PBL stiffening connection node for rectangular concrete filled steel tubular column and U-shaped steel-concrete composite beam

Abstract

The utility model discloses a rectangular concrete filled steel tubular column and U-shaped steel-concrete composite beam PBL stiffening connection joint which comprises a rectangular concrete filled steel tubular column and a U-shaped steel-concrete composite beam. The rectangular steel pipe concrete column comprises a rectangular steel pipe, PBL stiffening ribs and column concrete, a plurality of round holes are formed in the side wall of the rectangular steel pipe, the PBL stiffening ribs are provided with a plurality of round holes, are obliquely arranged in a node area and are welded to the rectangular steel pipe, and the column concrete is poured into the rectangular steel pipe; the U-shaped steel-concrete composite beam comprises a U-shaped steel beam, beam steel bars and beam concrete, the U-shaped steel beam comprises an upper flange steel plate, a lower flange steel plate, a web steel plate, studs and reinforcing side plates, and the upper flange steel plate and the lower flange steel plate of the U-shaped steel beam are welded to the rectangular steel pipe; the U-shaped steel beam web steel plate is welded with the rectangular steel pipe and is aligned with the PBL stiffening rib, the toggle pin is welded on the upper side of the upper flange steel plate, the reinforcing side plate is welded with the steel beam lower flange steel plate and the rectangular steel pipe, the beam steel bar is fixed through a hole in the side wall of the rectangular steel pipe, and the beam concrete is poured into the U-shaped steel beam. The joint has the advantages of being clear in joint force transmission, simple in structure, convenient to construct and attractive in appearance, occupying no space outside the column and having great engineering application value.

Description

Technical Field

[0001] The present application belongs to the technical field of beam-column nodes of building structures, and specifically relates to a PBL stiffening connection node between a rectangular steel tube concrete column and a U-shaped steel-concrete composite beam. Background Art

[0002] Rectangular steel tube concrete column refers to pouring plain concrete in the steel tube, so that the steel tube and concrete serve as vertical load-bearing components together. It has high strength, good plasticity and toughness, and has the advantages of regular cross-section, easy processing, convenient transportation and convenient construction. U-shaped steel-concrete composite beam is a new type of composite beam. The U-shaped steel beam can not only bear force directly, but also serve as a concrete construction template. The inner filling concrete can increase the fire resistance of the steel beam and effectively delay the local buckling of the steel beam flange and web. At the same time, by increasing the bending stiffness of the steel beam, the beam height, deformation and vibration can be reduced. Therefore, it has good application prospects.

[0003] In order to ensure the requirements of strong nodes and weak components, traditional nodes use outer ring plates, inner partitions or through ring plates to transfer the force of the steel beam flange. However, the inner partition type node is usually used when the column size is large, and the beam flange and the inner partition are applied with full penetration welds on both sides of the same part of the column wall, which is easy to cause stress concentration, resulting in the steel here being easy to delaminate or brittle failure; in addition, the welding of the inner partition is troublesome and will affect the pouring quality of concrete. The ring plate of the outer ring plate node uses a large amount of steel, and the protruding ring plate occupies the building space and affects the appearance. The steel pipes in the node area of ​​the partition through node need to be constructed in sections, which may bring additional construction and manufacturing costs and have an adverse effect on the seismic performance of the node. Summary of the invention

[0004] The purpose of the embodiment of the present application is to provide a PBL stiffening connection node between a rectangular steel tube concrete column and a U-shaped steel-concrete composite beam, which has clear force transmission, simple structure, convenient construction, beautiful appearance, and does not occupy space outside the column. Therefore, it can solve at least one technical problem involved in the background technology. In order to solve the above technical problems, the present application is implemented as follows:

[0005] A rectangular steel tube concrete column and a U-shaped steel-concrete composite beam PBL stiffening connection node, comprising a rectangular steel tube concrete column and a U-shaped steel-concrete composite beam;

[0006] The rectangular steel tube concrete column comprises a rectangular steel tube, a PBL stiffening rib and column concrete, the rectangular steel tube is welded by two cold-bent C-shaped steels, the PBL stiffening rib is located in the beam-column node area and welded to two adjacent steel plates, and the column concrete is poured into the rectangular steel tube;

[0007] Optionally, the PBL stiffening rib is located in the node area and extends toward the upper column or the lower column by 1 / 2 column width, respectively, with a length of l=B+h, where B is the column width and h is the height of the U-beam web.

