CN116290398A - Impact-resistant cutting reinforced concrete slab column joint - Google Patents

Abstract

The invention discloses a punching-resistant reinforced concrete slab-column joint, which belongs to the field of building structures. Compared with the traditional bent steel bars, stirrups, and anchor bolts, the perforated steel plate is a continuous body on the punching failure surface of the reinforced concrete slab-column joint. The perforated steel plate runs through the entire punching crack, and the perforated steel plate can fully bear the force , to slow down the cracking of concrete, to exert its punching resistance performance more efficiently, and to significantly improve the punching shear bearing capacity of reinforced concrete slab-column joints. The invention has simple structure, convenient installation, installation will not cause interference to the tensile steel mesh and compression steel mesh, easy to locate, can be prefabricated in the factory in advance to shorten the construction period, and effectively improves the punching resistance performance of the reinforced concrete slab-column joint.

Description

A Punching Resistant Reinforced Concrete Slab-Column Joint

technical field

The invention belongs to the field of building structures, in particular to a punching-resistant reinforced concrete slab-column node.

Background technique

The slab-column structure is a structural system composed of floors and columns. The force transmission path is that the floor load is transmitted to the floor, and the floor transmits the load to the column. The force transmission path is simple and clear. The biggest difference from the traditional frame structure is that there are no beams. Therefore, its space is unobstructed and concise, its layout is very flexible, and it can reduce the height of buildings. It is suitable for halls of public buildings and underground garages. However, in recent years, accidents of slab-column structures have occurred frequently, and brittle punching failures are prone to occur.

The punching shear capacity of the slab-column structure can be improved by increasing the concrete strength, floor height, bending reinforcement ratio, column cap, etc. However, some conditions are limited, and when the above-mentioned factors cannot be used to enhance the punching resistance, it is a good choice to configure punching shear keys. Slab-column joints equipped with punching shear keys have better performance and have been applied in the structure.

Contents of the invention

The purpose of the present invention is to overcome the above-mentioned shortcomings of the prior art, and provide a punching-resistant reinforced concrete slab-column joint.

In order to achieve the above object, the present invention adopts the following technical solutions to achieve:

A punching-resistant reinforced concrete slab-column joint, comprising a concrete slab, the bottom of the concrete column is located in the concrete slab, a plurality of perforated steel plates are arranged around the bottom of the concrete column, and the perforated steel plates are vertically arranged in the concrete slab.

Further, the upper and lower sides of the concrete slab are respectively provided with tension reinforcement mesh and compression reinforcement mesh;

The open-hole steel plate is located between the tension steel mesh and the compression steel mesh.

Further, patterned steel plates are provided on the surface of the perforated steel plate.

Further, the surface of the perforated steel plate is coated with epoxy resin for anchoring.

Further, the height of the perforated steel plate is not greater than the vertical distance between the tension reinforcement mesh and the compression reinforcement mesh;

The effective height of the concrete slab is the distance from the top of the slab to the tensile reinforcement mesh.

Further, the length of the perforated steel plate is greater than the effective height of the concrete slab.

Further, the perforated steel plate is wavy or broken line.

Further, the opening diameter of the perforated steel plate is larger than the particle size of the concrete coarse aggregate;

The perforations of the perforated steel plate are arranged in two rows up and down, and the holes in the two rows of up and down are dislocated.

Compared with the prior art, the present invention has the following beneficial effects:

A punching-resistant reinforced concrete slab-column joint. Compared with traditional bent steel bars, stirrups, and anchor bolts, the perforated steel plate is a continuum on the punching failure surface of the reinforced concrete slab-column joint, and the perforated steel plate runs through Throughout the punching cracks, the perforated steel plate can fully bear the force, slow down the cracking of the concrete, play its punching resistance performance more efficiently, and significantly improve the punching shear bearing capacity of the reinforced concrete slab-column joint. The invention has simple structure, convenient installation, no interference to the tensile steel mesh and compression steel mesh during installation, easy positioning, can be prefabricated in the factory in advance to shorten the construction period, and effectively improves the punching resistance performance of the reinforced concrete slab-column joint.

Further, the pattern on the surface of the steel plate can enhance the contact with the concrete.

Further, the surface of the perforated steel plate is coated with epoxy resin for anchoring.

Furthermore, the higher the height of the perforated steel plate, the thicker the thickness, the more the number of placed, the higher the punching resistance bearing capacity.

Description of drawings

Fig. 1 is a schematic diagram of a steel plate, Fig. 1 (a) is a steel plate without perforations, and Fig. 1 (b) is a perforated steel plate;

Fig. 2 is a three-dimensional schematic diagram (radial arrangement) of punching-shear-resistant opening steel plates in reinforced concrete slab-column joints;

Fig. 3 is a schematic diagram of punching-resistant reinforced concrete slab-column joints (radial arrangement);

Figure 4 is a section view of the punching-resistant reinforced concrete slab-column joint (radial arrangement);

Fig. 5 is a schematic diagram of a punching-resistant reinforced concrete slab-column joint (orthogonal arrangement);

Figure 6 is a schematic diagram of punching-resistant reinforced concrete slab-column joints (orthogonal-radial hybrid arrangement);

Fig. 7 is the load-displacement curve after finite element analysis of reinforced concrete slab-column joints without perforated steel plates and punching shear.

Among them: 1-concrete slab; 1-1-tensile reinforcement mesh; 1-2-compression reinforcement mesh; 2-concrete column; 2-1-column longitudinal reinforcement; 2-2-column stirrup; 3-opening steel plate.

Detailed ways

In order to enable those skilled in the art to better understand the solutions of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the drawings in the embodiments of the present invention. Obviously, the described embodiments are only It is an embodiment of a part of the present invention, but not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts shall fall within the protection scope of the present invention.

