Low-prestressed green fabricated self-resetting wall

Abstract

The present invention relates to a low-prestressed green fabricated self-resetting wall, comprising a hinged wall, a hinged column, a horizontal force transmission key of a steel sliding groove, a self-reset anti-shearing device with a low-prestress requirement, and a concrete base, wherein the hinged wall and the hinged column are fixed to the concrete base, and the self-reset anti-shearing device with the low-prestress requirement and the horizontal force transmission key of the steel sliding groove are arranged in a staggered manner to connect to the bottom hinged wall and the hinged column. The self-reset anti-shearing device with the low-prestress requirement is arranged between different floors, and the horizontal force transmission key of the steel sliding groove is arranged at floor height. Under an earthquake load, the hinged wall and the hinged column rotate around respective explicit hinged supports under the action of a lateral force. In this case, the horizontal force transmission key of the steel sliding groove only controls the coordinated rotations of the bottom hinged wall and the hinged column, and the self-reset anti-shearing device with the low-prestress requirement not only controls the coordinated rotations of the bottom hinged wall and the bottom hinged column, but also dissipates inputted energy and realizes self-resetting of a structure.

Description

A low prestressed green assembled self-resetting wall Technical Field

[0001] The present invention is used for the seismic design of new buildings and the seismic reinforcement of existing buildings. Background Art

[0002] Green prefabricated self-righting walls are a new type of high-performance structural technology with the important attributes of "green environmental protection" and "seismic resilience", and are closely related to my country's major strategic needs. Existing self-righting walls can be divided into 1) bottom-seam prefabricated self-righting walls that use a flexible rocking mechanism at the bottom to facilitate component prefabrication, assembly, and reduce wall damage; and 2) bottom-seam prefabricated self-righting walls that use self-resetting and energy-absorbing devices to resist lateral movement and control residual displacement. Green prefabricated self-righting walls can be divided into bottom-seam prefabricated self-righting walls and bottom-hinged prefabricated self-righting walls. Both types of prefabricated self-righting walls can achieve rigid-body-like rotation under horizontal forces, have a clear assembly concept, and significantly reduce wall damage compared to ordinary shear walls.

[0003] However, existing green prefabricated self-resetting walls face key bottlenecks in terms of green full assembly, reset mechanism, and swing mechanism, which significantly reduce their green environmental protection and seismic resilience. In terms of green full assembly, the assembly process of the bottom-seam prefabricated self-resetting wall still requires on-site processes such as post-tensioning prestressed tendon anchor end grouting wet connection and actuator prestressing. The bottom-hinged prefabricated self-resetting wall requires replacement of the entire self-resetting and energy-dissipating devices after an earthquake. In terms of reset mechanism, both types of green prefabricated self-resetting walls rely on high-level prestressed reset, which increases the difficulty of component assembly and reduces the wall's deformation capacity. Long-term problems are difficult to resolve, easily causing local damage and reducing the wall's seismic reliability. The bottom-hinged swing mechanism is severely affected by the second-order effect of gravity, resulting in weak anti-collapse ability. Once a device is damaged, the lateral resistance will rapidly decrease.

[0004] Summary of the Invention

[0005] To address the above-mentioned shortcomings of existing prefabricated self-resetting walls, the present invention proposes a low-prestress, green prefabricated self-resetting wall. This solves the problem of self-resetting walls requiring high levels of prestress, avoids the disadvantage of prefabricated self-resetting walls experiencing localized damage due to lifting and collision at corners under earthquake loads, which reduces the wall's subsequent seismic redundancy. Furthermore, damaged energy-consuming components are easily replaced, allowing for rapid post-earthquake restoration. This prefabricated structure can be industrially produced in a factory and quickly installed at the construction site, resulting in a low cost and energy-saving and environmentally friendly solution.

[0006] In order to achieve the above objectives, the present invention provides the following technical solutions:

[0007] A low prestressed green assembled self-resetting wall is characterized by comprising a hinged wall (1), a hinged support (2), a steel chute horizontal force transmission key (3), a low prestressed demand self-resetting shearing device (4), and a concrete base (5), wherein:

[0008] Hinge pillars (2) are arranged on both sides of the hinged wall (1), and steel slideway horizontal force transmission keys (3) and low prestressed demand self-resetting shearing devices (4) are arranged alternately between the hinged wall (1) and the hinged pillars (2);

[0009] The hinged wall (1) and the hinged support (2) are hingedly connected to the concrete base (5) at the bottom;

[0010] Under earthquake load, the action of lateral force allows the hinged wall (1) and the hinged column (2) to rotate at the same angle through the steel chute horizontal force transmission key (3) and the low prestress demand self-resetting shear device (4); the steel chute horizontal force transmission key (3) and the low prestress demand self-resetting shear device (4) jointly control the rotation coordination of the hinged wall (1) and the hinged column (2), and the low prestress demand self-resetting shear device (4) dissipates the energy input to the structure and reduces the residual displacement of the structure after the earthquake through the self-resetting of the device.

[0011] The present invention provides a low-prestressed green prefabricated self-resetting wall. The wall consists of a hinged wall, a hinged column, a steel chute horizontal force transmission key, a low-prestressed demand self-resetting shearing device and a concrete base. The hinged wall and the hinged column are fixed on the concrete base, and the low-prestressed demand self-resetting shearing device and the steel chute horizontal force transmission key are staggered to connect the bottom hinged wall and the hinged column. Under seismic loads, the lateral force causes the hinged wall and the hinged column to rotate around their respective manifested hinge supports. At this time, the steel chute horizontal force transmission key only controls the rotation coordination of the bottom hinged wall and the hinged column, and the low-prestressed demand self-resetting shearing device not only controls the rotation coordination of the bottom hinged wall and the hinged column, but also dissipates the energy of the input component and realizes the self-resetting of the structure. The present invention offers low construction difficulty and does not require the post-tensioning of the entire wall with a large amount of prestress to achieve self-reset. This avoids the loss of prestress caused by the prolonged application of high levels of prestress to prefabricated self-reset walls, which can lead to unstable seismic performance. It also avoids the problem of prefabricated self-reset walls lifting and colliding under seismic loads, and the resulting local damage, which can reduce subsequent seismic redundancy. The present invention can effectively control the inter-story displacement angles of each floor of the structure to be the same under seismic loads, avoiding a significant decrease in the overall seismic performance of the structure due to excessive lateral displacement of a single floor. It can also effectively reduce the residual displacement response of the structure after an earthquake, shortening the time it takes to repair the structure after an earthquake. BRIEF DESCRIPTION OF THE DRAWINGS

