Construction method of opening-narrowed stirrup-connected two-way evacuated plate laminated shear wall

Abstract

The invention belongs to the technical field of civil engineering concrete laminated shear wall building structures, and particularly relates to a construction method of a bidirectional evacuation plate laminated shear wall connected by opening narrowing stirrups. The opening narrowing stirrups corresponding to the horizontal holes of the two-way evacuating plate are arranged at the edge components at the two ends of the shear wall, and the in-wall distribution longitudinal bars and the edge component longitudinal bars are arranged at the corresponding positions of the vertical holes of the two-way evacuating plate and the opening narrowing stirrups respectively, so that the structure can meet the design requirement, and construction is facilitated; due to the special structure of the opening narrowing stirrup, the restraining area of the opening narrowing stirrup on the concrete in the core area can be adjusted and controlled through the included angle formed by the longitudinal section and the horizontal section, the restraining effect of the opening narrowing stirrup on the concrete in the core area is gradually reduced towards the opening end, and a vertical energy dissipation area can be formed under large horizontal lateral movement; the structural damage mode and the energy consumption mode are effectively regulated and controlled, and the unity of constructability, good economical efficiency and anti-seismic performance of the novel superimposed shear wall structure is achieved.

Description

Technical Field

[0001] The invention belongs to the technical field of civil engineering concrete composite shear wall building structures, and in particular relates to a construction method of a bidirectional evacuated slab composite shear wall connected by opening narrowed stirrups. Background Art

[0002] Nowadays, shear wall structures are mainly used in construction projects such as high-rise and low-rise residential buildings. Compared with traditional cast-in-place shear walls, composite shear wall structures greatly reduce on-site wet operations, improve construction speed and quality, and increase the effective utilization rate of building materials. In addition, composite shear wall structures also have production standardization, modularization, and building industrialization, and can form a standardized system from design to construction, which is in line with the development direction of building industrialization.

[0003] As a configuration of precast wall panels, bidirectional evacuation, with its vertical and horizontal penetration, effectively avoids problems such as loose vibration and cavities in post-cast concrete. Furthermore, the interaction between the concrete connecting ribs in the intermediate cavity and the post-cast concrete enables the cast-in-place and precast layers to work together. For bidirectional evacuation composite shear walls, there are two options: externally extending horizontal reinforcement and non-extension horizontal reinforcement. While externally extending horizontal reinforcement ensures the reliability of the shear wall connection at the constrained edge members and the integrity of the shear wall, it increases construction complexity during precast component production and transportation, causing some of the externally extending reinforcement to yield or even undergo irreversible permanent deformation, making it difficult to achieve the desired design goals. For the non-extension horizontal reinforcement method, if traditional rectangular closed stirrups are still used, it is difficult to meet the reinforcement design requirements for the connection between the cast-in-place edge members and the bidirectional evacuation slab, making it impossible to ensure the constructability of the composite shear wall, especially the reliability of the joints. This leads to poor integrity of the shear wall, which in turn reduces the shear wall's bearing capacity and seismic performance.

[0004] Therefore, it is urgent to design a new connection design to improve the integrity, bearing capacity and seismic performance of the two-way evacuated plate composite shear wall. Summary of the Invention

[0005] In order to solve the problem that the reinforcement design requirements at the connection between the cast-in-place edge components and the two-way evacuation plates are difficult to meet, the present invention provides a construction method for a two-way evacuation plate composite shear wall connected by open narrowing stirrups. By arranging open narrowing stirrups corresponding to the horizontal holes of the two-way evacuation plates at the edge components at both ends of the shear wall, the special structure of the open narrowing stirrups improves the reliability of the joints and the reinforcement design structure at the connection between the cast-in-place edge components and the two-way evacuation plates, effectively improving the integrity, bearing capacity and seismic performance of the two-way evacuation plate composite shear wall, and meeting the constructability of the new two-way evacuation plate composite shear wall.

[0006] As a secondary improvement, the shear wall in the existing technology is the main lateral-resisting member. In the design, its main materials such as steel bars and concrete have problems of excessive strength and rigidity, and mainly rely on the strength of the material itself to resist external loads. The bidirectional hollowed-out plate composite shear wall connected by the open narrowing stirrups obtained by the construction method of the present invention has a gradually narrowing effect of the open narrowing stirrups on the core area concrete due to the open narrowing stirrups gradually narrowing from the closed end to the open end. This effect is reflected under a large horizontal lateral displacement, and the maximum stress position of the structure gradually shifts to the open end of the open narrowing stirrups, resulting in the formation of a vertical energy dissipation zone between the middle of the open narrowing stirrups and the open end, and then generating a small slip at the joint, avoiding shear brittle failure, and realizing the innovation of the shear wall connection method and ductile design.

[0007] The present invention provides a construction method for a bidirectional evacuated slab composite shear wall connected by opening narrowed stirrups, the specific steps of which are as follows: First, the distributed longitudinal reinforcement in the wall and the longitudinal reinforcement of the edge components are set, and then the two-way evacuated plate is hoisted to the distributed longitudinal reinforcement in the wall and the longitudinal reinforcement of the edge components. During the process, the position of the vertical hole remains corresponding to the corresponding distributed longitudinal reinforcement in the wall or the longitudinal reinforcement of the inner edge components. During the hoisting process, open narrowing stirrups are symmetrically set in the edge components on both sides of the end of the two-way evacuated plate composite shear wall. When the two-way evacuated plate is hoisted, the open narrowing stirrups are inserted from the horizontal holes at the end of the two-way evacuated plate, and the open narrowing stirrups are set at the corresponding positions of the longitudinal reinforcement of the edge components. After the hoisting of the two-way evacuated plate is completed, the open narrowing stirrups are tied and fixed to the longitudinal reinforcement of the edge components; finally, concrete is poured integrally at the end edge components and the cavity of the two-way evacuated plate.

[0008] More specifically, the construction method of the bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups includes the following steps: 1) Using a bidirectional evacuated plate as the side form of the shear wall, the bidirectional evacuated plate is provided with concrete ribs, and horizontal holes and vertical holes are formed between the concrete ribs; Preferably, horizontal steel bars and tension bars are preset in the two-way evacuated plate to resist shear damage, while meeting the requirements of transportation and lifting. In addition, the two-way evacuated plate can serve as a formwork to reduce the use of formwork, especially the use of traditional wooden formwork.

