Segmental self-resetting rocking wall and construction method

Abstract

The present invention relates to a segmented self-resetting swing wall and a construction method, comprising a swing wall body arranged on a foundation, the swing wall body being formed by at least two layers of swing wall substrates being connected in sequence from bottom to top, a plurality of reserved channels being pre-buried in the longitudinal direction of the upper edge of the swing wall substrate, a through hole matching the reserved channels being opened on the base, prestressed tendons being passed through the reserved channels, anchors being arranged at both ends of the prestressed tendons, steel bars being pre-buried in the lower end of the swing wall substrate, the lower ends of the embedded steel bars extending out of the swing wall substrate, embedded steel caps being pre-buried on the upper side surfaces of the foundation and the remaining swing wall substrates except the topmost layer of the swing wall substrate, the front and rear sides of the bottommost layer of the swing wall substrate being connected to the foundation via energy-absorbing parts, the swing wall adopts a segmented design, the single body is small in size and convenient to transport and hoist, the seismic response of the overall structure can be reduced, the internal force of the swing wall body in an earthquake can be effectively reduced, and the premature destruction of the wall where the force is greater can be avoided, thereby losing the effectiveness of the wall.

Description

Technical Field

[0001] The present invention relates to a segmented self - resetting rocking wall and a construction method thereof. Background Art

[0002] The frame - rocking wall structure system is composed of one or several rocking walls with large lateral stiffness, hinged to the foundation at the bottom and having a certain rotation ability, and the side is connected to the main structure, and the main frame. In traditional frame structures, weak stories often occur during earthquakes, resulting in a story damage mechanism; by adding rocking walls with relatively large lateral stiffness to the frame structure, the generation of weak stories can be inhibited, and the inter - story displacement of the frame can be restricted to be more uniform, which is conducive to the uniform development of plastic hinges throughout the frame, especially at the beam ends.

[0003] However, the existing design of rocking walls still has the following disadvantages: The rocking wall usually adopts the design of a whole - section wall, and its force is similar to that of a simply - supported beam placed vertically. The internal force of the wall is relatively large, and it is often prone to failure first, resulting in the loss of the effectiveness of the wall, thus losing the seismic energy - dissipation function of the rocking wall; Since the lateral stiffness of the self - contained wall segment of the rocking wall is relatively large, after the rocking wall is set, the inter - story displacement of each floor of the structure can be made more uniform, but this will also cause the inter - story displacement of the top floor of the original frame structure to become larger when using the rocking wall to reinforce the existing frame structure, resulting in serious damage to the top floor; Since the whole - section rocking wall increases the lateral stiffness of the overall structure, the base shear force of the overall structure during an earthquake increases, and the seismic response of the overall structure increases; In addition, due to the particularity of the rocking - wall body, the wall often needs to be prefabricated in advance. The whole wall arranged along the full height of the structure will cause difficulties in transportation and hoisting due to the large size of the wall. Summary of the Invention

[0004] The present invention provides a segmented self - resetting rocking wall and a construction method thereof.

[0005] The solution adopted by the present invention to solve the technical problem is that a segmented self - resetting rocking wall includes a rocking - wall body arranged on a foundation. The rocking - wall body is formed by at least two layers of rocking - wall bases connected in sequence from bottom to top. A number of reserved holes are pre - embedded longitudinally on the rocking - wall base. Through - holes matching the reserved holes are opened on the base. Prestressing tendons are inserted into the reserved holes. Anchor devices are installed at both the upper and lower ends of the prestressing tendons. The upper anchor device abuts against the upper side of the rocking - wall body, and the lower anchor device abuts against the lower side of the foundation. A vertically - arranged embedded steel bar is pre - embedded inside the lower end of the rocking - wall base, and the lower end of the embedded steel bar extends out of the rocking - wall base. Except for the top - most rocking - wall base, embedded steel caps that can be inserted with the embedded steel bars are pre - embedded on the upper side of the remaining rocking - wall bases and the upper side of the foundation.

[0006] Furthermore, the front and rear sides of the bottom-layer swing wall base are connected to the foundation through energy dissipation components. The energy dissipation components include a number of energy dissipation steel bars vertically arranged in the middle of the outer side of the lower end of the swing wall base. The upper and lower ends of the energy dissipation steel bars are respectively connected to the side surface of the swing wall base and the foundation through anchor fittings.

[0007] Furthermore, chamfered corners are provided at the two corners of the lower end of the swing wall base, and high-ductility elastic materials are filled in the chamfered corners.

[0008] Furthermore, a cushion layer is provided between the bottom-layer swing wall base and the foundation, and a cushion layer is provided between adjacent swing wall bases.