[0012] FIG1 is the overall structure of the low prestressed green prefabricated self-resetting wall of the present invention and its deformation mode under earthquake load;

[0013] FIG2 is a structural diagram of a hinged wall;

[0014] FIG3 is a structural diagram of a hinge support;

[0015] FIG4 is a structural diagram of a horizontal force transmission key of a steel chute;

[0016] FIG5 is an exploded structural diagram of the horizontal force transmission key of the steel chute;

[0017] FIG6 is a structural diagram of a self-resetting shearing device with low prestressing requirement;

[0018] FIG7 is a cross-sectional view of a self-resetting shear device with low prestress requirement.

[0019] FIG8 is a structural diagram of the support and the connecting parts of the transmission mechanism of the low prestress demand self-resetting shear device;

[0020] FIG9 is a cross-sectional view of the bracket and the connecting parts of the transmission mechanism of the low prestress demand self-resetting shear device;

[0021] FIG10 is a structural diagram of the upper end connection component of the low prestress demand self-resetting shear device;

[0022] FIG11 is a cross-sectional view of the upper end connection component of the low prestress demand self-resetting shear device;

[0023] FIG12 is a structural diagram of the left and right end connecting components of the low prestressing demand self-resetting shear device;

[0024] FIG13 is a structural diagram of the lower end connection component of the low prestress demand self-resetting shear device;

[0025] FIG14 is a schematic diagram of the disc spring assembly connected to the disc spring baffle of the low prestress demand self-resetting shear device;

[0026] Figure 15 is a schematic diagram of the energy-dissipating steel rod of the self-resetting shear device with low prestressing demand;

[0027] FIG16 is a schematic diagram showing the structure and state comparison of a self-locking clamp of an embodiment of a self-resetting shearing device with low prestress requirement;

[0028] FIG17 is a schematic diagram of the deconstruction of a low prestress demand self-resetting shear device;

[0029] Figure 18 shows the deformation and energy consumption mechanism of the self-resetting shear device with low prestressing demand.

[0030] Figure numerals: hinged wall (1), wall part (1-1), prestressed tendons (1-2), bottom visible hinge support (1-3); hinged pillar (2), column part (2-1), column foot visible hinge support (2-2); steel slide horizontal force transmission key (3), rod (3-1), left part (3-2), right part (3-3); low prestress demand self-resetting shear device (4), energy-absorbing steel rod (4-1), core energy-absorbing section (4-1-1), connecting section (4-1-2), self-locking clamp (4-2), anchor ring (4-2-1), clip (4-2-2), O-type rubber ring (4-2-3), reset spring (4-2-4), pressure cover assembly (4-2-5), high-strength steel rod (4-3), prestressed screw (4-4), disc spring group (4-5), disc spring baffle (4-6), Upper end connecting component (4-7), top connecting plate (4-7-1), upper cavity (4-7-2), lower cavity (4-7-3), middle plate (4-7-4); left end connecting component (4-8), first cylinder (4-8-1), first wing (4-8-2), first connecting plate (4-8-3); right end connecting component (4-9), second cylinder (4-9-1), second wing (4-9-2), second connecting plate (4-9-3); middle connecting component (4-10); lower end connecting component (4-11), cylindrical rod (4-11-1), bottom connecting plate (4-11-2) concrete base (5). DETAILED DESCRIPTION

[0031] The technical solution of the present invention is further described below with reference to the accompanying drawings.

[0032] As shown in FIG1 , an assembled swing-adaptive bottom hinged self-resetting wall comprises a hinged wall (1), a hinged support column (2), a steel chute horizontal force transmission key (3), a low prestressed stress demand self-resetting shearing device (4) and a concrete base (5). The steel chute horizontal force transmission key (3) and the low prestressed stress demand self-resetting shearing device (4) are arranged alternately between the hinged wall (1) and the hinged support column (2), and the bottoms of the hinged wall (1) and the hinged support column (2) are fixed on the concrete base (5).

[0033] As shown in FIG2 , the hinged wall portion (1) includes a wall portion (1-1), prestressed tendons (1-2), and a bottom manifest hinge support (1-3): the wall portion (1-1) is the main body, the prestressed tendons (1-2) are tensioned inside the wall portion (1-1), the bottom manifest hinge support (1-3) is set on a concrete base (5), the wall portion (1-1) is connected to the bottom manifest hinge support (1-3) through a steel section, the bottom manifest hinge support (1-3) has a small stiffness, and under the action of lateral force, the wall portion (1-1) will rotate around its bottom manifest hinge support (1-3).

[0034] As shown in FIG3 , the hinge pillar (2) includes a column portion (2-1) and a column foot manifest hinge support (2-2): the column portion (2-1) is the main body, the column foot manifest hinge support (2-2) is arranged on a concrete base (5), the column portion (2-1) is connected to the column foot manifest hinge support (2-2), the column foot manifest hinge support (2-2) has a small stiffness, and under the action of lateral force, the column portion (2-2) rotates around its column foot manifest hinge support (2-2).

[0035] Furthermore, the hinged wall (1) and the hinged support (2) have the same height H. Under the action of lateral force, the hinged wall (1) and the hinged support (2) rotate around their respective bottom manifested hinge supports at an angle α. The wall top displacement of the present invention is δ=α·H.