[0009] 2) In the second vertical hole of the two-way evacuated plate, the inner edge member longitudinal reinforcement is arranged in the first vertical holes at both ends, and the middle edge member longitudinal reinforcement and the outer edge member longitudinal reinforcement are arranged on the outside of the two ends. The two opposite middle edge member longitudinal reinforcements are connected and tied together by the first horizontal reinforcement. Then, open narrowing stirrups are arranged at the corresponding transverse ends. The open narrowing stirrups have one end open and the other end closed. The open end includes a bent section and a straight section after bending. The inner edge member longitudinal reinforcement is limited between the bent section and the straight section after bending. The middle edge member longitudinal reinforcement and the outer edge member longitudinal reinforcement are respectively arranged at the middle of the horizontal section of the open narrowing stirrup and at the two corners of the closed end. The outer edge member longitudinal reinforcement, the middle edge member longitudinal reinforcement and the open narrowing stirrup are tied together at the contact points. The inner edge member longitudinal reinforcement is tightened and fixed by the hooks of the open narrowing stirrups. By arranging distributed longitudinal reinforcement in the wall and longitudinal reinforcement of the edge members at the vertical holes and edge members of the two-way evacuation plate, it helps to resist bending damage. The open ends of the open narrowing stirrups arranged at both ends extend into the first vertical hole of the two-way evacuation plate, and are connected to the longitudinal reinforcement of the inner edge member of the first vertical hole through their bent sections and straight sections after bending, thereby realizing an effective connection between the edge member and the two-way evacuation plate.

[0010] 3) Concrete is poured inside and at both ends of the two-way evacuated slab to obtain a two-way evacuated slab composite shear wall connected by opening narrowing stirrups; The edge members and the bidirectional evacuated slabs are connected by the narrowing stirrups, which can be loaded synergistically. The bidirectional evacuated slabs and the post-cast concrete work together due to the interaction between the concrete ribs and the surrounding concrete. As the narrowing stirrups gradually narrow toward the open end, their restraining effect on the core concrete gradually decreases. This effect is reflected under large horizontal lateral displacements, as the maximum load position of the structure gradually shifts toward the open end of the narrowing stirrups. This in turn generates slight slip at the joints, forming a vertical energy dissipation channel, avoiding shear brittle failure, and providing a certain degree of protection for the edge members.

[0011] One end of the open narrowing stirrup is closed and provided with two opposite corners, and the other end is open. The open end is provided with an outward bending section and a straight section after bending. The inner edge member longitudinal reinforcement and the outer edge member longitudinal reinforcement are respectively limited to the bending section of the open narrowing stirrup, the inside of the straight section after bending and the two corners of the closed end; two middle edge member longitudinal reinforcements connected by a first horizontal tie bar are also provided between the open end and the closed end, and the outer edge member longitudinal reinforcement and the middle edge member longitudinal reinforcement are tied and fixed at the contact points with the open narrowing stirrup.

[0012] More specifically, the opening narrowing stirrup is made of a steel bar through continuous bending, including a longitudinal section and horizontal sections connected to the longitudinal section at both ends, and gradually narrows inward from the closed end to the open end; the other end of the horizontal section is bent outward to form a bent section and a straight section after bending, forming an opening narrowing stirrup structure.

[0013] The bidirectional evacuated slab composite shear wall is provided with various types of steel bars, which together with the bidirectional evacuated slab and post-cast concrete form the bidirectional evacuated slab composite shear wall.

[0014] Preferably, one end of the horizontal section of the open narrowing stirrup is connected to the longitudinal section and forms an angle of 70-80° with the longitudinal section, and the other end of the horizontal section is bent outward to form a bent section and a straight section after bending, and the length of the straight section after bending is the larger value of 10 times the diameter of the open narrowing stirrup and 75 mm.

[0015] The diameters of each section of the opening narrowing stirrups remain consistent and gradually narrow toward the opening end.

[0016] The angle and the length of the straight section after bending are set within the above range. The purpose is to standardize the production of open narrowing stirrups, and through the angle, effective regulation of the restraint effect of the open narrowing stirrups on the core area concrete is achieved.

[0017] The edge member longitudinal reinforcement includes inner edge member longitudinal reinforcement, middle edge member longitudinal reinforcement and outer edge member longitudinal reinforcement; the inner edge member longitudinal reinforcement is arranged in the area surrounded by the bent section, the straight section after bending and the horizontal section of the opening narrowing stirrup, the outer edge member longitudinal reinforcement is arranged at the angle between its horizontal section and the longitudinal section, the middle edge member longitudinal reinforcement is arranged on the inner side of the horizontal section and abuts against the horizontal section, the contact points of the outer edge member longitudinal reinforcement, the middle edge member longitudinal reinforcement and the opening narrowing stirrup are fixed by binding with metal wire, and the inner edge member longitudinal reinforcement is tightened and fixed by the bent hooks of the opening narrowing stirrup.

[0018] A first horizontal reinforcement is provided between the two middle edge member longitudinal reinforcements corresponding to the opening narrowing stirrups, and is tied and fixed at the contact points between the opening narrowing stirrups and the outer edge member longitudinal reinforcements and the middle edge member longitudinal reinforcements.

[0019] The longitudinal reinforcements of the middle edge members are connected by first horizontal reinforcements, and the longitudinal reinforcements of the middle edge members are in contact with the horizontal sections of the opening narrowing stirrups and are fixed by binding with metal wires.

[0020] The bidirectional evacuated plate composite shear wall includes a bidirectional evacuated plate and post-cast concrete inside and at both ends thereof. Edge members are provided on both sides of the bidirectional evacuated plate and at the ends of the post-cast concrete. The bidirectional evacuated plate includes a first concrete plate and a second concrete plate arranged opposite to each other. The edge members include longitudinal edge member reinforcements embedded in the post-cast concrete and open narrowing stirrups arranged in the horizontal direction. There are multiple open narrowing stirrups distributed in the vertical direction, and the open narrowing stirrups are symmetrically arranged inside the post-cast concrete at the ends of both sides of the bidirectional evacuated plate composite shear wall.

[0021] The transverse length of the first concrete slab is slightly greater than that of the second concrete slab. After installation, the first concrete slab and the second concrete slab are symmetrically arranged on the outside of the wall.