[0009] A construction method for a segmented self-centering swing wall includes the following steps:

[0010] Step 1: Prefabricate the swing wall base, chamfer the two sides of the lower end of the swing wall base, then fill the chamfered corners with high-ductility elastic materials, and connect the filled high-ductility elastic materials to the swing wall base.

[0011] Step 2: Transport the swing wall base to the construction site for hoisting.

[0012] Step 3: Hoist the swing wall base and vertically assemble the swing wall bases and the foundation between the upper and lower ones together.

[0013] Step 4: Thread prestressing tendons into the reserved ducts, install anchor fittings at the upper and lower ends of the prestressing tendons. The upper-side anchor fitting abuts against the upper side surface of the swing wall body, and the lower-side anchor fitting abuts against the lower side surface of the foundation.

[0014] Step 5: Connect the front and rear sides of the bottom-layer swing wall base to the foundation through energy dissipation components.

[0015] In Step 3, first lay a cushion layer at the position on the foundation where the swing wall base is to be placed, and then after hoisting each swing wall base, lay a cushion layer on the upper surface of the swing wall base.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The structure is simple, with a segmented design. The single body has a small size, which is convenient for transportation and hoisting. It can reduce the seismic response of the overall structure, effectively reduce the base shear force of the structure, effectively reduce the internal force of the swing wall wall body during an earthquake, avoid premature failure at the location where the wall body is subjected to large forces and loss of the effectiveness of the wall body, make the inter-story displacements of each floor of the structure tend to be evenly distributed, reduce the inter-story displacement increased by arranging a whole-section swing wall at the top floor of the structure, and avoid the situation of serious damage to the top floor of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] The following further describes the present invention in conjunction with the drawings.

[0018] Figure 1This is a structural schematic diagram of a segmented self-resetting rocking wall.

[0019] In the figure: 1-foundation; 2-sway wall base; 3-reserved channel; 4-prestressed tendons; 5-anchor; 6-embedded steel rod; 7-embedded steel cap; 8-energy-absorbing steel rod; 9-anchor; 10-corner cutting part; 11-cushion. DETAILED DESCRIPTION

[0020] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0021] like Figure 1 As shown, a segmented self-resetting rocking wall comprises a rocking wall body arranged on a foundation 1, wherein the rocking wall body is formed by connecting multiple layers of rocking wall substrates 2 in sequence from bottom to top, wherein a plurality of reserved channels 3 are pre-buried in the longitudinal direction of the rocking wall substrate, a through hole matching the reserved channels is opened on the base, a prestressed tendon 4 is passed through the reserved channels, anchors 5 are installed at both ends of the prestressed tendon, the upper anchor abuts against the upper side of the rocking wall body, and the lower anchor abuts against the lower side of the foundation, a vertical pre-buried steel rod 6 is pre-buried inside the lower end of the rocking wall substrate, the selected pre-buried steel rod is arranged in the middle of the lower end of the rocking wall substrate, the lower end of the pre-buried steel rod extends out from the rocking wall substrate, and except for the topmost rocking wall substrate, the upper side of the remaining rocking wall substrates and the upper side of the foundation are pre-buried with embedded steel caps 7 that can be plugged with the pre-buried steel rods, and rocking surfaces are formed between adjacent rocking wall substrates and between the rocking wall substrate of the bottom layer and the foundation;

[0022] The segmented design enables the swaying wall to form multiple swaying nodes from bottom to top. The wall deforms in a concentrated manner through the swaying nodes during the swaying process, which reduces the plastic deformation of the wall and effectively reduces the internal force of the wall, thus avoiding the longitudinal steel bars in the middle of the wall from yielding prematurely due to excessive internal force, leading to the destruction of the wall.

[0023] In this embodiment, in order to further increase the energy consumption of the wall, the front and rear sides of the lowest rocking wall base are connected to the foundation through energy-absorbing parts. The energy-absorbing parts include a plurality of energy-absorbing steel bars 8 vertically arranged in the middle of the outer side of the lower end of the rocking wall base. The upper and lower ends of the energy-absorbing steel bars are respectively connected to the side surface of the rocking wall base and the foundation through anchors 9. As the bottom rocking surface opens and closes, it deforms to consume energy, thereby consuming a certain amount of earthquake energy to protect the main structure. At the same time, the energy-absorbing parts are arranged on the bottom surface of the wall to concentrate the deformation and energy consumption of the wall at the expected position, thereby reducing the risk of damage to other parts and the uncertainty of damage to other parts, thereby reducing the loss of life and property. Moreover, the energy-absorbing parts are easy to replace in time after the earthquake, thereby improving the efficiency of post-earthquake building structure recovery.