[0008] Optionally, the PBL stiffening rib is in a long strip plate-like structure, and is penetrated by a plurality of circular holes arranged at intervals along its length direction.

[0009] Optionally, the plurality of circular holes are arranged at equal intervals, the diameter of the circular hole is d=0.2-0.5b, and the spacing between the circular holes is s≥2.25d, wherein d is the diameter of the circular hole, s is the spacing between the circular holes, and b is the width of the stiffening rib.

[0010] Optionally, the size and position of the through holes on the steel plate are set according to the upper longitudinal reinforcement in the beam.

[0011] The U-shaped-steel-concrete composite beam comprises a U-shaped steel beam, beam reinforcement and beam concrete. The U-shaped steel beam comprises a flange steel plate, a web steel plate, bolts and a reinforced side plate. The bolts are located on the upper side of the upper flange steel plate. The flange steel plate and the web steel plate of the U-shaped steel beam are welded to the rectangular steel pipe and aligned with the web steel plate of the steel beam. The reinforced side plate is welded to the lower flange steel plate and the steel pipe of the steel beam. The beam reinforcement is fixed through holes on the rectangular steel pipe. The beam concrete is poured into the U-shaped steel beam.

[0012] Optionally, the bolts are arranged in multiple intervals, and the spacing between the bolts should satisfy s≤35.5t(235 / f y ) 0.5 , where s is the stud spacing, t is the thickness of the upper flange of the U-shaped steel beam, and f y is the yield strength of the U-shaped steel beam.

[0013] Optionally, the height of the bolt is not less than 4 times the diameter of the bolt.

[0014] Optionally, the reinforcing side plate is a polygon with a width of w=(Bb) / 2 and a length of l s ≥w, where B is the column width and b is the width of the lower flange of the beam.

[0015] The beneficial effects of this application are:

[0016] (1) By setting PBL stiffeners in the node area where the rectangular steel tube concrete column and the U-shaped steel-concrete composite beam are connected, they can effectively improve the longitudinal shear force transfer capacity of the interface as shear connectors in the vertical direction, so that the shear force of the composite beam can be more directly transferred to the core concrete; in the horizontal direction, they can effectively constrain the steel tube and concrete in the node area, and effectively transfer the tension or pressure of the U-shaped steel beam flange to the column steel tube and core concrete, thereby alleviating the stress and deformation concentration of the steel tube in the node area;

[0017] (2) By setting circular holes on the PBL stiffeners, the column concrete at the node can pass through to form a concrete tenon, so that the stiffeners and rectangular steel tubes can be synergistically stressed to prevent voids, effectively improving the mechanical properties of the node;

[0018] (3) By setting a reinforced side plate on the lower flange of the U-shaped steel beam, the stress and deformation concentration of the steel pipe in the node area can be effectively alleviated, and the plastic hinge can be moved outward, thereby effectively improving the seismic performance of the node;

[0019] (4) This new type of node has clear force transmission, simple structure, convenient construction, beautiful appearance, and does not occupy space outside the column. It inherits the advantages of traditional nodes and overcomes the shortcomings of traditional nodes in terms of force performance and economic performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] Figure 1 It is a schematic diagram of the beam-column node structure;

[0021] Figure 2 This is one of the schematic diagrams of the rectangular steel tube structure of the beam-column node;

[0022] Figure 3 This is the second schematic diagram of the rectangular steel tube structure of the beam-column node;

[0023] Figure 4 This is one of the schematic diagrams of the U-shaped steel beam structure at the beam-column node;

[0024] Figure 5 This is the second schematic diagram of the U-shaped steel beam structure at the beam-column node;

[0025] Figure 6 This is a top view structural diagram of the beam-column node;

[0026] Figure 7 This is the front view structural diagram of the beam-column node;

[0027] Figure 8 This is a schematic diagram of the PBL stiffening rib structure; DETAILED DESCRIPTION

[0028] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0029] In the following, in conjunction with the accompanying drawings, the connection node between the rectangular steel tube concrete column and the U-shaped-steel-concrete composite beam provided in the embodiment of the present application is described in detail through specific embodiments and their application scenarios.