[0022] There are two longitudinal reinforcements in the middle edge member on each side of the bidirectional evacuated plate. A first horizontal reinforcement is provided corresponding to the longitudinal reinforcement of the middle edge member. The first horizontal reinforcement corresponds one-to-one to the opening narrowing stirrups. The longitudinal reinforcement of the middle edge member is tied and fixed to the first horizontal reinforcement on the inner side of the opening narrowing stirrups.

[0023] Preferably, multiple groups of concrete ribs are arranged in the horizontal and vertical directions between the two opposite first concrete slabs and the second concrete slabs of the bidirectional evacuation plate. Preferably, the concrete ribs are arranged at fixed intervals in the horizontal and vertical directions, vertical holes are formed between the concrete ribs in the horizontal direction, and horizontal holes are formed between the concrete ribs in the vertical direction. One end of the bent section of the open narrowing stirrup extends into the horizontal hole at the end of the bidirectional evacuation plate, and the inner edge member longitudinal reinforcement is arranged in the first vertical holes at the transverse ends of the bidirectional evacuation plate. One side of the longitudinal section of the open narrowing stirrup, the middle edge member longitudinal reinforcement and the outer edge member longitudinal reinforcement are all arranged on the outside of the two ends of the bidirectional evacuation plate.

[0024] The first horizontal reinforcement at the edge member is used in conjunction with the open narrowing stirrups to improve the restraint capacity of the shear wall edge member steel bars and core area concrete, and improve the problem of the edge member longitudinal reinforcement being detached under the action of a larger earthquake, making it difficult to exert its tensile strength.

[0025] More preferably, the number of the horizontal holes is ≥7, and among the 2-3 horizontal holes from top to bottom and the 2-3 horizontal holes from bottom to top, two groups of open narrowing stirrups are respectively arranged on both sides of each horizontal hole, and one group of open narrowing stirrups is respectively arranged on both sides of the remaining horizontal holes.

[0026] Since the upper and lower ends of the wall are subjected to greater forces when shear failure occurs in the actual structure, the present invention sets stirrup reinforcement densification areas at the upper and lower ends of the two-way hollowing plate, and sets multiple groups of corresponding open narrowing stirrups at the horizontal holes at the top and bottom to improve the bearing capacity of the wall.

[0027] More preferably, the number of the vertical holes is ≥3, including the outermost first vertical holes at the two ends and at least one second vertical hole between the two first vertical holes, inner edge member longitudinal reinforcements are arranged in the vertical direction in the first vertical holes, two wall distributed longitudinal reinforcements are arranged opposite to each other in the vertical direction in each second vertical hole, the second horizontal tension reinforcement connects the two opposite wall distributed longitudinal reinforcements on the inner side of the second vertical hole, and the contact between the wall distributed longitudinal reinforcement on the inner side of the second vertical hole and the second horizontal tension reinforcement is fixed with metal wire.

[0028] The top ends of the edge member longitudinal reinforcement and the wall distributed longitudinal reinforcement arranged in the second vertical hole pass through the top surface of the two-way evacuated plate.

[0029] Through the interaction between the concrete ribs and the surrounding post-cast concrete, the open ends of the open-narrowing stirrups extend into the horizontal holes of the bidirectional evacuated slab and connect to the internal wall, ensuring the integrity of the edge components and internal wall, and synergistically resisting earthquake effects under small lateral displacements. As the open-narrowing stirrups gradually narrow toward the open ends, the restraining effect of the open-narrowing stirrups on the core concrete gradually decreases. This effect is reflected under large horizontal lateral displacements, and the maximum stress position of the structure gradually shifts toward the open ends of the open-narrowing stirrups, resulting in a vertical energy dissipation zone between the middle and open ends of the open-narrowing stirrups, which in turn generates slight slip at the joints. This not only avoids major shear failure in the structure, but also protects the edge components of the structure.

[0030] After the various types of steel bars of the edge components are installed, they are cast in situ as a whole to form post-cast concrete.

[0031] Preferably, tie bars are embedded inside the concrete ribs, and horizontal steel bars are correspondingly arranged in the first concrete slab and the second concrete slab. The tie bars are integrally connected to the horizontal steel bars, and the horizontal steel bars are embedded inside the first concrete slab and the second concrete slab. Their function is to connect the tie bars in the concrete ribs to the horizontal steel bars in the first concrete slab and the second concrete slab, so that the steel bars in the bidirectional evacuated slab are woven into one and bear the force together.

[0032] Preferably, a steel mesh is provided inside the first concrete slab and the second concrete slab, and the steel mesh is buried inside the first concrete slab and the second concrete slab.

[0033] The function of the steel wire mesh is to enhance the crack resistance of the bidirectional evacuation plate, thereby preventing cracks from occurring during transportation and affecting the normal use of the bidirectional evacuation plate.

[0034] The bidirectional evacuation plate is prefabricated and is made by integrally pouring concrete and by bidirectional core pulling.

[0035] Furthermore, the open narrowing stirrups are not only applicable to the planar structural system of the I-shaped rectangular cross-section shear wall, but also applicable to the L-shaped corner wall with spatial force effect. Specifically, longitudinal reinforcements and rectangular closed stirrups are additionally arranged in the outward direction of the longitudinal reinforcements of the edge members. The outer edge member longitudinal reinforcements and the middle edge member longitudinal reinforcements are limited at the two corners of the rectangular closed stirrups, and the remaining two corners of the rectangular closed stirrups are limited by the additional longitudinal reinforcements.

[0036] Open-ended narrowing stirrups can be used in conjunction with rectangular closed stirrups. In the principal direction, the use of open-ended narrowing stirrups is consistent with the planar structural system of a U-shaped rectangular shear wall, with rectangular closed stirrups used in the out-of-plane direction. The combination of open-ended narrowing stirrups, traditional rectangular closed stirrups, and longitudinal reinforcement in edge members can also ensure the shear wall's bearing capacity and ductility.

[0037] Compared with the prior art, the present invention has the following beneficial effects: The present invention provides a construction method for a bidirectional evacuated slab composite shear wall connected by open narrowing stirrups. By installing open narrowing stirrups within the edge members on both ends of the bidirectional evacuated slab composite shear wall, with one end of the open narrowing stirrup with a hook extending into the bidirectional evacuated slab, and installing longitudinal reinforcement of the edge members at corresponding positions of the open narrowing stirrups, this method solves the construction difficulties of bidirectional evacuated slab composite shear walls and achieves a new composite shear wall structure that combines constructability with excellent economic efficiency and seismic performance.

