CN209339326U - A steel-concrete composite node - Google Patents

Abstract

The utility model discloses a steel-concrete composite node, which uses H-shaped beams and H-shaped columns to form a connection node with a reinforced concrete floor slab. The reinforced concrete floor is composed of horizontal and vertical steel bars and concrete slabs. The steel beam and the reinforced concrete floor are connected by shear connectors. The column flange and the column web are welded with transverse stiffeners. The beams and columns are connected by flanges. Welded seam connection and web high-strength bolt connection are used to connect H-beams with concrete floor slabs to H-shaped columns or box columns. It is easy to process, reduces the risk of brittle fracture of the lower flange of the beam and realizes plastic hinges on the beam The characteristics of moving outward, good load-bearing performance of nodes, wide application range, convenient connection of this structure, can essentially improve the problem of stress concentration at the weld of the lower flange of the beam, and can make the plastic hinge on the beam move outward, thereby increasing the joint strength. Ductility and energy dissipation performance, fast construction speed, and guaranteed project quality.

Description

A steel-concrete composite node

technical field

The utility model belongs to the field of construction engineering and relates to a steel-concrete composite node.

Background technique

The steel-concrete composite structure is a new type of structure formed by the reasonable combination of steel and concrete materials. In recent years, it has been widely used in high-rise and super high-rise buildings in China. The composite beam is a structural beam formed by connecting steel beams and (reinforced) concrete slabs through shear connectors, which make full use of the respective material properties of steel and concrete materials. The joints formed by the connection of composite beams and steel columns are called "composite joints". When the combined joints bear the action of positive bending moment, the concrete floor at the joint is under compression; when the joint is under the action of negative bending moment, the steel bars in the concrete floor participate in the tension. Compared with pure steel beams, steel-concrete composite beams can increase the bearing capacity, overall stability and stiffness of beams, and then enhance the stability and bearing capacity of steel frame structures; compared with reinforced concrete beams, steel-concrete composite beams can Reduce the cross-sectional size of the beam and column, thereby reducing the height of the beam structure, reducing the self-weight of the structure, and facilitating construction and installation. However, the steel-concrete composite beam also has its disadvantages. Due to the existence of the concrete floor, the stiffness of the composite joint increases, reducing its ductility; the neutral axis of the composite beam section moves upward, making the stress of the upper and lower flanges Inconsistent levels, higher stress peaks at the lower flange of the beam. The composite joints of symmetrical steel beam sections, which are widely used in practical engineering, are difficult to meet the seismic requirements of the plastic hinge on the beam moving outward and the "strong node and weak member". The use of this connection form in the district has buried certain hidden dangers.

Utility model content

The purpose of the utility model is to provide a steel-concrete composite node to overcome the deficiencies of the prior art.

In order to achieve the above object, the utility model adopts the following technical solutions:

A steel-concrete composite node, comprising H-beams, H-columns and reinforced concrete floor slabs;

The reinforced concrete floor slab includes a concrete slab and reinforcing steel bars arranged on the upper and lower sides of the concrete slab;

The H-shaped beam includes a beam web and a beam upper flange and a beam lower flange vertically arranged on both sides of the beam web;

The H-shaped column includes a column web and two column flanges vertically arranged on the left and right sides of the column web, and the inner side walls of the two column flanges are fixed with multi-layer and column web and column flange sides. The transverse partitions are all welded; the outer wall of the column flange is welded with a connecting plate perpendicular to the column flange, and the connecting plate and the beam web are connected by multiple bolts;

A plurality of shear connectors are fixed on the upper surface of the upper flange of the beam, and the shear connectors are fixed in the concrete slab.

Further, the reinforcing steel bars include longitudinal steel bars and transverse steel bars arranged horizontally and vertically on the upper and lower sides of the concrete slab.

Further, the width of the upper flange of the beam is smaller than the width of the lower flange of the beam.

Further, the width ratio of the upper flange of the beam to the lower flange of the beam is 0.75.

Further, both sides of the lower flange of the beam near the flange of the column are provided with arc-shaped grooves.

Further, the upper and lower layers of transverse partitions welded to the column web and the side of the column flange are fixed between the inner side walls of the two column flanges.

Further, the thickness of the transverse partition is not less than the thickness of the upper flange of the beam or the thickness of the lower flange of the beam, and the upper surface of the upper transverse partition is flush with the upper surface of the upper flange of the beam; the upper surface of the lower transverse partition is flush with the upper surface of the lower flange of the beam .

Further, the shear connectors are welded on the upper surface of the upper flange of the steel beam, the shear connectors are arranged in single or double rows, and the multiple bolts are arranged longitudinally in single or multiple rows.