[0024] In this embodiment, chamfered portions 10 are provided at two corners at the lower end of the swing wall base body. High-ductility elastic materials, such as rubber materials, are filled in the chamfered portions to prevent the corner concrete from being prematurely damaged during the swinging of the wall. The connection and installation between the high-ductility elastic material and the wall can be achieved through high-strength bonding materials for bonding connection.

[0025] In this embodiment, a cushion layer 11 is provided between the lowermost swing wall base body and the foundation, and cushion layers are provided between adjacent swing wall base bodies.

[0026] A construction method for a segmented self-centering swing wall includes the following steps:

[0027] Step 1: Prefabricate the swing wall base body, chamfer the two sides at the lower end of the swing wall base body, then fill the chamfered portions with high-ductility elastic materials, and connect the filled high-ductility elastic materials to the swing wall base body. The high-ductility elastic material and the swing wall base body are connected by bonding or other connection methods well-known to those skilled in the art;

[0028] Step 2: Transport the swing wall base body to the construction site for hoisting;

[0029] Step 3: Hoist the swing wall base body and vertically assemble the swing wall base bodies and the foundation above and below together;

[0030] Step 4: Thread prestressing tendons into the reserved ducts, install anchorages at the upper and lower ends of the prestressing tendons. The upper anchorage abuts against the upper side of the swing wall body, and the lower anchorage abuts against the lower side of the foundation;

[0031] Step 5: Connect the front and rear sides of the lowermost swing wall base body to the foundation through energy dissipation members.

[0032] In Step 3, first lay a cushion layer at the position on the foundation where the swing wall base body is to be placed, and then lay a cushion layer on the upper surface of the swing wall base body after each hoisting of a swing wall base body.

[0033] This design uses prestressing tendons to enable the structure to have better self-centering ability during earthquakes and reduce residual displacements. The prestressing tendons adopt a design of unbonded post-tensioning. Prestressing tendon ducts are embedded in the swing wall base body, and prestressing tendon anchorages are preset at the top of the foundation and the swing wall base body. The prestressing tendons pass through the ducts embedded in the wall and are respectively anchored at the top of the wall and the foundation. The anchorage at the top of the wall, such a design can ensure that when the swing wall body swings, during the process of the opening gap on each swing surface, the internal stress of the prestressing tendons increases, providing a better restoring force for the swing wall body.

[0034] In this design, the shear resistance design of the swing nodes between adjacent swing surfaces adopts embedded steel bars and embedded steel caps, ensuring that the steel bars are inserted into the steel cups during the swing of the wall, thereby achieving the shear resistance effect. The embedded steel bars and embedded steel caps are arranged in the middle of the swing wall matrix to form swing nodes, reducing the internal force of the swing wall body, alleviating the design requirements, and at the same time reducing the risk of wall failure caused by longitudinal bar yield during a major earthquake; the size of the steel bar inserted into the steel cap and the diameter of the steel cap are designed according to the maximum swing design value of the swing wall, ensuring that the steel bar can still be combined with the steel cap when the wall undergoes the maximum swing, achieving the shear resistance effect, ensuring that the wall has good shear resistance in both in-plane and out-of-plane directions, and at the same time ensuring stable swing of the wall in the vertical direction.

[0035] The design can be applied to newly built ordinary building structures to improve the seismic capacity of the structure, or it can also be used for seismic reinforcement of existing building structures. During use, the swing wall body of the design is connected to each floor of the frame structure through horizontal connection nodes, and the bottom of the swing wall is connected to the foundation. During an earthquake, the swing wall is used to control the inter-story deformation of the frame structure to improve the seismic capacity of the original frame structure.

[0036] This segmented self-centering swing wall can reduce the seismic response of the overall structure and effectively reduce the base shear force of the structure. Setting prestressed tendons in the swing wall can improve the self-centering ability of the wall, but it also increases the lateral stiffness of the structure, resulting in an increase in the base shear force of the structure during an earthquake. The treatment method of segmenting the swing wall weakens the integrity of the wall, avoids the situation where the overall structure stiffness increases too much due to the additional integral swing wall, and can effectively reduce the increase amplitude of the base shear force of the overall structure after adding the swing wall.

[0037] This segmented self-centering swing wall can effectively reduce the internal force of the swing wall body during an earthquake. By adding one or more swing surfaces in the middle of the wall, the entire wall is divided into two or more wall segments, that is, the swing wall matrix, which can effectively reduce the internal force, maximum bending moment, and maximum shear force of the wall, reduce the strength and stiffness requirements of the swing wall, avoid premature failure at the location where the wall is subjected to large forces and the loss of the effectiveness of the wall, and is conducive to achieving no damage to the swing wall during an earthquake, thereby extending the service life of the swing wall.