[0038] Furthermore, compared with the connection method of using additional U-shaped bars for prefabricated wall panels without reinforcement and cast-in-place parts in the project, the connection method of using open narrowed stirrups can reduce the amount of steel used in the structure, save material costs, and contribute to the low-carbon and green development of building structures.

[0039] Furthermore, by setting longitudinal reinforcement of edge members at the corresponding positions of the opening narrowing stirrups and using them in conjunction with tension reinforcement, the bearing capacity of the edge restraint members of the bidirectional hollowed-out plate composite shear wall structure can be effectively ensured, thereby ensuring an effective path for the transmission of structural force flow.

[0040] Furthermore, the bidirectional hollowed-out slab composite shear wall connected by open narrowing stirrups gradually narrows toward the open end, so that the restraining effect of the open narrowing stirrups on the core area concrete gradually decreases. This effect is reflected under large horizontal lateral displacement, and the maximum stress position of the structure gradually shifts toward the open end of the open narrowing stirrups, resulting in the formation of a vertical energy dissipation zone between the middle of the open narrowing stirrups and the open end, and then generating a small slip at the joint, realizing the innovation of the shear wall connection method and ductile design as well as the effective regulation of the failure mode and energy dissipation method. BRIEF DESCRIPTION OF THE DRAWINGS

[0041] Figure 1 This is a three-dimensional schematic diagram of the bidirectional evacuated plate composite shear wall connected by opening narrowing stirrups before and after casting of the present invention, wherein Figure 1 A is before concrete pouring, Figure 1 B is after concrete pouring; Figure 2 (A) Bottom enlarged view and (B) actual view of the bidirectional evacuated slab composite shear wall connected with opening narrowing stirrups of the present invention; Figure 3The planar reinforcement diagram of the bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups of the present invention; Figure 4 It is a three-dimensional schematic diagram of the bidirectional evacuation plate of the present invention; Figure 5 This is a schematic diagram of the cross-sectional reinforcement of the bidirectional evacuated plate of the present invention; Figure 6 for Figure 5 Cross-sectional view along AA direction; Figure 7 The present invention is a two-way evacuation plate edge Figure 6 Cross-sectional views along the BB direction (A) and CC direction (B); Figure 8 A is a three-dimensional schematic diagram of the open narrowing stirrup of the present invention; Figure 8 B is a physical picture of the open narrowing stirrup of the present invention; Figure 9 This is the hysteresis curve of the seismic performance test of the bidirectional evacuated slab composite shear wall connected with the opening narrowing stirrups of the present invention; Figure 10 A three-dimensional schematic diagram of a bidirectional evacuated slab composite shear wall with an L-shaped wall connected by opening narrowed stirrups according to the present invention; Figure 11 for Figure 10 A partial enlarged view of the bottom.

[0042] In the figure: 1 is a two-way hollow plate, 11-1 is a first concrete plate, 11-2 is a second concrete plate, 12 is a concrete rib, 13 is a tie bar, 14 is a horizontal steel bar, 15 is a second vertical hole, 16 is a first vertical hole, 2 is post-cast concrete, 3 is an open narrowing stirrup, 31 is a longitudinal section, 32 is a horizontal section, 33 is a bent section, 34 is a straight section after bending, 4 is an edge member longitudinal reinforcement, 41 is an inner edge member longitudinal reinforcement, 42 is a middle edge member longitudinal reinforcement, 43 is an outer edge member longitudinal reinforcement, 5 is a first horizontal tie bar, 51 is a second horizontal tie bar, and 6 is a rectangular closed stirrup. DETAILED DESCRIPTION

[0043] To make the objectives, technical solutions, and advantages of the embodiments of the present invention more clear, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts shall fall within the scope of protection of the present invention.

[0044] In the present invention, the direction in which the longitudinal reinforcement 4 of the edge member extends is the vertical direction, and the direction in which the horizontal reinforcement 14 extends is the horizontal direction.

[0045] In this solution, the out-of-plane direction refers to the vertical direction of the first concrete slab 11 - 1 and the second concrete slab 11 - 2 .

[0046] Structural Example 1 The present invention provides a construction method for a bidirectional hollow plate composite shear wall connected by opening narrowing stirrups. The bidirectional hollow plate composite shear wall connected by opening narrowing stirrups obtained after construction is as follows: Figure 1-7 As shown, the bidirectional evacuated plate composite shear wall includes a bidirectional evacuated plate 1 and post-cast concrete 2 inside and at both ends thereof, and edge components are provided at both ends of the bidirectional evacuated plate 1 and the ends of the post-cast concrete 2.

[0047] The bidirectional evacuation plate 1 includes a first concrete plate 11 - 1 and a second concrete plate 11 - 2 that are arranged opposite to each other.

[0048] The transverse length of the first concrete slab 11 - 1 is slightly greater than that of the second concrete slab 11 - 2 . After installation, the first concrete slab 11 - 1 and the second concrete slab 11 - 2 are symmetrically arranged on the outside of the wall.

[0049] The bidirectional evacuated slab composite shear wall is provided with various types of steel bars, which together with the bidirectional evacuated slab 1 and the post-cast concrete 2 constitute the bidirectional evacuated slab composite shear wall.

[0050] The edge member includes edge member longitudinal reinforcement 4 embedded in the post-cast concrete 2 and open narrowing stirrups 3 arranged in the horizontal direction. The open narrowing stirrups 3 are distributed in multiples in the vertical direction, and the open narrowing stirrups 3 are symmetrically arranged inside the post-cast concrete 2 at both ends of the bidirectional evacuated plate composite shear wall.

[0051] One end of the open narrowing stirrup 3 is closed and provided with two opposite corners, and the other end is open. The open end is provided with an outward bending section 33 and a straight section 34 after bending. The inner edge member longitudinal reinforcement 41 and the outer edge member longitudinal reinforcement 43 are respectively limited to the inside of the bending section 33, the straight section 34 after bending and the two corners of the closed end of the open narrowing stirrup 3; preferably, two middle edge member longitudinal reinforcements 42 connected by a first horizontal tension reinforcement 5 are further provided between the open end and the closed end, and the outer edge member longitudinal reinforcement 43 and the middle edge member longitudinal reinforcement 42 are tied and fixed at the contact point with the open narrowing stirrup 3.