[0030] See also Figure 1-6As shown, an embodiment of the present application provides a PBL stiffened connection node between a rectangular steel tube concrete column and a U-shaped steel-concrete composite beam, comprising a rectangular steel tube concrete column 1 and a U-shaped steel-concrete composite beam 2.

[0031] The concrete-filled steel tube column 1 can be implemented in two ways.

[0032] The first type, the rectangular steel tube concrete column 1 includes a rectangular steel tube 11, a PBL stiffening rib 12 and a column concrete 13, the rectangular steel tube 11 is welded by two cold-bent C-shaped steels 111a, the cold-bent C-shaped steel 111a is provided with a through hole 1112, the PBL stiffening rib 12 is located in the beam-column node area and is welded to two adjacent steel plates, and can be combined Figure 2 shown.

[0033] The second type, the rectangular steel tube concrete column 1 includes a rectangular steel tube 11, a PBL stiffening rib 12 and a column concrete 13. The rectangular steel tube 11 is welded by four steel plates 111b to form the rectangular steel tube 11. The steel plate 111b has a rectangular opening 1111. Specifically, the steel plate 111b has two parallel rectangular openings 1111 along its width direction. The upper part of the steel plate 111b is penetrated by holes 1112. The holes 1112 are distributed in a straight line along the width direction of the perforated steel plate 111b. The PBL stiffening rib 12 is spot-welded in advance at the rectangular opening 1111 on the steel plate 111b, and then welded to the U-shaped steel beam web 213 through the opening 1111, which can be combined with Figure 3 shown.

[0034] The PBL stiffening rib 12 is located in the node area and extends toward the upper column or the lower column by 1 / 2 column width, and has a length of l=B+h, where B is the column width and h is the height of the U-beam web.

[0035] Furthermore, it can be combined with Figure 8 The PBL stiffening rib 12 is in the shape of a long strip, and is penetrated by circular holes 121 arranged at intervals along its length direction. The plurality of circular holes 121 are arranged at equal intervals, and the diameter of the circular hole 121 is d=0.2-0.5b. The spacing of the circular holes 121 is s≥2.25d, wherein d is the diameter of the circular hole, s is the spacing of the circular holes, and b is the width of the stiffening rib.

[0036] The U-shaped steel-concrete composite beam 2 can be implemented in two ways.

[0037] The first type, the U-shaped steel-concrete composite beam 2 includes a U-shaped steel beam 21, beam longitudinal reinforcement 22 and beam concrete 23. The U-shaped steel beam 21 includes two upper flange steel plates 211, a lower flange steel plate 212a, two web steel plates 213, bolts 214 and a reinforcing steel plate 215 welded at the lower flange. The upper flange steel plate 211, the lower flange steel plate 212a and the web 213 of the U-shaped steel beam are welded in advance in the factory. After arriving at the site, the U-shaped steel beam is welded to the steel tube concrete column, and the welding position of the web steel plate 213 is aligned with the PBL stiffening rib. It can be combined with Figure 1 and Figure 4 shown.

[0038] The second type is that the U-shaped steel beam 21 includes two upper flange steel plates 211, a lower flange steel plate 212b, two web steel plates 213 and bolts 214. The U-shaped steel beam is welded to the steel tube concrete column, and the welding position of the web steel plate 213 is aligned with the PBL stiffening rib 12. Figure 5 shown.