[0036] As shown in Figures 4 and 5, the horizontal force transmission key (3) includes a rod (3-1), a left component (3-2), and a right component (3-3), wherein: the rod (3-1) is realized by a screw and a nut, the left component (3-2) is designed in a T-shape, and the right component (3-3) is designed in a π-shape, the tongue of the T-shaped left component (3-2) is longitudinally provided with a long slot, and the two tongues of the π-shaped right component (3-3) are respectively provided with round holes; the rod (3-1) passes through the first round hole of the right component (3-3), the long slot of the left component (3-2), and the second round hole of the right component (3-3) in sequence through the screw, and is tightened and fixed with a nut at the other end;

[0037] The horizontal force transmission key (3) is fixed between the hinged wall (1) and the hinged support column (2) through its left component (3-2) and right component (3-3);

[0038] In practical applications, the positional relationship between the left component (3-2) and the right component (3-3) can be exchanged;

[0039] Under earthquake load, the lateral force causes the hinged wall (1) and the hinged support (2) to rotate around their respective bottom visible hinged supports, and the left component (3-2) and the right component (3-3) connecting the two are shear dislocated. At this time, the rod (3-1) (3-1) slides freely in the vertical direction in the long groove of the left component (3-2), only transmitting horizontal force, controlling the rotation coordination of the hinged wall (1) and the hinged support (2), and ensuring that the hinged wall (1) and the hinged support (2) have no out-of-plane offset.

[0040] The following is a detailed description of the low prestressing demand self-resetting shear device (4) through Figures 6 to 17:

[0041] The low prestressing demand self-resetting shearing device (4) is composed of a self-resetting prestressing system, an energy dissipation system, and a bracket and a transmission mechanism for installing the self-resetting prestressing system and the energy dissipation system. The three form an integrated body, which is connected to the outside to introduce energy through the bracket and the transmission mechanism; when the hinged wall (1) and the hinged support (2) rotate around their respective manifested hinge supports under earthquake loads, the device undergoes shear deformation (loading), and the energy dissipation system therein undergoes tensile yield deformation. At the same time, the prestressed screw in the self-resetting prestressing system undergoes tensile elastic deformation, and the disc spring group undergoes compressive elastic deformation. The device completes the reset through the restoring force generated by the deformation of the self-resetting prestressing system during the shear deformation (loading) process.

[0042] The bracket and transmission mechanism include an upper connecting component (4-7), a left connecting component (4-8), a right connecting component (4-9), an intermediate connecting component (4-10) and a lower connecting component (4-11): wherein the upper connecting component (4-7), the intermediate connecting component (4-10) and the lower connecting component (4-11) constitute a bracket for installing the self-resetting prestressed system and the energy dissipation system; wherein the two end surfaces of the upper connecting component (4-7) and the lower connecting component (4-11) determine the initial length L before the shear energy dissipation device is separated in the length direction;

[0043] The left end connecting component (4-8) and the right end connecting component (4-9) form a movable nested structure, which is located between the upper end connecting component (4-7) and the middle connecting component (4-10), and is connected to the hinged wall (1) and the bottom hinged column part (2) through the wings, and is used to input the shear dislocation and energy generated when the hinged wall (1) and the bottom hinged column part (2) rotate around their respective manifested hinge supports under the action of lateral force;

[0044] The movable shaft of the movable nesting structure is arranged in the cavity of the upper connecting part (4-7), and the two wings extend from the side wall of the cavity. The upper and lower ends of the movable shaft are in rigid contact with the upper connecting part (4-7) and the lower connecting part (4-11) respectively. After input shear dislocation, the movable nesting structure slides axially relative to each other, thereby pushing the upper connecting part (4-7) and the lower connecting part (4-11) to separate relatively.

[0045] Specifically, the upper end connecting component (4-7) has a main body that is a hollow cylinder, which is divided into two upper and lower open cavities by an intermediate plate (4-7-4), wherein a top connecting plate (4-7-1) is fixed at the top opening of the upper cavity (4-7-2), and the lower cavity (4-7-3) has an open bottom and side walls that are symmetrically grooved along the central axis of the cavity;

[0046] The lower end connecting component (4-11) comprises a cylindrical rod (4-11-1) and a bottom connecting plate (4-11-2) fixed to the bottom of the cylindrical rod (4-11-1);

[0047] An opening is provided in the center of the middle connecting component (4-10) for the lower cavity (4-7-3) of the upper connecting component (4-7) to pass through;

[0048] The movable nested structure includes a left end connecting component (4-8) and a right end connecting component (4-9), and takes the insertion of the right end connecting component (4-9) into the left end connecting component (4-8) as an example;

[0049] The left end connecting component (4-8) comprises a first cylinder (4-8-1) with a slotted side wall, a first wing (4-8-2) and a first connecting plate (4-8-3); the first connecting plate (4-8-3) is connected to the wall (1-1) of the hinged wall (1) or the column (2-1) of the hinged support (2) by bolts; the first wing (4-8-2) is fixed to the outer wall of the first cylinder (4-8-1); and the side wall of the first cylinder (4-8-1) is provided with a slot;

[0050] The right end connecting component (4-9) comprises a second cylinder (4-9-1), a second wing (4-9-2) and a second connecting plate (4-9-3); the second connecting plate (4-9-3) is connected to the wall (1-1) of the hinged wall (1) or the column (2-1) of the hinge support (2) by bolts; and the second wing (4-9-2) is fixed to the outer wall of the second cylinder (4-9-1);

[0051] The first cylinder (4-8-1) and the second cylinder (4-9-1) are at the same height;

[0052] The second cylinder (4-9-1) is placed inside the first cylinder (4-8-1) to form a movable shaft body of a movable nested structure, and the second wing portion (4-9-2) extends from a groove on the side wall of the first cylinder (4-8-1), thereby forming a pair of wings of the movable nested structure together with the first wing portion (4-8-2) on the other side of the movable shaft body;

[0053] Conversely, the positions of the left and right end connecting parts are interchanged, and vice versa.

[0054] In the axial direction, i.e., the length direction, the movable nesting structure is placed in the lower cavity (4-7-3) of the upper connecting part (4-7), and the first wing (4-8-2) and the second wing (4-9-2) extend from the slots on both sides of the lower cavity (4-7-3) for connection to the outside; the top of the movable shaft body of the movable nesting structure is in rigid contact with the middle plate (4-7-4) of the upper connecting part (4-7), and the bottom of the movable shaft body is placed on the top of the cylindrical rod (4-11-1) of the lower connecting part (4-11) and in rigid contact; the movable shaft body and the cylindrical rod (4-11-1) overlapped with each other are inserted together and confined in the lower cavity (4-7-3); under the input of external energy, the movable nesting structure slides against each other in the axial direction to promote the relative displacement of the upper connecting part (4-7) and the lower connecting part (4-11).