[0052] like Figure 8 As shown, the opening narrowing stirrup 3 is made of a steel bar through continuous bending processing, including a longitudinal section 31 and horizontal sections 32 connected to the longitudinal section 31 at both ends, and gradually narrows inward from the closed end to the open end; the other end of the horizontal section 32 is bent outward to form a bent section 33 and a straight section 34 after bending, forming an opening narrowing stirrup structure.

[0053] The edge member longitudinal reinforcement 4 includes an inner edge member longitudinal reinforcement 41, a middle edge member longitudinal reinforcement 42 and an outer edge member longitudinal reinforcement 43; the inner edge member longitudinal reinforcement 41 is arranged in the area surrounded by the bent section 33, the straight section 34 after bending and the horizontal section 32 of the opening narrowing stirrup 3, the outer edge member longitudinal reinforcement 43 is arranged at the angle between its horizontal section 32 and the longitudinal section 31, and the middle edge member longitudinal reinforcement 42 is arranged on the inner side of the horizontal section 32 and abuts against the horizontal section 32. The contact points between the outer edge member longitudinal reinforcement 43, the middle edge member longitudinal reinforcement 42 and the opening narrowing stirrup 3 are fixed by binding with metal wire, and the inner edge member longitudinal reinforcement 41 is tightened and fixed by the bent hook of the opening narrowing stirrup.

[0054] The longitudinal bars 42 of the middle edge members are connected by the first horizontal reinforcement bars 5 , and the longitudinal bars 42 of the middle edge members are in contact with the horizontal sections 32 of the opening narrowing stirrups 3 and are fixed by binding with metal wires.

[0055] There are two longitudinal reinforcements 42 of the middle edge member on each side of the bidirectional evacuated plate 1, and a first horizontal reinforcement 5 is set corresponding to the longitudinal reinforcement 42 of the middle edge member. The first horizontal reinforcement 5 corresponds one-to-one to the opening narrowing stirrup 3, and the longitudinal reinforcement 42 of the middle edge member is tied and fixed to the first horizontal reinforcement 5 on the inner side of the opening narrowing stirrup 3.

[0056] A plurality of groups of concrete ribs 12 are arranged in the horizontal and vertical directions between the two opposite first concrete slabs 11-1 and the second concrete slabs 11-2 of the bidirectional evacuation plate 1. Preferably, the concrete ribs 12 are arranged at fixed intervals in the horizontal and vertical directions. Vertical holes are formed between the concrete ribs 12 in the horizontal direction, and horizontal holes are formed between the concrete ribs 12 in the vertical direction. One end of the bent section 33 of the opening narrowing stirrup 3 extends into the horizontal hole at the end of the bidirectional evacuation plate 1. The inner edge member longitudinal reinforcement 41 is arranged in the first vertical holes 16 at the transverse ends of the bidirectional evacuation plate 1. One side of the longitudinal section 31 of the opening narrowing stirrup 3, the middle edge member longitudinal reinforcement 42 and the outer edge member longitudinal reinforcement 43 are all arranged on the outside of the two ends of the bidirectional evacuation plate 1.

[0057] The first horizontal reinforcement 5 at the edge member is used in conjunction with the open narrowing stirrup 3 to improve the restraint capacity of the shear wall edge member steel bars and core area concrete, and improve the problem that the longitudinal reinforcement 4 of the edge member is detached under the action of a larger earthquake and it is difficult to exert its tensile strength.

[0058] As a further preference, the number of the horizontal holes is ≥7, and among the 2-3 horizontal holes from top to bottom and the 2-3 horizontal holes from bottom to top, two groups of open narrowing stirrups 3 are respectively arranged on each of the two lateral sides of each horizontal hole, and one group of open narrowing stirrups 3 is respectively arranged on each of the two lateral sides of the remaining horizontal holes.

[0059] Since the upper and lower ends of the wall are subjected to greater forces when shear failure occurs in the actual structure, the present invention sets stirrup reinforcement densification areas at the upper and lower ends of the bidirectional evacuation plate 1, and sets multiple groups of corresponding open narrowing stirrups 3 at the horizontal holes at the top and bottom to improve the bearing capacity of the wall.

[0060] As a further preference, the number of the vertical holes is ≥3, including the outermost first vertical holes 16 at the two ends and at least one second vertical hole 15 between the two first vertical holes 16, the inner edge member longitudinal reinforcement 41 is arranged in the vertical direction in the first vertical hole 16, and two wall-distributed longitudinal reinforcements are arranged opposite to each other in the vertical direction in each second vertical hole 15, the second horizontal tension reinforcement 51 connects the two opposite wall-distributed longitudinal reinforcements on the inner side of the second vertical hole 15, and the contact between the wall-distributed longitudinal reinforcement on the inner side of the second vertical hole 15 and the second horizontal tension reinforcement 51 is fixed with metal wire.

[0061] In this embodiment, a total of five vertical holes are provided, namely, the outermost first vertical holes 16 at the two ends and three second vertical holes 15 between the two first vertical holes 16 .

[0062] The top ends of the edge member longitudinal reinforcement 4 and the wall distributed longitudinal reinforcement arranged in the second vertical hole 15 pass through the top surface of the two-way evacuated plate 1.

[0063] Through the interaction between the concrete ribs 12 and the surrounding post-cast concrete 2, one end of the bent section 33 of the open narrowing stirrup 3 extends into the horizontal hole of the two-way hollow plate 1 and is connected to the internal wall body to ensure the integrity of the edge member and the internal wall body, and cooperate to resist the earthquake action under small lateral displacement.

[0064] As the opening-narrowing stirrups 3 gradually narrow toward the open end, their restraining effect on the core concrete gradually decreases. This effect is manifested under large horizontal lateral displacements, causing the maximum stress position of the structure to gradually shift toward the open end of the opening-narrowing stirrups 3. This results in the formation of a vertical energy dissipation zone between the middle and open ends of the opening-narrowing stirrups, which in turn causes slight slippage at the joints. This prevents significant shear failure in the structure and effectively regulates the failure mode and energy dissipation of the composite shear wall.

[0065] After the installation of the various steel bars of the edge components is completed, the post-cast concrete is formed by one-time integral casting.

[0066] Tie bars 13 are embedded in the concrete ribs 12 , and horizontal steel bars 14 are correspondingly provided in the first concrete slab 11 - 1 and the second concrete slab 11 - 2 . The tie bars 13 are integrally connected to the horizontal steel bars 14 .

