CN102635177A - A kind of unbonded hidden support reinforced concrete frame shear wall and its construction method - Google Patents

Abstract

The invention relates to a non-bonded hidden support reinforced concrete frame shear wall, and belongs to the technical field of structural engineering. The shear wall plate comprises an edge beam, edge columns and a shear wall plate which are fixedly connected together, wherein the shear wall plate comprises a hidden support steel structure and reinforcing steel bar meshes which are distributed on two sides of the hidden support steel structure, and the hidden support steel structure and the reinforcing steel bar meshes form the shear wall plate by pouring concrete; two ends of the hidden support steel structure are fixedly connected with the frame; the method is characterized in that a non-anchoring part of the hidden support steel structure is provided with a non-bonding layer. The invention effectively improves the problems of insufficient ductility and poor integrity of the concrete shear wall, and simultaneously avoids the problems of the hidden support that the concrete is pulled apart and the hidden support is not anchored sufficiently at the end part, so that the whole system has better ductility and integrity, simple structure, convenient construction and better economic performance.

Description

A kind of unbonded hidden support reinforced concrete frame shear wall and its construction method

technical field

The invention relates to a new type of reinforced concrete composite shear wall with concealed support, which is developed on the basis of traditional type steel concealed braced reinforced concrete shear wall, in particular to a type of reinforced concrete composite shear wall with strong anchorage and unbonded concealed support, which belongs to technical field of structural engineering.

Background technique

The seismic capacity of buildings has become a key structural issue that has attracted much attention in recent years. Reinforced concrete shear wall is a traditional seismic component of building structure, which is suitable for various structural types such as shear wall structure, frame-shear wall structure, and frame-core tube structure. Shear walls can bear most of the earthquake action due to their large lateral stiffness. However, the ductility of the shear wall is poor, and once it cracks, it will produce a large stiffness reduction effect, which has a great impact on the overall stability of the structure. The existing improvement schemes using concealed support adopt the form of reinforced concealed support or "section steel-rebar" concealed support. Although the constraints of the concrete core beam are set around the steel plate support, the problem of out-of-plane buckling instability of the steel plate is prevented, but Due to the strong combination of the steel plate and the surrounding confined concrete, when the steel plate is pulled, the confined concrete is easy to crack, which has a great impact on the overall stability of the shear wall; on the other hand, the insufficient anchorage of the hidden support at the end may cause Localized damage at the end.

Contents of the invention

The object of the present invention is to solve the problems in the prior art, and propose a non-bonding concealed support reinforced concrete frame shear wall and its construction method. The invention can solve the problem of cracking of restrained concrete under tension while ensuring good ductility index and comprehensive seismic performance of the shear wall, optimizes the structural design of the concealed support shear wall, and improves the durability of the shear wall.

Technical scheme of the present invention is as follows:

An unbonded concealed braced reinforced concrete composite frame shear wall of the present invention includes side beams 1, side columns 5 and shear wall panels fixed together, and the shear wall panels include hidden braced steel structures and distributed The reinforcement mesh on both sides of the concealed support steel structure, the two form shear wall panels by pouring concrete; the two ends of the concealed support steel structure are affixed to the frame; it is characterized in that the non-anchor position of the concealed support steel structure is set With or without adhesive layer 13 .

The non-adhesive layer 13 of the present invention is provided with a plastic film or plastic foam at the non-anchor position of the hidden supporting steel structure.

The concealed support steel structure of the present invention is a diagonal support 12 made of steel plates, I-shaped steel or H-shaped steel, with shear connectors 4 welded at both ends, and the upper and lower ends of the diagonal support 12 are respectively placed inside the frame, and are poured Concrete is fixed to the frame.

The shape of the diagonal support in the present invention is X shape, herringbone or figure eight.

A kind of construction method of unbonded concealed support reinforced concrete composite frame shear wall of the present invention is characterized in that, the method comprises the following steps:

a. Complete the fabrication of the concealed support steel structure, weld the shear connectors at the anchorage area, and add a non-adhesive layer on the surface of the non-anchor area;

b. Bind the steel bars of the side columns and side beams, install the hidden supporting steel structure in place, and bind the steel mesh on both sides;

c. Support temporary formwork and pour concrete.

The unbonded concealed support reinforced concrete frame shear wall of the present invention and its construction method have the following advantages:

Effectively improve the problems of insufficient ductility and poor integrity of concrete shear walls, and at the same time avoid the problems of hidden support cracking concrete and insufficient anchoring of hidden supports at the end, so that the whole system has better ductility and integrity, simple structure, and easy construction It is convenient and economical.

Description of drawings

Fig. 1 is a structural representation of the present invention;

Fig. 2 is A-A sectional view among Fig. 1;

Fig. 3 is B-B sectional view among Fig. 1;

Fig. 4 is C-C sectional view among Fig. 1;

Fig. 5-7 is the inclined support schematic diagram that adopts H-shaped steel to form among the present invention;

In the figure: 1-edge beam; 2-beam longitudinal reinforcement; 3-beam stirrup; 4-shear connector; 5-side column; 6-column longitudinal reinforcement; 7-rectangular stirrup; 8-octagonal stirrup Reinforcement; 9-shear wall panel; 10-vertical distribution reinforcement of wall panel; 11-horizontal distribution reinforcement of wall panel; 12-diagonal support; 13-no adhesive layer;

Detailed ways

Below in conjunction with accompanying drawing, structure of the present invention, construction process are described further.