[0055] Furthermore, the width W of the first wing (4-8-2) 4-8,2 It must be smaller than the slot width W of the lower cavity (4-7-3) of the upper connecting part (4-7) 4-7 , the width W of the second wing (4-9-2) 4-9 It must also be smaller than the slot width W of the first cylinder (4-8-1) of the left end connecting component (4-8) 4-8,1 The slot width W of the lower cavity (4-7-3) of the upper connecting part (4-7) is 4-7 To ensure that the left end connecting component (4-8) and the right end connecting component (4-9) can shift relative to each other in the lower cavity (4-7-3).

[0056] Furthermore, the height H of the cylindrical rod (4-11-1) 4-11 The height H of the movable shaft 4-8 The sum of the heights H should be slightly greater than the height H of the lower cavity (4-7-3) of the upper connecting part. 4-7 In order to ensure that the cylindrical rod (4-11-1) is always in the lower cavity (4-7-3) of the upper end connecting part (4-7) during operation, the height H of the movable shaft is twice as high as 4-8 Need to be smaller than the height H of the lower cavity (4-7-3) 4-7 , satisfying the following relationship: H 4-11 +H 4-8 ≥H 4-7 >2H 4-8 .

[0057] The energy dissipation system includes two or more energy dissipation steel bars (4-1);

[0058] The upper and lower ends of the energy-absorbing steel rod (4-1) are respectively fixed on the top connecting plate (4-7-1) of the upper end connecting component (4-7) and the middle connecting component (4-10).

[0059] During use, the energy-consuming steel rod (4-1) is a consumable item and can be replaced.

[0060] Specifically, as shown in Figure 15, the energy-absorbing steel rod (4-1) is divided into three sections, the middle section is the core energy-absorbing section (4-1-1), and the upper and lower sections are connecting sections (4-1-2). The core energy-absorbing section (4-1-1) will yield and dissipate energy when subjected to tension, while the connecting section (4-1-2) has a larger diameter to ensure that it will not yield during loading.

[0061] Furthermore, as an embodiment, the connecting section (4-1-2) of the energy-absorbing steel rod (4-1) is engraved with threads, and the upper and lower ends of the energy-absorbing steel rod (4-1) can be fixed to the top connecting plate (4-7-1) of the upper end connecting component and the middle connecting component (4-10) respectively by nuts.

[0062] The self-resetting prestressing system includes a prestressing system and a self-resetting system, which are installed on the bracket and the transmission mechanism:

[0063] As shown in Figures 6 and 14, the prestressed system includes a prestressed screw (4-4), a disc spring baffle (4-6) and a disc spring group (4-5), wherein the disc spring baffle (4-6) is arranged at the top of the disc spring group (4-5); the disc spring group (4-5) is composed of a plurality of disc springs connected in parallel, and the disc spring group (4-5) and the disc spring baffle (4-6) are arranged in the upper cavity (4-7-2) of the upper connecting member; the top connecting plate (4-7-1) of the upper end connecting member (4-7) is connected to the upper end of the disc spring group (4-5). ), the second cylinder (4-9-1) of the right end connecting component (4-9), the cylindrical rod (4-11-1) of the lower end connecting component (4-11) and the bottom connecting plate (4-11-2) of the lower end connecting component (4-11) are all reserved with through holes in the center, the upper end of the prestressed screw (4-4) is fixed to the disc spring baffle (4-6), passes through the disc spring group (4-5) and the through holes of each connecting component in sequence, and then passes through the bottom connecting plate (4-11-2) of the lower end connecting component (4-11);

[0064] Furthermore, as an embodiment, the prestressed screw rod (4-4) can be fixed to the top disc spring baffle (4-6) and the bottom connecting plate (4-11-2) of the lower end connecting component (4-11) by bolts respectively.

[0065] In which, the self-resetting system includes a self-locking clamp (4-2) and a high-strength steel rod (4-3); the self-locking clamp (4-2) is fixed on the middle connecting component (4-11), and the high-strength steel rod (4-3) is arranged between the middle connecting component (4-11) and the lower end connecting component (4-11), as shown in Figure 6; specifically, the upper end of the high-strength steel rod (4-3) is connected to the self-locking clamp (4-2), and the lower end of the high-strength steel rod (4-3) is fixed to the bottom connecting plate (4-11-2) of the lower end connecting component (4-11), together forming a one-way force transmission element.

[0066] Furthermore, as an embodiment, the self-locking clamp (4-2) can be fixed on the middle connecting component (4-11); the high-strength steel rod (4-3) can be fixed to the bottom connecting plate (4-11-2) of the lower connecting component (4-11) through a nut.

[0067] Specifically, as shown in FIG16 , in the embodiment, the self-locking clamp (4-2) in the self-resetting system includes an anchor ring (4-2-1), a clip (4-2-2), an O-type rubber ring (4-2-3), a reset spring (4-2-4) and a gland assembly (4-2-5), wherein:

[0068] The clips (4-2-2) are multiple pieces, built into the anchor ring (4-2-1) and enclosed outside the high-strength steel rod (4-3). A groove is reserved at the end thereof and an O-type rubber ring (4-2-3) is provided, so that the clips can work stably in the gap cavity between the anchor ring (4-2-1) and the high-strength steel rod (4-3).

[0069] The return spring (4-2-4) is arranged on the upper part of the clamp (4-2-2), and the high-strength steel rod (4-3) passes through the return spring (4-2-4);

[0070] The gland assembly (4-2-5) is arranged on the upper part of the anchor ring (4-2-1) and is used to support the return spring (4-2-4) to ensure axial stability during operation;

[0071] The above design enables the self-locking clamp (4-2) to bear the force by engaging the multiple enclosed clamping pieces (4-2-2) with the high-strength steel rod (4-3) when under tension; and when under compression, the clamping pieces (4-2-2) and the high-strength steel rod (4-3) are loosened, and relative sliding occurs between the clamping pieces (4-2-2) and the high-strength steel rod (4-3) without bearing the force.