Compared with the prior art, the utility model has the following beneficial technical effects:

The utility model discloses a steel-concrete composite node, which uses H-shaped beams and H-shaped columns to form connection nodes with reinforced concrete floor slabs. The reinforced concrete floor is composed of horizontal and vertical steel bars and concrete slabs. The steel beam and the reinforced concrete floor are connected by shear connectors. The column flange and the column web are welded with transverse stiffeners. The beams and columns are connected by flanges. Welded seam connection and web high-strength bolt connection are used to connect H-beams with concrete floor slabs to H-shaped columns or box columns. It is easy to process, reduces the risk of brittle fracture of the lower flange of the beam and realizes plastic hinges on the beam The characteristics of moving outward, good load-bearing performance of nodes, wide application range, convenient connection of this structure, can essentially improve the problem of stress concentration at the weld of the lower flange of the beam, and can make the plastic hinge on the beam move outward, thereby increasing the joint strength. Ductility and energy dissipation performance, fast construction speed, and guaranteed project quality.

Furthermore, the width ratio of the upper flange of the beam to the lower flange of the beam is 0.75, and an arc weakening is set at a certain distance from the lower flange of the beam to the beam end, so that the neutral axis of the composite beam section at the composite node is close to the center of the steel beam section, thus To avoid the risk of a significant increase in the stress at the weld of the lower flange of the beam, at the same time, due to the existence of the concrete floor, the buckling of the upper flange of the beam is limited, and the arc weakening is only set on the lower flange of the beam at a certain distance from the end of the beam, which can The plastic hinge on the top of the beam moves outward, and the buckling deformation is concentrated at the arc weakened part of the lower flange of the beam, and the section form of the uniaxially symmetrical steel beam, which is narrow at the top and wide at the bottom and only weakened by the arc of the lower flange of the beam, can be processed in the factory and installed on site Exactly the same as a traditional connection without increasing the workload on site.

Description of drawings

Fig. 1 is the main view structure schematic diagram of the utility model combination node;

Fig. 2 is the top view structure schematic diagram of the steel beam-column joint of the utility model;

Fig. 3 is the structural schematic diagram looking up of the utility model steel beam-column node;

In the figure: 1-column flange, 2-column web, 3-beam upper flange, 4-beam lower flange, 5-beam web, 6-transverse partition, 7-connecting plate, 8-connecting bolt, 9 -concrete, 10-longitudinal reinforcement, 11-transverse reinforcement, 12-shear connector.

Detailed ways

Below in conjunction with accompanying drawing, the utility model is described in further detail:

As shown in Figures 1 to 3, a steel-concrete composite node includes H-shaped beams, H-shaped columns and reinforced concrete floors;

The reinforced concrete floor slab includes a concrete slab 9 and longitudinal reinforcement bars 10 and transverse reinforcement bars 11 arranged horizontally and vertically on the upper and lower sides of the concrete slab 9;

The H-shaped beam includes a beam web 5 and a beam upper flange 3 and a beam lower flange 4 vertically arranged on both sides of the beam web 5, the width of the beam upper flange 3 is smaller than the width of the beam lower flange 4, and the beam lower flange 4 is close to the column There are arc grooves on both sides of the flange;

The H-shaped column includes a column web 2 and two column flanges 1 vertically arranged on the left and right sides of the column web 2, and the inner walls of the two column flanges 1 are fixed with multiple layers and the column web 2 The horizontal partition 6 that is in contact with the side of the column flange 1; specifically, this application adopts two layers of horizontal partitions 6; The upper surface of the lower flange 4 is in the same plane;

The outer wall of the column flange 1 is welded with a connecting plate 7 perpendicular to the column flange 1, and the connecting plate 7 and the beam web 5 are connected by a plurality of bolts 8;

A plurality of shear connectors 12 are fixed on the upper surface of the beam upper flange 3, and the shear connectors 12 are fixed in the concrete slab 9; the shear connectors 12 are welded on the upper surface of the steel beam upper flange 3; the H-shaped beam is welded by three steel plates. A uniaxially symmetrical welded H-shaped steel, the H-shaped column is a hot-rolled H-shaped steel;

The shear connectors 12 are arranged in single or double rows, and are welded to the upper end surface of the upper flange 3 of the beam;

In this specific embodiment, the upper surface of the transverse partition 6 is flush with the upper surface of the upper flange of the beam; the ratio of the width of the upper flange of the beam to the lower flange of the beam is 0.75; multiple bolts are arranged longitudinally in single or multiple rows; the shear connectors are Arranged in single row or double row; the combined joint between the H-beam and the H-column with the concrete floor of the utility model is completed in the factory through the H-column, and the upper narrow and the lower width are only uniaxially symmetrical H-shaped weakened by the arc of the lower flange of the beam Beam processing, and then on-site through beam flange butt weld connection and beam web high-strength bolt connection to form a steel beam-column joint with bolted and welded joints, and finally weld shear connectors on the surface of the upper flange of the beam, and bind the steel mesh and pour concrete Slabs, forming composite nodes.