[0067] The tensioning bars 13 are embedded in the concrete ribs 12 and connected to the horizontal steel bars 14 in the first concrete slab 11-1 and the second concrete slab 11-2. The horizontal steel bars 14 are embedded in the first concrete slab 11-1 and the second concrete slab 11-2. Their function is to connect the tensioning bars 13 in the concrete ribs 12 to the horizontal steel bars 14 in the first concrete slab 11-1 and the second concrete slab 11-2, so that the steel bars in the bidirectional evacuated slab 1 are woven into one and bear the force together.

[0068] Steel mesh is provided inside the first concrete slab 11 - 1 and the second concrete slab 11 - 2 , and the steel mesh is buried inside the first concrete slab 11 - 1 and the second concrete slab 11 - 2 .

[0069] The function of the steel wire mesh is to enhance the crack resistance of the bidirectional evacuation plate 1 , thereby preventing cracks from occurring during transportation and affecting the normal use of the bidirectional evacuation plate 1 .

[0070] The bidirectional evacuation plate 1 is prefabricated and is made by integrally pouring concrete and by bidirectional core pulling.

[0071] One end of the horizontal section 32 of the open narrowing stirrup 3 is connected to the longitudinal section 31 and forms an angle of about 70° to 80° with the longitudinal section 31. The other end of the horizontal section 32 is bent outward to form a bent section 33 and a straight section 34 after bending. The length of the straight section 34 after bending is the larger value of 10 times the diameter of the open narrowing stirrup 3 and 75 mm.

[0072] The diameters of each section of the opening narrowing stirrup 3 remain consistent and gradually narrow toward the opening end.

[0073] The angle and the length of the straight section 34 after bending are set within the above range. The purpose is to standardize the production of the open narrowing stirrups 3, and to achieve effective regulation of the restraining effect of the open narrowing stirrups 3 on the core area concrete through the angle; and the length of the straight section 34 after bending the open narrowing stirrups 3 is required to provide sufficient anchorage length and avoid material waste.

[0074] The hysteresis curve of the seismic performance of the "I-shaped" section of the bidirectional evacuated plate composite shear wall connected by the opening narrowing stirrups described in the present invention is as follows: Figure 9 shown.

[0075] The construction method of the bidirectional evacuated slab composite shear wall connected by the opening narrowing stirrups is as follows: First, the distributed longitudinal reinforcement in the wall and the edge member longitudinal reinforcement 4 are set, and then the two-way evacuated plate 1 is hoisted to the distributed longitudinal reinforcement in the wall and the edge member longitudinal reinforcement 4. During the process, the position of the vertical hole is kept corresponding to the corresponding distributed longitudinal reinforcement in the wall or the inner edge member longitudinal reinforcement 41. During the hoisting process, the opening narrowing stirrups 3 are symmetrically set in the edge members on both sides of the end of the two-way evacuated plate composite shear wall. When the two-way evacuated plate 1 is hoisted, the opening narrowing stirrups 3 are inserted into the horizontal holes at the end of the two-way evacuated plate 1. The inner edge member longitudinal reinforcement 41 is limited to the area between the bending section 33, the straight section 34 after bending and the horizontal section 32 of the opening narrowing stirrup 3. The middle edge member longitudinal reinforcement 42 is located at On the inner side of the horizontal section 32 of the opening narrowing stirrup 3 and in contact with the horizontal section 32, the outer edge member longitudinal reinforcement 43 is set at the angle between the horizontal section 32 and the longitudinal section 31 of the opening narrowing stirrup 3, and the first horizontal tension reinforcement 5 is tied between the two middle edge member longitudinal reinforcements 42 corresponding to the opening narrowing stirrup 3. After the two-way hollowing plate 1 is hoisted, the opening narrowing stirrup 3 is tied and fixed with metal wire at the contact between the opening narrowing stirrup 3 and the outer edge member longitudinal reinforcement 43 and the middle edge member longitudinal reinforcement 42, and the inner edge member longitudinal reinforcement 41 is tightened and fixed by the hook of the opening narrowing stirrup 3; finally, concrete is poured at the end edge member and the cavity of the two-way hollowing plate 1.

[0076] Structural Example 2 The open narrowing stirrup 3 of the present invention is not only applicable to the plane structural system of the I-shaped rectangular cross-section shear wall, but also applicable to the L-shaped corner wall with a spatial force effect.

[0077] like Figure 10 and Figure 11 As shown, the open narrowing stirrups 3 can be used in conjunction with the rectangular closed stirrups 6. In the main direction, the method of using the open narrowing stirrups 3 is consistent with the planar structural system of the I-shaped rectangular section shear wall described in Structural Example 1. Rectangular closed stirrups 6 are used in the out-of-plane direction, and additional longitudinal reinforcements and rectangular closed stirrups 6 are provided in the out-of-plane direction of the edge member longitudinal reinforcement 4. The outer edge member longitudinal reinforcement 43 and the middle edge member longitudinal reinforcement 42 are limited at the two corners of the rectangular closed stirrups 6, and the remaining two corners of the rectangular closed stirrups 6 are limited by the additional longitudinal reinforcements. The length of the rectangular closed stirrups 6 is greater than the span of the open narrowing stirrups 3 along the out-of-plane direction.

[0078] The outer edge member longitudinal reinforcement 43 and the middle edge member longitudinal reinforcement 42 on one side of the bidirectional evacuated plate 1 are limited at the two corners of the rectangular closed stirrup 6, and additional longitudinal reinforcements are provided to limit the remaining two corners of the rectangular closed stirrup 6.

[0079] The coordinated use of the open narrowing stirrups 3, the traditional rectangular closed stirrups 6 and the edge member longitudinal reinforcements 4 can ensure the bearing capacity and ductility of the shear wall.

[0080] Method Example 1 The specific steps of the construction process of the bidirectional evacuated plate composite shear wall connected by the opening narrowing stirrups described in Structural Example 1 are as follows.

[0081] 1) Using a bidirectional evacuated plate 1 as the side form of the shear wall, the bidirectional evacuated plate 1 is provided with concrete ribs 12, and horizontal holes and vertical holes are formed between the concrete ribs 12; The bidirectional evacuated plate 1 is provided with preset horizontal steel bars 14 and tension bars 13 to resist shear failure, while meeting the requirements of transportation and hoisting. The bidirectional evacuated plate 1 can serve as a formwork to reduce the amount of formwork used, especially the use of traditional wooden formwork.