It should be noted that the terms "first" and "second" in the description and claims of the present invention and the above drawings are used to distinguish similar objects, but not necessarily used to describe a specific sequence or sequence. It is to be understood that the data so used are interchangeable under appropriate circumstances such that the embodiments of the invention described herein can be practiced in sequences other than those illustrated or described herein. Furthermore, the terms "comprising" and "having", as well as any variations thereof, are intended to cover a non-exclusive inclusion, for example, a process, method, system, product or device comprising a sequence of steps or elements is not necessarily limited to the expressly listed instead, may include other steps or elements not explicitly listed or inherent to the process, method, product or apparatus.

The present invention is described in further detail below in conjunction with accompanying drawing:

Please refer to Figures 1-6, the present invention provides a technical solution: a punching-resistant reinforced concrete slab-column node, including a concrete slab 1, a tensile reinforcement mesh 1-1, a compression reinforcement mesh 1-2, and a concrete column 2. Column longitudinal reinforcement 2-1, column stirrup 2-2 and perforated steel plate 3, and the perforated steel plate 3 is placed vertically in the concrete slab 1. Fig. 1 is a schematic diagram of a perforated steel plate, and a plurality of through holes are opened on the steel plate.

Referring to Fig. 1, Fig. 1(a) is a steel plate without perforation, and Fig. 1(b) is a perforated steel plate. It can be seen that there are two rows of dislocated through holes distributed on the perforated steel plate.

Referring to Fig. 2, Fig. 3 and Fig. 4, Fig. 2 is a schematic diagram of a three-dimensional structure of a reinforced concrete slab-column joint with perforated steel plates placed radially, Fig. 3 is a top view of the slab-column joint area, and Fig. 4 is a cross-sectional view of the slab-column joint area; A steel plate with punching shear resistance includes a concrete slab, the upper and lower sides of the concrete slab 1 are tension reinforcement mesh 1-1 and compression reinforcement mesh 1-2 respectively, and the concrete column 2 includes column hoops 2-2 and column longitudinal reinforcement 2-1, the longitudinal steel bar 2-1 between the tension steel mesh 1-1 and the compression steel mesh 1-2 is provided with a perforated steel plate 3, and a plurality of perforated steel plates 3 are surrounded by the concrete column 2 At its periphery, perforated steel plates 3 are placed vertically inside the concrete slab 1 .

The placement of the perforated steel plates 3 can be arranged in an orthogonal manner, as shown in FIG. 5 ; it can also be arranged in a mixed orthogonal-radial manner, as shown in FIG. 6 . The number and thickness of the perforated steel plates 3 can be adjusted.

When the present invention is manufactured, it can be formed according to the following operations: the formwork is supported at the bottom of the plate, the bending steel bars at the bottom of the plate are bound, the prefabricated perforated steel plate is placed in a designated position and fixed, and then the bending steel bars at the top of the plate are bound, and the After the rest of the steps are complete, pour the concrete.

See Figure 7. Figure 7 shows the load-displacement curves of reinforced concrete slab-column joints without and with punching resistance simulated by the finite element method. The numerical simulation results show that the failure displacement of the reinforced concrete slab-column joints with open-hole steel plates is Increased, the ultimate bearing capacity increased, and the punching resistance increased by 41%. The more the number of perforated steel plates is placed, the thicker the thickness, the higher the height, and the higher the bearing capacity. The invention well improves the punching shear bearing capacity of reinforced concrete.

The above content is only to illustrate the technical ideas of the present invention, and cannot limit the protection scope of the present invention. Any changes made on the basis of the technical solutions according to the technical ideas proposed in the present invention shall fall within the scope of the claims of the present invention. within the scope of protection.

Claims (8)

1. A punching-resistant reinforced concrete slab column node is characterized in that, comprising a concrete slab (1), the bottom of the concrete column (2) is positioned in the concrete slab (1), and the periphery of the concrete column (2) bottom is provided with A plurality of perforated steel plates (3), the perforated steel plates (3) are vertically arranged in the concrete slab (1). 2. The punching-resistant reinforced concrete slab-column node according to claim 1, characterized in that, the upper and lower sides of the concrete slab (1) are respectively provided with a tension reinforcement mesh (1-1) and a compression reinforcement net(1-2); The perforated steel plate (3) is located between the tension reinforcement mesh (1-1) and the compression reinforcement mesh (1-2). 3. The punching-resistant reinforced concrete slab-column joint according to claim 1, characterized in that, the surface of the perforated steel plate (3) is provided with a patterned steel plate. 4. The punching-resistant reinforced concrete slab-column joint according to claim 1, characterized in that epoxy resin is applied on the surface of the perforated steel plate (3) for anchoring. 5. the reinforced concrete slab-column node of punching resistance according to claim 1, is characterized in that, the height of described perforated steel plate (3) is not greater than tension reinforcement mesh and compression reinforcement mesh vertical distance; The effective height of the concrete slab (1) is the distance from the top of the slab to the tensile reinforcement mesh (1-1). 6. The punching-resistant reinforced concrete slab-column joint according to claim 1, characterized in that the length of the perforated steel plate (3) is greater than the effective height of the concrete slab (1). 7. The punching-resisting reinforced concrete slab-column joint according to claim 1, characterized in that the perforated steel plate (3) is wave-shaped or broken-line. 8. the reinforced concrete slab-column node of punching resistance according to claim 1, is characterized in that, the aperture diameter of described perforated steel plate (3) is greater than concrete coarse aggregate particle diameter; The perforations of the perforated steel plate (3) are arranged in two rows up and down, and the holes in the two rows of up and down are arranged in dislocation.

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