[0039] The beam longitudinal reinforcement 22 is fixed through the through holes 1112 on the column perforated steel plate 111 and serves as the upper negative reinforcement in the U-shaped steel-concrete composite beam 2 .

[0040] The studs 214 are fixed to the upper side of the upper flange steel plate 211 of the U-shaped steel beam by full penetration welding. The studs 214 are arranged at intervals, and the spacing should satisfy s≤35.5t(235 / f y ) 0.5 , where s is the stud spacing, t is the thickness of the upper flange of the U-shaped steel beam, and f y is the yield strength of the U-shaped steel beam.

[0041] The embodiments of the present application are described above in conjunction with the accompanying drawings, but the present application is not limited to the above-mentioned specific implementation methods. The above-mentioned specific implementation methods are merely illustrative and not restrictive. Under the guidance of the present application, ordinary technicians in this field can also make many forms without departing from the purpose of the present application and the scope of protection of the claims, all of which are within the protection of the present application.

Claims

1. A PBL stiffening connection node between a rectangular steel tube concrete column and a U-shaped steel-concrete composite beam, characterized in that: It comprises a rectangular steel tube concrete column and a U-shaped steel-concrete composite beam; the rectangular steel tube concrete column comprises a rectangular steel tube, a PBL stiffening rib and column concrete, the rectangular steel tube is welded by two cold-bent C-shaped steels, the PBL stiffening rib is located in the beam-column node area and is welded to two adjacent steel plates, and the column concrete is poured into the rectangular steel tube; the U-shaped steel-concrete composite beam comprises a U-shaped steel beam, beam reinforcement and beam concrete, the U-shaped steel beam comprises a flange steel plate, a web steel plate, studs and a reinforced side plate, the studs are located on the upper side of the upper flange steel plate, the flange steel plate and the web steel plate of the U-shaped steel beam are welded to the rectangular steel tube and aligned with the web steel plate of the steel beam, the reinforced side plate is welded to the lower flange steel plate and the steel tube of the steel beam, the beam reinforcement is fixed through holes on the rectangular steel tube, and the beam concrete is poured into the U-shaped steel beam.

2. The rectangular steel tube concrete column and U-shaped steel-concrete composite beam PBL stiffening connection node according to claim 1 is characterized in that: The PBL stiffening rib is located in the node area and extends toward the upper column or the lower column by 1 / 2 column width, respectively, and has a length of l=B+h, where B is the column width and h is the height of the U-beam web.

3. The rectangular steel tube concrete column and U-shaped steel-concrete composite beam PBL stiffening connection node according to claim 2 is characterized in that: The PBL stiffening rib is a long strip plate structure, and is penetrated by a plurality of circular holes arranged at intervals along its length direction; the plurality of circular holes are arranged at equal intervals, the diameter of the circular holes is d=0.2-0.5b, and the spacing of the circular holes is s≥ 2.25d, where d is the diameter of the circular hole, s is the spacing between the circular holes, and b is the width of the stiffening rib.

4. The rectangular steel tube concrete column and U-shaped steel-concrete composite beam PBL stiffening connection node according to claim 1 is characterized in that: The size and position of the through holes on the steel plate are set according to the upper longitudinal reinforcement in the beam.

5. The rectangular steel tube concrete column and U-shaped steel-concrete composite beam PBL stiffening connection node according to claim 1 is characterized in that: The studs are located on the upper flange of the steel beam, and multiple studs are arranged at intervals. The spacing between the studs should meet the requirement of s≤35.5t(235 / f y ) 0.5 , where s is the stud spacing, t is the thickness of the upper flange steel of the U-shaped steel beam, and f y is the yield strength of the U-shaped steel beam; the height of the stud is not less than 4 times the diameter of the stud.

6. The rectangular steel tube concrete column and U-shaped steel-concrete composite beam PBL stiffening connection node according to claim 1 is characterized in that: The reinforcing side plate is a polygon, with a width of w=(Bb) / 2 and a length of l s ≥w, where B is the column width and b is the width of the lower flange of the beam.

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