The above-mentioned method for making the composite joint between the H-beam with the concrete floor and the H-column connection comprises the following steps:

Step 1. Weld the transverse partition 6 between the column flange 1 and the column web 2: Weld the upper and lower transverse partitions 6 between the column flange 1 and the column web 2 of the H-shaped column, the number of transverse partitions 6 There are 4 pieces, the upper surface of the upper transverse partition 6 is flush with the upper surface of the upper flange of the beam; the upper surface of the lower transverse partition 6 is flush with the upper surface of the lower flange of the beam;

Before welding, arc-shaped weakening on the beam lower flange 4: arc-shaped weakening of the beam lower flange 4 at a certain distance from the beam end;

Step 2. Weld the connecting plate 7 on the column flange 1: Weld the connecting plate 7 on the surface of the column flange 1 of the H-shaped column. The connecting plate 7 corresponds to the position of the beam web 5, and the bolts are reserved on the connecting plate 7 hole;

Step 3. Weld the shear connectors 12 on the upper flange 3 of the beam: Weld a single or double row of shear connectors 12 on the surface of the upper flange 3 of the beam.

Step 4. Weld the H-shaped beam: Weld the beam upper flange 3, the beam lower flange 4 and the beam web 5 to form an H-shaped beam. The ratio of the width of the upper and lower flanges is about 0.75, and reserve bolt holes on the beam web;

Step 5. Use multiple high-strength bolts 8 to connect the beam web 5 with the connecting plate 7. After temporarily fixing, connect the beam upper flange 3, lower flange 4 and column flange 1 with butt welds, and finally connect the high Final tightening of strength bolts.

Step 6. Arrangement of steel bars and pouring of concrete floor slabs: Arrange horizontal steel bars 11 and longitudinal steel bars 10 at certain intervals, bind them into steel mesh, and pour concrete floor slabs above the upper flanges of beams.

Steps 1 to 4 in the manufacturing method of the combined joint connecting the H-beam with the concrete floor and the H-column can all be processed in the factory, so as to speed up the construction speed and ensure the quality of the project, and then use the hybrid connection method of bolt welding on site. The beams and columns are connected conveniently and have good practicability; finally, the concrete floor is laid.

The above detailed description of the preferred embodiments of this patent is to facilitate the understanding and application of the composite node of the present invention by those skilled in the technical field. However, this patent is not limited to the above-mentioned embodiments, and those skilled in the art can make various changes within the scope of their knowledge without departing from the purpose of this patent.

Claims (8)

1. A steel-concrete composite node is characterized in that it comprises H-shaped beams, H-shaped columns and reinforced concrete floor slabs; The reinforced concrete floor slab includes a concrete slab (9) and reinforcement bars arranged on the upper and lower sides of the concrete slab (9); The H-shaped beam includes a beam web (5) and a beam upper flange (3) and a beam lower flange (4) vertically arranged on both sides of the beam web (5); The H-shaped column includes a column web (2) and two column flanges (1) vertically arranged on the left and right sides of the column web (2), and the inner walls of the two column flanges (1) are fixed There are multi-layer transverse partitions (6) welded to both the column web (2) and the side of the column flange (1); the outer wall of the column flange (1) is welded with a connecting plate perpendicular to the column flange (1) ( 7), the connecting plate (7) and the beam web (5) are connected by a plurality of bolts (8); A plurality of shear connectors (12) are fixed on the upper surface of the beam upper flange (3), and the shear connectors (12) are fixed in the concrete slab (9). 2. A kind of steel-concrete composite node according to claim 1, characterized in that, the reinforcing steel bars include longitudinal steel bars (10) and transverse steel bars (11) arranged on the upper and lower sides of the concrete slab (9) horizontally and vertically ). 3. A steel-concrete composite node according to claim 1, characterized in that the width of the upper beam flange (3) is smaller than the width of the beam lower flange (4). 4. A steel-concrete composite node according to claim 3, characterized in that the width ratio of the beam upper flange (3) to the beam lower flange (4) is 0.75. 5. A steel-concrete composite node according to claim 1, characterized in that arc-shaped grooves are provided on both sides of the beam lower flange (4) close to the column flange. 6. A steel-concrete composite node according to claim 1, characterized in that, the upper and lower layers, the column web (2) and the column wing are fixed between the inner walls of the two column flanges (1). A transverse partition (6) that is welded to the sides of the edge (1). 7. A steel-concrete composite node according to claim 6, characterized in that the thickness of the transverse diaphragm (6) is not less than the thickness of the upper flange of the beam or the thickness of the lower flange of the beam, and the upper surface of the upper transverse diaphragm and the upper flange of the beam The upper surface is flush; the upper surface of the lower transverse diaphragm is flush with the upper surface of the lower flange of the beam. 8. A steel-concrete composite node according to claim 1, characterized in that the shear connectors (12) are welded on the upper surface of the upper flange (3) of the steel beam, and the shear connectors (12) are in a single row or Arranged in double rows, a plurality of bolts (8) are longitudinally arranged in single or multiple rows.