[0082] 2) In the second vertical hole 15 of the two-way evacuated plate 1, the inner wall distributed longitudinal reinforcement is set, the inner edge member longitudinal reinforcement 41 is set in the first vertical holes 16 at both ends, and the middle edge member longitudinal reinforcement 42 and the outer edge member longitudinal reinforcement 43 are set on the outside of the two ends. The two opposite middle edge member longitudinal reinforcements 42 are connected and tied together by the first horizontal reinforcement 5. Then, the open narrowing stirrups 3 are set at the corresponding transverse ends. The open narrowing stirrups 3 have one end open and the other end closed, and the open end is wrapped The bent section 33 and the straight section 34 after bending are enclosed, and the inner edge member longitudinal reinforcement 41 is limited between the bent section 33 and the straight section 34 after bending. The middle edge member longitudinal reinforcement 42 and the outer edge member longitudinal reinforcement 43 are respectively arranged at the middle of the horizontal section 32 of the opening narrowing stirrup 3 and the two corners of the closed end, and the outer edge member longitudinal reinforcement 43, the middle edge member longitudinal reinforcement 42 are tied and fixed at the contact point with the opening narrowing stirrup 3, and the inner edge member longitudinal reinforcement 41 is tightened and fixed by the bent hook of the opening narrowing stirrup 3.

[0083] By arranging the wall distributed longitudinal reinforcement and the edge member longitudinal reinforcement 4 at the vertical holes and edge members of the bidirectional evacuation plate 1, it helps to resist bending failure. The open ends of the open narrowing stirrups 3 arranged at both ends extend into the first vertical hole 16 of the bidirectional evacuation plate 1, and are connected to the inner side edge member longitudinal reinforcement 41 of the first vertical hole 16 through their bent sections 33 and the straight sections after bending 34, thereby realizing an effective connection between the edge member and the bidirectional evacuation plate 1.

[0084] 3) Concrete is poured inside and at both ends of the bidirectional evacuated slab 1 to obtain a bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups 3; The edge members and the bidirectional evacuated plate 1 can be synergistically stressed by the connection of the open narrowing stirrups 3. The bidirectional evacuated plate 1 and the post-cast concrete 2 work synergistically under the interaction between the concrete ribs 12 and the surrounding concrete. As the open narrowing stirrups 3 gradually narrow toward the open end, the restraining effect of the open narrowing stirrups 3 on the core area concrete gradually decreases. This effect is reflected under large horizontal lateral displacement, and the maximum stress position of the structure gradually shifts toward the open end of the open narrowing stirrups 3, resulting in the formation of a vertical energy dissipation zone between the middle of the open narrowing stirrups 3 and the open end, which in turn generates a small slip at the joint. This avoids major shear failure of the structure and achieves effective regulation of the failure mode and energy dissipation method of the composite shear wall.

[0085] Method Example 2 The construction method of the bidirectional evacuated plate composite shear wall connected by the open narrowing stirrups described in Structural Example 2 is the same as that of Method Example 1 as a whole, with the only difference being that longitudinal reinforcements and rectangular closed stirrups 6 are additionally provided in the outward direction of the edge member longitudinal reinforcement 4, and the outer edge member longitudinal reinforcement 43 and the middle edge member longitudinal reinforcement 42 on one side of the bidirectional evacuated plate 1 are limited at the two corners of the rectangular closed stirrup 6, and the remaining two corners of the rectangular closed stirrup 6 are limited by the additional longitudinal reinforcements.

[0086] Test Example 1 The seismic performance test of the bidirectional evacuated plate composite shear wall connected by the opening narrowing stirrups of the structural embodiment 1 was carried out. The test method was based on the industry standard of the People's Republic of China "Code for Seismic Test of Buildings" JGJ / T 101-2015. The test results are as follows: Figure 9 shown.

[0087] from Figure 9 It can be seen that the hysteresis curve obtained from the test is relatively full, with obvious elastic stage, yield stage and failure stage, and each characteristic point conforms to the provisions of the current "Concrete Structure Design Standard" GB / T 50010.

[0088] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any equivalent replacement, modification, etc. made by technicians in this field without any creative work within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A construction method for a bidirectional evacuated plate composite shear wall connected by opening narrowing stirrups, characterized in that: The specific steps are as follows: 1) Using a bidirectional evacuation plate (1) as a side form of a shear wall, wherein the bidirectional evacuation plate (1) is provided with concrete ribs (12), and horizontal holes and vertical holes are formed between the concrete ribs (12); 2) In the second vertical hole (15) of the bidirectional evacuated plate (1), an inner wall distributed longitudinal reinforcement is arranged in the first vertical holes (16) at both ends, and an inner edge member longitudinal reinforcement (41) is arranged on the outer sides of the two ends. The two opposite middle edge member longitudinal reinforcements (42) are connected and tied together by a first horizontal tie bar (5). Subsequently, an open narrowing stirrup (3) is arranged at both ends thereof. The open narrowing stirrup (3) has an open end and a closed end. The open end includes a bent section (33) and a straight section (34) after bending. The inner edge member longitudinal reinforcement (41) is limited between the bent section (33) and the straight section (34) after bending. 3) Pour concrete inside and at both ends of the two-way evacuated plate (1).

2. The construction method of a bidirectional evacuated slab composite shear wall connected by narrowed opening stirrups according to claim 1, characterized in that: One end of the opening narrowing stirrup (3) is closed and provided with two opposite corners, and the other end is open, and the opening end is provided with an outward bending section (33) and a straight section (34) after bending. The inner edge member longitudinal reinforcement (41) and the outer edge member longitudinal reinforcement (43) are respectively limited to the bending section (33) and the straight section (34) after bending of the opening narrowing stirrup (3) and the two corners of the closed end. Two middle edge member longitudinal reinforcements (42) connected by a first horizontal tie bar (5) are further provided between the open end and the closed end. The outer edge member longitudinal reinforcement (43) and the middle edge member longitudinal reinforcement (42) are tied and fixed at the contact point with the opening narrowing stirrup (3).