A kind of unbonded concealed support reinforced concrete frame shear wall of the present invention is shown in Fig. 1, Fig. 2, Fig. 3, Fig. 4. The frame shear wall includes side beams 1 , side columns 5 , longitudinal bars 2 , rectangular stirrups 3 , frames of octagonal stirrups and shear wall panels 9 fixed together. In the frame described above, the side beam 1 has a rectangular cross-section, and the reinforcement is arranged with longitudinal reinforcement 2 at equal distances on each side, and rectangular stirrups 3 are arranged at certain intervals along the longitudinal reinforcement of the beam, and are evenly distributed to the beam end. The side column 5 has a rectangular cross-section, and the longitudinal reinforcement 6 is arranged equidistantly on each side, and the rectangular stirrups 7 and octagonal stirrups 8 are arranged at certain intervals along the longitudinal reinforcement of the beam, evenly distributed to the end of the column. The shear wall panel 9 includes a hidden supporting steel structure and two pieces of steel mesh, both of which form a shear wall panel by pouring concrete; the two ends of the hidden supporting steel structure are fixed with the frame; Horizontally distributed steel bars 11 and vertically distributed steel bars 10 are evenly arranged in the direction of distribution, and are bound and fixed at the intersection points, located on both sides of the hidden support steel structure, and the upper and lower distributed steel bars of the steel mesh are respectively inserted into the side beams 1 and side columns 5 of the frame, And to ensure a certain anchorage length, between the two pieces of steel mesh, the tensioned steel bar 14 is used for tensioning. The above-mentioned technical features are the same as those of the prior art and will not be described below.

The innovation of the present invention mainly lies in the improvement of the concealed support steel structure, especially the non-adhesive layer 13 is provided at the non-anchor position of the concealed support steel structure to isolate the contact between the concealed support steel structure and the concrete. Compared with the existing concealed support shear wall, it can solve the problem of restrained concrete cracking under tension while ensuring that the shear wall achieves better ductility index and comprehensive seismic performance, and optimizes the structural design of the concealed support shear wall , to improve the durability of the shear wall.

The non-adhesive layer 13 provided at the non-anchor position of the above-mentioned hidden supporting steel structure can be formed by covering plastic film, wrapping thin plastic foam or spraying paint.

The above-mentioned concealed support steel structure is a diagonal support 12 composed of steel plate, I-shaped steel or H-shaped steel (as shown in Figures 5 to 6), and the upper and lower ends of the diagonal support are welded with shear connectors 4, placed in the frame Inside (that is, the upper and lower ends of the oblique support extend into the upper and lower side beams 1 respectively), then the anchorage is formed by pouring concrete and the frame.

Above-mentioned oblique support 12 can be X shape (as shown in Figure 1) or herringbone, figure-of-eight, is equally applicable to the multiple groups of hidden support forms of herringbone oblique support, figure-of-eight oblique support and rectangular wallboard, no longer figure Show enumeration.

The construction method of the reinforced concrete frame shear wall with unbonded hidden support of the present invention is as follows: the built-in hidden support (steel plate or section steel) 12 is made in the factory, and an unbonded layer 13 is added on the surface, and the anchorage Area welded shear connectors 4. At the construction site, the steel bars of the side column 5 and the side beam 1 are bound first, and after the hidden support (steel plate or section steel) 12 is installed on site, the vertically distributed steel bars 10 and the horizontally distributed steel bars 11 are bound on both sides to form a steel bar Net, pouring concrete, thus forming a strong anchor unbonded built-in steel plate (steel) concealed support shear wall as shown in the figure.

The strong anchoring and non-bonding concealed support composite shear wall adopted in the present invention can effectively improve the problems of insufficient ductility and poor integrity of the concrete shear wall, and at the same time avoid the problems of the concealed support cracking the concrete and the insufficient anchoring of the concealed support at the end. The whole system has better ductility and integrity, simple structure, convenient construction, and better economic performance.

Claims (8)

1. one kind is not had the dark bearing bar concrete group frame shear wall of bonding; This frame-shear wall comprises side bar (1), side column (5) and the shear wall slab that is fixed together; Described shear wall slab comprises dark support steel structure and the steel mesh reinforcement that is distributed in dark support steel structure both sides, and both form shear wall slab through concreting; The two ends and the framework of dark support steel structure are affixed; It is characterized in that non-anchoring place of described dark support steel structure is provided with no adhesive linkage (13).

2. frame-shear wall according to claim 1 is characterized in that, described no adhesive linkage (13) is provided with plastic sheeting or plastic foam for non-anchoring place at dark support steel structure.

3. frame-shear wall according to claim 1 and 2; It is characterized in that; Described dark support steel structure is the bearing diagonal (12) that steel plate, i shaped steel or H shaped steel constitute; Its two ends are welded with shear connector (4), and bearing diagonal (12) two ends up and down places framework inner respectively, and affixed through concreting and framework.

4. frame-shear wall according to claim 3 is characterized in that, described bearing diagonal be shaped as X-shaped, herringbone or splayed.

One kind do not have the bonding dark bearing bar concrete group frame shear wall job practices, it is characterized in that this method may further comprise the steps:

A. dark support steel structure is completed, locate the welding shearing connector in the anchorage zone, and increase adhesive-less layer on surface, non-anchorage zone;

B. the reinforcing bar of colligation side column and side bar is with dark support steel structure installation in position, at its both sides assembling reinforcement net;

C. prop up temporary formwork, concreting.

6. job practices according to claim 5 is characterized in that, described no adhesive linkage is that non-anchoring place of dark support steel structure is provided with plastic sheeting or plastic foam.

7. job practices according to claim 5 is characterized in that, described dark support steel structure is the bearing diagonal that steel plate, i shaped steel or H shaped steel constitute.

8. job practices according to claim 7 is characterized in that, described bearing diagonal be shaped as X-shaped, herringbone or splayed.

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