[0038] This segmented self-centering rocking wall can effectively reduce the inter-story drift of the top floor of the structure. Although adding a monolithic rocking wall to the frame structure can make the distribution of inter-story deformations of the overall structure more uniform in each floor, it will also cause a sudden increase in the inter-story drift of the top floor of the structure, which is not beneficial to the top floor of the structure. Especially for the existing structure strengthened with a rocking wall, since the design conditions such as the reinforcement of each floor of the existing structure have been determined, and the beam-column section sizes and reinforcements of the top floor are often smaller than those of the lower floors. When the inter-story drift of the top floor increases, it may lead to a more serious hinge formation in the beam-columns of the top floor. If more plastic hinges appear at the column ends, it may also form a new weak story on the top floor, which is not conducive to the seismic performance of the structure. After segmenting the rocking wall, the inter-story drift of the floor where the upper wall segment is located can be reduced, and the serious hinge formation on the top floor can be avoided.

[0039] In this design, segmenting the wall body of the rocking wall can effectively reduce the difficulties in transportation and hoisting construction of the precast rocking wall. Due to the particularity of the wall body of the rocking wall, the wall body often needs to be precast in advance. Combining the rocking wall with the precast and assembled technology will have great application prospects. By segmenting the wall body, the difficulties in transportation and hoisting caused by the too large wall body size during precast and installation can be avoided.

[0040] If this patent discloses or involves mutually fixedly connected components or structural members, then, unless otherwise stated, the fixed connection can be understood as: a detachable fixed connection (such as using bolts or screws for connection), or it can also be understood as: a non-detachable fixed connection (such as riveting, welding). Of course, the mutually fixedly connected components can also be replaced by an integral structure (such as manufactured by integral forming using casting technology) (except when it is obviously impossible to adopt the integral forming process).

[0041] In the description of this patent, it should be understood that the orientation or positional relationship indicated by the terms "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing this patent, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation to this patent.

[0042] The above-mentioned preferred embodiments have further detailed the purpose, technical solution and advantages of the present invention. It should be understood that the above description is only the preferred embodiments of the present invention, and is not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A segmented self-resetting rocking wall, comprising a rocking wall body arranged on a foundation, Features: The swing wall body is formed by at least two layers of swing wall bases connected in sequence from bottom to top, a plurality of reserved channels are embedded in the upper longitudinal direction of the swing wall base, a through hole matching the reserved channels is opened on the base, prestressed tendons are passed through the reserved channels, anchors are installed at both ends of the prestressed tendons, the upper anchors are against the upper side of the swing wall body, and the lower anchors are against the lower side of the foundation, a vertical embedded steel rod is embedded inside the lower end of the swing wall base, and the lower end of the embedded steel rod extends out of the swing wall base, and except for the topmost swing wall base, the upper side of the remaining swing wall bases and the side of the foundation are embedded with embedded steel caps that can be plugged into the embedded steel rods; The front and rear sides of the rocking wall base at the lowest level are connected to the foundation via energy-absorbing parts, and the energy-absorbing parts include a plurality of energy-absorbing steel bars vertically arranged in the middle of the outer side of the lower end of the rocking wall base, and the upper and lower ends of the energy-absorbing steel bars are respectively connected to the side surface of the rocking wall base and the foundation via anchors; A cushion layer is provided between the lowest rocking wall base and the foundation, and cushion layers are provided between adjacent rocking wall bases; The embedded steel rods and embedded steel caps are arranged in the middle of the swing wall base to form swing nodes, so that the swing wall body forms multiple swing nodes from bottom to top, and the swing wall body is deformed concentratedly through the swing nodes during the swinging process.

2. The segmented self-resetting rocking wall according to claim 1, Features: Two corners at the lower end of the rocking wall base are provided with cut corners, and the cut corners are filled with high-ductility elastic material.

3. A construction method of a segmented self-resetting rocking wall, using the segmented self-resetting rocking wall as claimed in claim 2, It is characterized in that The following steps are involved: Step 1: prefabricate the swing wall base, perform corner cutting on both sides of the lower end of the swing wall base, then fill the corners with high-ductility elastic material, and connect the filled high-ductility elastic material with the swing wall base; Step 2: Transport the swing wall base to the construction site for hoisting; Step 3: Lift the swing wall base, and assemble the swing wall base and foundation vertically between the upper and lower parts; Step 4: Insert the prestressed tendons in the reserved channels, and install anchors at the upper and lower ends of the prestressed tendons, with the upper anchors against the upper side of the swing wall body and the lower anchors against the lower side of the foundation; Step 5: Connect the front and rear sides of the lowest rocking wall base to the foundation through energy-absorbing parts.

4. The construction method according to claim 3, Features: In step 3, a cushion layer is first laid on the location where the swing wall base is placed on the foundation, and then a cushion layer is laid on the upper surface of each swing wall base after each swing wall base is hoisted.

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