3. The construction method of a bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups according to claim 2, characterized in that: The open narrowing stirrup (3) comprises a longitudinal section (31) and horizontal sections (32) connected to the longitudinal section (31) at both ends thereof, and gradually narrows inward from the closed end to the open end; the other end of the horizontal section (32) is bent outward to form a bent section (33) and a straight section (34) after bending; one end of the horizontal section (32) of the open narrowing stirrup (3) is connected to the longitudinal section (31) and forms an angle of 70-80° with the longitudinal section (31); the other end of the horizontal section (32) is bent outward to form a bent section (33) and a straight section (34) after bending; the length of the straight section (34) after bending is the larger value of 10 times the diameter of the open narrowing stirrup (3) and 75 mm, and the diameters of each section of the open narrowing stirrup (3) are consistent.

4. The construction method of a bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups according to claim 2, characterized in that: The edge member longitudinal reinforcement (4) comprises an inner edge member longitudinal reinforcement (41), a middle edge member longitudinal reinforcement (42) and an outer edge member longitudinal reinforcement (43); the inner edge member longitudinal reinforcement (41) is arranged in an area surrounded by the bent section (33), the straight section (34) after bending and the horizontal section (32) of the opening narrowing stirrup (3); the outer edge member longitudinal reinforcement (43) is arranged at the angle between its horizontal section (32) and the longitudinal section (31); the middle edge member longitudinal reinforcement (42) is arranged inside the horizontal section (32) and abuts against the horizontal section (32); a first horizontal tension reinforcement (5) is tied between the two middle edge member longitudinal reinforcements (42) and corresponding to the opening narrowing stirrup (3); and is tied and fixed at the contact point between the opening narrowing stirrup (3) and the outer edge member longitudinal reinforcement (43) and the middle edge member longitudinal reinforcement (42); and the inner edge member longitudinal reinforcement (41) is tightened and fixed by the bent hook of the opening narrowing stirrup.

5. The method for constructing a bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups according to any one of claims 1 to 4, characterized in that: The bidirectional evacuated plate composite shear wall comprises a bidirectional evacuated plate (1) and post-cast concrete (2) inside and at both ends thereof; edge members are provided on both sides of the bidirectional evacuated plate (1) and at the ends of the post-cast concrete (2); the bidirectional evacuated plate (1) comprises a first concrete plate (11-1) and a second concrete plate (11-2) arranged opposite to each other; the edge members comprise edge member longitudinal reinforcement (4) embedded in the post-cast concrete (2) and open narrowing stirrups (3) arranged in the horizontal direction; a plurality of the open narrowing stirrups (3) are distributed in the vertical direction; and the open narrowing stirrups (3) are symmetrically arranged inside the post-cast concrete (2) at both ends of the bidirectional evacuated plate composite shear wall.

6. The method for constructing a bidirectional evacuated slab composite shear wall connected by opening narrowed stirrups according to any one of claims 1 to 4, characterized in that: The number of the middle edge member longitudinal reinforcements (42) on each side of the two-way evacuated plate (1) is two, and a first horizontal reinforcement (5) is provided corresponding to the middle edge member longitudinal reinforcement (42). The first horizontal reinforcement (5) corresponds one-to-one to the opening narrowing stirrups (3), and the middle edge member longitudinal reinforcement (42) is tied and fixed to the first horizontal reinforcement (5) on the inner side of the opening narrowing stirrups (3).

7. The construction method of a bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups according to claim 5, characterized in that: A plurality of groups of concrete ribs (12) are arranged between the two opposite first concrete slabs (11-1) and the second concrete slabs (11-2) of the bidirectional evacuation plate (1) along the horizontal and vertical directions. Vertical holes are formed between the horizontal concrete ribs (12), and horizontal holes are formed between the vertical concrete ribs (12). One end of the bent section (33) of the opening narrowing stirrup (3) extends into the horizontal hole at the end of the bidirectional evacuation plate (1). The inner edge member longitudinal reinforcement (41) is arranged in the first vertical holes (16) at the transverse ends of the bidirectional evacuation plate (1). One side of the longitudinal section (31) of the opening narrowing stirrup (3), the middle edge member longitudinal reinforcement (42) and the outer edge member longitudinal reinforcement (43) are all arranged outside the two ends of the bidirectional evacuation plate (1).

8. The construction method of a bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups according to claim 7, characterized in that: The number of the horizontal holes is ≥ 7, and among the 2-3 horizontal holes from top to bottom and the 2-3 horizontal holes from bottom to top at the bottom, two sets of open narrowing stirrups (3) are respectively provided on both sides of each horizontal hole, and one set of open narrowing stirrups (3) is respectively provided on both sides of the remaining horizontal holes; The number of the vertical holes is ≥3, including the outermost first vertical holes (16) at the two ends and at least one second vertical hole (15) between the two first vertical holes (16), an inner edge member longitudinal reinforcement (41) is arranged in the vertical direction in the first vertical hole (16), two wall-distributed longitudinal reinforcements are arranged opposite to each other in the vertical direction in each second vertical hole (15), a second horizontal tie bar (51) connects the two opposite wall-distributed longitudinal reinforcements inside the second vertical hole (15), and the wall-distributed longitudinal reinforcement inside the second vertical hole (15) is tied and fixed at the contact point with the second horizontal tie bar (51); Tension bars (13) are embedded in the concrete ribs (12); horizontal reinforcement bars (14) are correspondingly disposed in the first concrete slab (11-1) and the second concrete slab (11-2); the tension bars (13) and the horizontal reinforcement bars (14) are integrally connected; and the horizontal reinforcement bars (14) are embedded in the first concrete slab (11-1) and the second concrete slab (11-2).

9. The construction method of a bidirectional evacuated slab composite shear wall connected by opening narrowing stirrups according to claim 5, characterized in that: Steel mesh is provided inside the first concrete slab (11-1) and the second concrete slab (11-2), and the steel mesh is buried inside the first concrete slab (11-1) and the second concrete slab (11-2).

10. The method for constructing a bidirectional evacuated slab composite shear wall connected by open narrowing stirrups according to any one of claims 1 to 4, characterized in that: Longitudinal reinforcement and rectangular closed stirrups (6) are additionally provided in the outward direction of the edge member longitudinal reinforcement (4); the outer edge member longitudinal reinforcement (43) and the middle edge member longitudinal reinforcement (42) are limited at two corners of the rectangular closed stirrups (6); and the remaining two corners of the rectangular closed stirrups (6) are limited by the additional longitudinal reinforcement.

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