[0072] In the embodiment, the structure and working principle of the self-locking clamp are shown in Figure 16. In the energy dissipation stage, as shown in Figure 16(a) of the high-strength steel bar anchoring (load-bearing) state, the clamp (4-2-2) will bite the high-strength steel bar (4-3) and bear the force, thereby stretching the energy-dissipating steel bar (4-1) to dissipate energy; in the reset stage, as shown in Figure 16(b) of the high-strength steel bar sliding (non-load-bearing) state:

[0073] The clamp (4-2-2) no longer bites the high-strength steel rod (4-3), the clamp reset spring (4-2-4) is compressed, the high-strength steel rod (4-3) and the clamp (4-2-2) no longer bear force, and the self-locking clamp (4-2) and the middle connecting component (4-10) slide toward the lower end connecting component (4-11), thereby preventing the energy-consuming steel rod (4-1) in a stretched state during the energy-consuming stage from being compressed.

[0074] The control figure 1 shows the working state changes (initial state, loading state, reset state) of the integral shear wall and the horizontal force transmission key (3) of the present invention, and the corresponding control figure 18 shows the working state changes (initial state, loading state, reset state) of the low prestress demand self-resetting shear device (4);

[0075] The details are as follows:

[0076] 1) The overall shear wall is in the initial static state, as shown in Figure 1(a), with no external force input.

[0077] Among them, the initial state of the shear device (4) is as shown in Figure 18(a): the top of the movable shaft of the movable nested structure composed of the left end connecting part (4-8) and the right connecting part (4-9) is close to the middle plate (4-7-4) of the upper end connecting part (4-7); the disc spring group (4-5) is in a slightly compressed state in this initial state due to the need for prestress; the energy-absorbing steel rod (4-1) is stationary on the device; and the self-locking clamp (4-2) bites the high-strength steel rod (4-3).

[0078] At this time, the distance L between the upper connecting component (4-7) and the lower connecting component (4-11) is L1+L2, wherein the distance between the upper connecting component (4-7) and the middle connecting component (4-10) is L1, and the distance between the middle connecting component (4-10) and the lower connecting component (4-11) is L2.

[0079] Among them, the initial static state of the horizontal force transmission key (3) is as shown in Figure 1 (a), with no external force input. At this time, the screw of the rod (3-1) is stable in the middle position of the long sliding groove of the left component (3-2).

[0080] 2) Shear deformation occurs due to external lateral force input loading:

[0081] The state of the overall shear wall is shown in Figure 1(b) (i.e., loaded state), and the hinged wall (1) and the hinged support (2) rotate around their respective bottom hinged supports at an angle of α.

[0082] The state of the shear device (4) is shown in FIG18(b) (i.e., the loaded state):

[0083] The left-end connecting component (4-8) and the right-end connecting component (4-9) of the bracket and the transmission mechanism are mutually displaced due to the rotation of the hinged wall (1) and the hinged support (2), pushing the upper-end connecting component (4-7) and the lower-end connecting component (4-11) to undergo axial relative displacement. At this time, the disc spring group (4-5) in the prestressed system is continuously compressed and stores energy in the upper cavity (4-7-2); at the same time, the high-strength steel rod (4-3) and the self-locking clamp (4-2) in the self-resetting system are engaged (clamped) to exert a self-locking function; at the same time, the energy-dissipating steel rod (4-1) outside the upper cavity (4-7-2) enters the energy-dissipating mechanism, and the energy-dissipating material is stretched and deformed by ΔL, and the energy is absorbed by the tensile yielding.

[0084] The self-locking clamp (4-2) continuously engages the high-strength steel rod (4-3), that is, the high-strength steel rod (4-3) moves along with the lower end connecting component (4-11) (displaced in the direction away from the upper end connecting component (4-7)).

[0085] During this period, the distance between the middle connecting part (4-10) and the lower connecting part (4-11) remains unchanged at L2. At this time, the distance between the upper connecting part (4-7) and the middle connecting part (4-10) increases to L1+ΔL; at the same time, the left part (3-2) and the right part (3-3) of the steel slide horizontal force transmission key (3) are displaced, and the relative displacement of the dislocation is ΔL.

[0086] Among them, the loading state of the horizontal force transmission key (3) is shown in Figure 1(b). Due to the input of external force, the hinged wall (1) and the hinged support (2) rotate and shift relative to each other. At this time, the left component (3-2) and the right component (3-3) shift relative to each other, and the relative displacement of the shift is also ΔL.

[0087] 3) Due to unloading of external lateral force, to the fully reset state:

[0088] The rotation angles of the hinged wall (1) and the hinged support (2) of the integral shear wall around their respective bottom manifested hinged supports decrease, and the state of the integral shear wall after unloading is shown in FIG1(c).

[0089] The state of the shear device (4) is shown in Figure 18(c):

[0090] The displacement of the left-end connecting component (4-8) and the right-end connecting component (4-9) enters a decreasing trend. At this time, the prestressed system composed of the prestressed screw (4-4) and the disc spring group (4-5) in series will undergo a reset action due to compression; along with the reset process of the prestressed system, the high-strength steel rod (4-3) and the self-locking clamp (4-2) in the self-reset system play an unlocking function and can slide relative to each other. The high-strength steel rod (4-3) extends out of the self-locking clamp (4-2). Since friction resistance is avoided during the sliding reset, a small amount of prestress can achieve the reset goal.

[0091] At this time, the left end connecting component (4-8), the right end connecting component (4-9) and the disc spring group (4-5) of the shearing device return to their initial state, and the distance between the upper end connecting component (4-7) and the lower end connecting component (4-11) returns to the initial state distance L. At the same time, the distance between the upper end connecting component (4-7) and the middle connecting component (4-10) remains at L1+ΔL, and the distance between the middle connecting components (4-10) and the lower end connecting component (4-11) is reduced to L2-ΔL.

[0092] Among them, the horizontal force transmission key (3) returns to the initial static state after being fully reset, as shown in Figure 1(c). At this time, the screw of the rod (3-1) is stabilized in the middle position of the long sliding groove of the left component (3-2).

