30×1.5×1.5, and 140×150×30×1.5×1.5, respectively, to study the effects of flange width, flange depth, web 113 depth, and web 113 thickness on the bearing capacity of AHFB. Table 1 gives the cross-sectional classification of the test members.

[0036] Table 1 Classification of test beam cross-section types

[0037]

[0038] AHFB-1 and AHFB-7 have the same flange and web 113, but the bearing capacity of AHFB-1, which is assembled by self-locking rivets 3 and locking rivet bolts and nuts, is 39.71KN and 32.21KN respectively, which is 24% higher than that of AHFB-7, which is assembled by self-tapping screws. This result shows that the connection method of rivets 3 and locking rivet bolts and nuts is obviously better than that of self-tapping screws. At the same time, the self-tapping screws at both ends of the web 113 of AHFB-7 fell off during the test, which is also an important factor leading to the relatively small bending moment bearing capacity of the AHFB-7 section.

[0039] By changing the flange width, flange depth, and web 113 depth of the test piece, it is found that the depth of web 113 has the greatest influence on the bending bearing capacity of AHFB. This is because for the slender section used in the test, web 113 can not only bear part of the bending moment but also resist shear force, ensuring the overall stability and safety of AHFB. The most preferred size design is AHFB-4, that is, the depth of web 113 is 170mm, the length of long side 132 is 75mm, the distance between flange 112 of the first C-shaped member 11 and the long side 132 of the first U-shaped member 13 is 30mm, and the thickness of flange 112 (t f ) is 1.5 mm, the thickness of the web 113 (t w ) is 1.5mm.

[0040] Table 2 Test beam bearing capacity

[0041]

[0042] like Figure 6 , mixed cross section (f yf >f yw 、f yf <f yw ) The flange and web have different yield strengths. The elastic and plastic bending moments of the flange and web are calculated separately. When the flange strength is greater than the web strength, the web will yield earlier than the flange, and the flange has not reached its yield strength (f yf >f yw ), which is still within the elastic range, which makes the flange have an additional elastic bending moment such as Figure 6 (b). Therefore, the stress distribution of the mixed section is similar to that of the section with uniform yield strength (f yw =f yf ) is different from Figure 6 (c) For sections with uniform yield strength throughout, the stress distribution is calculated according to the conventional stress distribution. This allows us to study the importance of using flanges or webs with higher yield strength as members compared to sections with uniform bending moments.

Claims

1. An assembled hollow flange beam component, characterized in that: The invention comprises a steel beam (1) and a side support frame (2), wherein the steel beam (1) comprises a first C-shaped component (11), a second C-shaped component (12), a first U-shaped component (13), a second U-shaped component (14), a third U-shaped component (15) and a fourth U-shaped component (16), wherein the first C-shaped component (11) is provided with a first U-shaped component (13) and a third U-shaped component (15) at two ends, and the second C-shaped component (12) is provided with a second U-shaped component (14) and a fourth U-shaped component (16) at two ends; the first C-shaped component (11) and the second C-shaped component (12) have opening directions opposite to each other and are respectively connected to the side support frame (2).

2. The assembled hollow flange beam member according to claim 1, characterized in that: The first C-shaped member (11), the second C-shaped member (12), the first U-shaped member (13), the second U-shaped member (14), the third U-shaped member (15), and the fourth U-shaped member (16) are fixedly connected via rivets (3).

3. The assembled hollow flange beam member according to claim 1, characterized in that: The structures of the first C-shaped component (11) and the second C-shaped component (12) are completely the same. The first C-shaped component (11) comprises a flange one (111), a flange two (112), a web (113), a flange three (114), and a flange four (115) which are connected to each other. One end of the first C-shaped component (11) is fixedly connected to the flange one (111) via a rivet (3), and the other end is fixedly connected to the web (113) via a rivet (3). One end of the third U-shaped component (15) is fixedly connected to the flange four (115) via a rivet (3), and the other end is fixedly connected to the web (113) via a rivet (3).

4. The assembled hollow flange beam member according to claim 3, characterized in that: The structures of the first U-shaped member (13), the second U-shaped member (14), the third U-shaped member (15) and the fourth U-shaped member (16) are completely the same. The first U-shaped member (13) comprises a short side 1 (131), a long side (132) and a short side 2 (133). The lengths of the short side 1 (131) and the short side 2 (133) are equal.

5. The assembled hollow flange beam member according to claim 4, characterized in that: The ratio of the height of the web (113) to the length of the second flange (112) is 17:7-8, and the distance between the long side (132) and the second flange (112) is 25-30 mm.

6. The assembled hollow flange beam member according to claim 1, characterized in that: The openings of the first U-shaped member (13) and the third U-shaped member (15) are arranged opposite to each other, and the openings of the second U-shaped member (14) and the fourth U-shaped member (16) are arranged opposite to each other.

7. The assembled hollow flange beam member according to claim 1, characterized in that: The side support frame (2) comprises a bottom plate (201), a fixing plate (202) and a reinforcing plate (203); the bottom plate (201) and the fixing plate (202) are perpendicular to each other; and the reinforcing plate (203) is connected to the bottom plate (201) and the fixing plate (202).

8. The assembled hollow flange beam member according to claim 7, characterized in that: The base plate (201) is connected to the hydraulic servo motor via fixing bolts (204).

9. The assembled hollow flange beam member according to claim 7, characterized in that: The fixing plate (202) is connected to the longitudinal upright plate (207) via nuts (205) and fastening bolts (206), and the longitudinal upright plate (207) abuts against the inner wall of the first C-shaped member (11) or the second C-shaped member (12) adjacent thereto.

10. The assembled hollow flange beam member according to claim 7, characterized in that: The fixing plate (202) is connected to the lower transverse vertical plate (209) and the upper transverse vertical plate (210) respectively through nuts (205) and clamping bolts (208).

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