[0093] When in use, the low prestress demand self-resetting shear device has three states: state one (initial state), state two (loaded state), and state three (reset state). Correspondingly, the reset spring of the self-locking clamp is in different degrees of compression: maintaining engagement (force transmission) to maintain and ensure stiffness; and being able to adapt to the transition from state one to state two, that is, the high-strength steel rod moves with the lower end connection component (displacement away from the upper end connection component 1).

[0094] Specifically:

[0095] State 1 (initial state): The return spring is in a compressed state, exerting pressure on the clip; at this time, the clip squeezes the wedge-shaped inner wall of the anchor ring and bites the high-strength steel rod.

[0096] State 2 (loaded state): The return spring is in a compressed state, exerting the same degree of pressure on the clip; the high-strength steel rod tends to move downward, and the friction between the clip and the clip causes the clip to squeeze the wedge-shaped inner wall of the anchor ring more severely than in state 1, causing the clip to continuously bite the high-strength steel rod.

[0097] State three (reset state): the reset spring is still in a compressed state (the degree of compression is slightly increased); the high-strength steel rod tends to move upward. At this time, the friction between the high-strength steel rod and the clip causes the clip to squeeze less or no more on the wedge-shaped inner wall of the anchor ring compared to state one, causing the clip to no longer bite the high-strength steel rod, as shown in Figure 16.

[0098] The function of the return spring is to prevent the high-strength steel rod from moving upward and driving the clip to move upward together.

[0099] In order to achieve the self-resetting characteristic, the initial prestress of the present invention is applied to the low prestress requirement self-resetting shear device, and the sum of the initial prestress applied to the low prestress requirement self-resetting device only needs to be 2-3% of the yield strength of the self-resetting shear wall.

[0100] Note: In this field, the so-called high-level prestressing refers to the initial prestressing that needs to be applied to the self-centering shear wall, which is about 50% of its yield strength.

[0101] Therefore, the present invention proposes a low-prestress, green, prefabricated, self-resetting wall. This solves the problem of self-resetting walls requiring high levels of prestress. It also avoids the disadvantage of prefabricated self-resetting walls experiencing localized damage due to lifting and collision at corners under earthquake loads, which reduces the wall's subsequent seismic redundancy. Furthermore, damaged components are easily replaced, allowing for rapid post-earthquake restoration. This prefabricated structure can be industrially produced in a factory and quickly installed on-site, resulting in a low cost and energy-saving and environmentally friendly solution.

[0102] The advantages of the present invention are:

[0103] (1) The construction difficulty is relatively low, and there is no need to post-tension the wall with a large amount of prestress to achieve self-reset;

[0104] (2) It avoids the loss of prestress caused by the long-term application of high-level prestress on the prefabricated self-resetting wall, which leads to unstable seismic performance;

[0105] (3) Avoid the problem of prefabricated self-resetting walls lifting and colliding under earthquake loads and the resulting local damage, which may lead to a reduction in subsequent seismic redundancy;

[0106] (4) The walls and columns are connected to each floor of the building, which can effectively control the inter-story displacement angle of each floor under seismic load to be the same, avoiding the decline of the overall seismic performance of the structure due to excessive lateral displacement of a certain floor;

[0107] (5) After the earthquake, the structural repair can be completed by replacing the energy-consuming components in the low-prestressed green prefabricated self-resetting wall, which reduces the cost of structural repair and shortens the repair time.

[0108] The above are typical examples of the present invention, and the implementation of the present invention is not limited to them.

[0109] The present invention has low construction difficulty and does not require a large amount of prestress to be applied to the entire wall to achieve self-reset. This avoids the loss of prestress caused by the long-term application of high-level prestress to the prefabricated self-reset wall, which leads to unstable seismic performance. It also avoids the problem of the prefabricated self-reset wall lifting and colliding under seismic loads, and the resulting local damage, which leads to a subsequent reduction in seismic redundancy. The walls and columns of the present invention are connected to each floor of the building, which can effectively control the structure to have the same inter-story displacement angle on each floor under seismic loads, avoiding a significant decrease in the overall seismic performance of the structure due to excessive lateral displacement of a certain floor. At the same time, it can effectively reduce the residual displacement response of the structure after an earthquake, shortening the time it takes to repair the structure after an earthquake.

Claims

1. A low prestressed green assembled self-resetting wall, characterized by: It comprises a hinged wall (1), a hinged support (2), a steel slide horizontal force transmission key (3), a low prestress demand self-resetting shearing device (4), and a concrete base (5), wherein: Hinge pillars (2) are arranged on both sides of the hinged wall (1), and steel slideway horizontal force transmission keys (3) and low prestress demand self-resetting shearing devices (4) are arranged alternately between the hinged wall (1) and the hinged pillars (2); The hinged wall (1) and the hinged support column (2) are both hingedly connected to the concrete base (5) at the bottom; Under earthquake load, the lateral force allows the hinged wall (1) and the hinged column (2) to rotate at the same angle through the steel slide horizontal force transmission key (3) and the low prestress demand self-resetting shear device (4); the steel slide horizontal force transmission key (3) and the low prestress demand self-resetting shear device (4) jointly control the rotation coordination of the hinged wall (1) and the hinged column (2), and the low prestress demand self-resetting shear device (4) dissipates the energy input into the structure and reduces the residual displacement of the structure after the earthquake through the self-resetting of the device.

2. The low prestressed green assembled self-resetting wall according to claim 1 is characterized in that: The hinged wall part (1) comprises a wall part (1-1), prestressed tendons (1-2), and a bottom hinge support (1-3): the wall part (1-1) is the main body, the prestressed tendons (1-2) are tensioned inside the wall part (1-1), the bottom hinge support (1-3) is arranged on a concrete base (5), the wall part (1-1) is connected to the bottom hinge support (1-3) through a steel section, the bottom hinge support (1-3) has a relatively small rigidity, and under the action of a lateral force, the wall part (1-1) will rotate around its bottom hinge support (1-3).

3. The low prestressed green assembled self-resetting wall according to claim 1 is characterized in that: The hinge support (2) comprises a column part (2-1) and a column foot visible hinge support (2-2): the column part (2-1) is the main body, the column foot visible hinge support (2-2) is arranged on a concrete base (5), the column part (2-1) is connected to the column foot visible hinge support (2-2), the column foot visible hinge support (2-2) has a relatively small rigidity, and under the action of lateral force, the column part (2-2) rotates around its column foot visible hinge support (2-2).

4. The low prestressed green assembled self-resetting wall according to claim 1 is characterized in that: The horizontal force transmission key (3) comprises a rod (3-1), a left part (3-2), and a right part (3-3), wherein: the rod (3-1) is realized by a screw and a nut, the left part (3-2) is designed in a T-shape, and the right part (3-3) is designed in a π-shape, the tongue of the T-shaped left part (3-2) is longitudinally provided with a long slide groove, and the two tongues of the π-shaped right part (3-3) are respectively provided with round holes; the rod (3-1) passes through the first round hole of the right part (3-3), the long slide groove of the left part (3-2), and the second round hole of the right part (3-3) in sequence through the screw, and is tightened and fixed at the other end by a nut; The horizontal force transmission key (3) is respectively fixed between the hinged wall (1) and the hinged support column (2) through its left component (3-2) and right component (3-3); Under earthquake load, the lateral force causes the hinged wall (1) and the hinged support (2) to rotate around their respective bottom visible hinged supports, causing shear dislocation of the left component (3-2) and the right component (3-3) connecting the two. At this time, the rod (3-1) freely slides vertically in the long slide groove of the left component (3-2), only transmitting horizontal force, controlling the hinged wall (1) and the hinged support (2) to rotate in coordination, and ensuring that the hinged wall (1) and the hinged support (2) have no out-of-plane offset.

5. The low prestressed green assembled self-resetting wall according to claim 1 is characterized in that: The low prestressing demand self-resetting shearing device (4) comprises an energy dissipation system, a self-resetting prestressing system, a bracket and a transmission mechanism, wherein the energy dissipation system and the self-resetting prestressing system are installed on the bracket and the transmission mechanism; The low prestress demand self-resetting shear-resistant device (4) is installed between the bottom hinged support wall (1) and the bottom hinged support column (2) through a bracket and a transmission mechanism; Under earthquake load, the lateral force causes the hinged wall (1) and the hinged support (2) to rotate around their respective bottom manifested hinged supports, and the low prestressed demand self-resetting shear device (4) connecting the two undergoes shear deformation; at this time, the energy dissipation system of the low prestressed demand self-resetting shear device (4) undergoes tensile yield deformation, while the prestressed screw (4-4) in the self-resetting prestressed system undergoes tensile elastic deformation and the disc spring group (4-5) undergoes compressive elastic deformation, and the low prestressed demand self-resetting shear device is reset through the restoring force generated by the deformation of the self-resetting prestressed system during the shear deformation, thereby driving the low prestressed green prefabricated self-resetting wall to complete the reset.

6. The low prestressed green assembled self-resetting wall according to claim 5 is characterized in that: The bracket and the transmission mechanism include an upper connecting component (4-7), a left connecting component (4-8), a right connecting component (4-9), an intermediate connecting component (4-10) and a lower connecting component (4-11): wherein the upper connecting component (4-7), the intermediate connecting component (4-10) and the lower connecting component (4-11) constitute a bracket for installing the self-resetting prestressed system and the energy dissipation system; wherein the two end surfaces of the upper connecting component (4-7) and the lower connecting component (4-11) determine the initial length L before the shear energy dissipation device is separated in the length direction; The left end connecting component (4-8) and the right end connecting component (4-9) form a movable nested structure, which is located between the upper end connecting component (4-7) and the middle connecting component (4-10), and is connected to the hinged wall (1) and the bottom hinged column part (2) through the wing part, and is used to input the shear dislocation and energy generated when the hinged wall (1) and the bottom hinged column part (2) rotate around their respective manifested hinge supports under the action of lateral force; The movable shaft of the movable nesting structure is arranged in the cavity of the upper connecting part (4-7), and the two wings extend from the side wall of the cavity. The upper and lower ends of the movable shaft are respectively in rigid contact with the upper connecting part (4-7) and the lower connecting part (4-11). After input shear dislocation, the movable nesting structure slides against each other in the axial direction, thereby pushing the upper connecting part (4-7) and the lower connecting part (4-11) to be relatively separated.

7. The low prestressed green assembled self-resetting wall according to claim 6, characterized in that: The upper end connecting component (4-7) has a main body which is a hollow cylinder, and the hollow cylinder is divided into two upper and lower open cavities by an intermediate plate (4-7-4), wherein a top connecting plate (4-7-14-7-1) is fixed at the top opening of the upper cavity (4-7-2), and the lower cavity (4-7-3) has an open bottom and side walls symmetrically grooved along the central axis of the cavity; The lower end connecting component (4-11) comprises a cylindrical rod (4-11-1) and a bottom connecting plate (4-11-2) fixed to the bottom of the cylindrical rod (4-11-1); An opening is provided in the center of the middle connecting component (4-10) for the lower cavity (4-7-3) of the upper connecting component (4-7) to pass through; The movable nested structure comprises a left end connecting component (4-8) and a right end connecting component (4-9), and the right end connecting component (4-9) is inserted into the left end connecting component (4-8) as an example; The left end connecting component (4-8) comprises a first cylinder (4-8-1) with a groove in the side wall, a first wing (4-8-2) and a first connecting plate (4-8-3), the first connecting plate (4-8-3) being connected to the wall (1-1) of the hinged wall (1) or the column (2-1) of the hinge support (2) by bolts, the first wing (4-8-2) being fixed to the outer wall of the first cylinder (4-8-1), and the side wall of the first cylinder (4-8-1) being provided with a groove; The right end connecting component (4-9) comprises a second cylinder (4-9-1), a second wing (4-9-2) and a second connecting plate (4-9-3); the second connecting plate (4-9-3) is connected to the wall (1-1) of the hinged wall (1) or the column (2-1) of the hinge support (2) by bolts; and the second wing (4-9-2) is fixed to the outer wall of the second cylinder (4-9-1); The first cylinder (4-8-1) and the second cylinder (4-9-1) are of the same height; The second cylinder (4-9-1) is placed inside the first cylinder (4-8-1) to form a movable shaft body of a movable nesting structure, and the second wing portion (4-9-2) extends from a groove on the side wall of the first cylinder (4-8-1), so that it and the first wing portion (4-8-2) on the other side of the movable shaft body form a pair of wing portions of the movable nesting structure; Conversely, the positions of the left and right end connecting parts are interchanged, and vice versa.

8. The low prestressed green assembled self-resetting wall according to claim 7, characterized in that: In the axial direction, i.e., the length direction, the movable nesting structure is placed in the lower cavity (4-7-3) of the upper connecting component (4-7), and the first wing (4-8-2) and the second wing (4-9-2) extend from the slots on both sides of the lower cavity (4-7-3) for connecting to the outside; the top of the movable shaft body of the movable nesting structure is in rigid contact with the middle plate (4-7-4) of the upper connecting component (4-7), and the bottom of the movable shaft body is placed on the top of the cylindrical rod (4-11-1) of the lower connecting component (4-11) and in rigid contact; the movable shaft body and the cylindrical rod (4-11-1) overlapped up and down are inserted together and limited in the lower cavity (4-7-3); under the input of external energy, the movable nesting structure slides against each other in the axial direction to promote the relative displacement of the upper connecting component (4-7) and the lower connecting component (4-11).

9. The low prestressed green assembled self-resetting wall according to claim 7, characterized in that: Width W of the first wing (4-8-2) 4-8,2 Smaller than the slot width W of the lower cavity (4-7-3) of the upper connecting component (4-7) 4-7 , the width W of the second wing (4-9-2) 4-9 At the same time, it is smaller than the slot width W of the first cylinder (4-8-1) of the left end connecting component (4-8) 4-8,1 The slot width W of the lower cavity (4-7-3) of the upper end connecting component (4-7) is 4-7 to ensure that the left end connecting component (4-8) and the right end connecting component (4-9) can shift relative to each other in the lower cavity (4-7-3).

10. The low prestressed green assembled self-resetting wall according to claim 7, characterized in that: The height H of the cylindrical rod (4-11-1) 4-11 The height H of the movable shaft 4-8 The sum is slightly greater than the height H of the lower cavity (4-7-3) of the upper connecting part 4-7 In order to ensure that the cylindrical rod (4-11-1) of the invention is always in the lower cavity (4-7-3) of the upper end connecting member (4-7) during operation, the height H of the movable shaft body is twice as large as 4-8 Smaller than the height H of the lower cavity (4-7-3) 4-7 , satisfying the following relationship: H 4-11 +H 4-8 ≥H 4-7 >2H 4-8 .

11. The low prestressed green assembled self-resetting wall according to claim 1, characterized in that: The energy dissipation system comprises more than two energy dissipation steel bars (4-1); The upper and lower ends of the energy-absorbing steel rod (4-1) are respectively fixed on the top connecting plate (4-7-1) of the upper end connecting component (4-7) and the middle connecting component (4-10).

12. The low prestressed green assembled self-resetting wall according to claim 1, characterized in that: The self-resetting prestressing system comprises a prestressing system and a self-resetting system: The prestressed system comprises a prestressed screw (4-4), a disc spring baffle (4-6) and a disc spring group (4-5), wherein the disc spring baffle (4-6) is arranged at the top of the disc spring group (4-5); the disc spring group (4-5) is composed of a plurality of disc springs connected in parallel, and the disc spring group (4-5) and the disc spring baffle (4-6) are arranged in an upper cavity (4-7-2) of an upper connecting component; The top connecting plate (4-7-1) of the upper connecting component (4-7), the second cylinder (4-9-1) of the right connecting component (4-9), the cylindrical rod (4-11-1) of the lower connecting component (4-11) and the bottom connecting plate (4-11-2) of the lower connecting component (4-11) are all provided with through holes in the center; the upper end of the prestressed screw (4-4) is fixed to the disc spring baffle (4-6), passes through the disc spring group (4-5) and the through holes of each connecting component in sequence, and is then fixed to the bottom connecting plate (4-11-2) of the lower connecting component (4-11); The self-resetting system comprises a self-locking clamp (4-2) and a high-strength steel rod (4-3); the self-locking clamp (4-2) is fixed on the middle connecting component (4-11), and the high-strength steel rod (4-3) is arranged between the middle connecting component (4-11) and the lower connecting component (4-11); specifically, the upper end of the high-strength steel rod (4-3) is connected to the self-locking clamp (4-2), and the lower end of the high-strength steel rod (4-3) is fixed on the bottom connecting plate (4-11-2) of the lower connecting component (4-11), together forming a one-way force transmission element.

13. The low prestressed green assembled self-resetting wall according to claim 12, characterized in that: The self-locking clamp (4-2) in the self-resetting system comprises an anchor ring (4-2-1), a clamp (4-2-2), an O-type rubber ring (4-2-3), a reset spring (4-2-4) and a gland assembly (4-2-5), wherein: The clamping piece (4-2-2) is composed of multiple pieces, which are built into the anchor ring (4-2-1) and enclosed outside the high-strength steel rod (4-3). A groove is reserved at the end thereof and an O-type rubber ring (4-2-3) is provided, so that the clamping piece (4-2-2) can work stably in the gap cavity between the anchor ring (4-2-1) and the high-strength steel rod (4-3). The return spring (4-2-4) is arranged on the upper part of the clamp (4-2-2), and the high-strength steel rod (4-3) passes through the return spring (4-2-4); The gland assembly (4-2-5) is arranged on the upper part of the anchor ring (4-2-1) and is used to support the return spring (4-2-4) to stabilize the axial direction during operation; When under tension, the self-locking clamp (4-2) bears the force by biting between the multiple enclosed clamping pieces (4-2-2) and the high-strength steel rod (4-3); and when under pressure, the clamping pieces (4-2-2) and the high-strength steel rod (4-3) are loosened, and relative sliding occurs with the high-strength steel rod (4-3) without bearing the force.

14. The low prestressed green assembled self-resetting wall according to claim 1 is characterized in that: The concrete base (5) is used to fix and install the hinged wall (1) and the hinged support column (2), and is usually arranged below the ground.

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