Energy-consuming fabricated hollow shear wall with embedded columns and construction method

Abstract

The invention discloses an energy-consuming fabricated hollow shear wall with embedded columns and a construction method. The energy-consuming fabricated hollow shear wall comprises a prefabricated hollow shear wall body with the embedded columns on the upper portion, a prefabricated hollow shear wall body with the embedded columns on the lower portion, disc spring devices, brackets and laminated slabs. The upper hollow shear wall body with the embedded columns and the lower hollow shear wall body with the embedded columns are rapidly centered and positioned through the upper U-shaped steel plate and the lower U-shaped steel plate, the upper U-shaped steel plate and the lower U-shaped steel plate provide friction energy consumption, the disc spring device has high anti-pressure capacity and can restore to the state before deformation after unloading, restoring force is provided for the wall body, and the safety of the wall body is improved. The post-earthquake residual deformation of the structure is reduced; the bracket is arranged to be connected with the laminated slab, parallel pouring is adopted for post-pouring, ultra-high performance concrete is poured on the upper portion of the bracket, common concrete is poured on the upper portion of the laminated slab, and the ultra-high performance concrete and the common concrete have good shear resistance and tensile property. The structure node is clear in force transmission and reasonable in stress, the post-earthquake damage and residual deformation of the structure can be reduced, and the later repair cost is low.

Description

Technical Field

[0001] The invention belongs to the field of building structures and relates to an assembled hollow shear wall with energy dissipation belt and concealed columns and a construction method. Background Art

[0002] Shear walls are widely used in the field of prefabricated buildings because of their high bearing capacity, high rigidity, and high lateral rigidity. With the development of building industrialization and the country's encouragement of the research and development of new prefabricated structures, prefabricated hollow shear wall prefabricated structural systems have emerged. Prefabricated hollow shear wall prefabricated structural systems are based on prefabricated shear wall prefabricated structural systems. A series of horizontal and vertical holes are opened inside the wall along the horizontal and height directions of the wall. Without weakening the advantages of the prefabricated shear wall structure, it has the advantages of light weight and small reaction under earthquake action. It has a very broad application prospect in low-rise and multi-story buildings.

[0003] The technical core of prefabricated structure is to solve the connection problem. The connection between the upper and lower layers of prefabricated shear wall directly affects the integrity of the structure and is the key to structural safety. The connection between prefabricated shear wall components must meet the requirements of structural bearing capacity and seismic performance, and the connection parts must have sufficient rigidity and good recovery force. At present, the traditional vertical connection methods of prefabricated shear walls are mainly grouting sleeves and grout anchor overlap. The grouting sleeve connection method requires the injection of high-strength grouting materials, which requires a high level of technical skills for industrial workers and is difficult to inspect for quality. Grout anchor overlap requires a reserved connection hole to be set at one end of the prefabricated component, but the quality of the hole is not easy to guarantee and it is easy to form a stiffness weakening zone. The above connection methods have too many wet operations for on-site pouring, and the demand for concrete is large. The structural system lacks seismic measures and is difficult to cope with the stress conditions under complex loads. The structure cannot achieve ductility design through energy-consuming cracks, which is not conducive to the stability of the main structure. Therefore, they are not suitable for the vertical connection of prefabricated hollow shear walls, and the hidden column connection is also a problem that needs to be solved urgently. Therefore, it is necessary to develop a connection node suitable for prefabricated hollow shear walls with hidden columns. Summary of the invention

[0004] In view of the deficiencies in the prior art, the purpose of the present invention is to provide an assembled hollow shear wall with hidden columns and an energy-absorbing belt and a construction method, so as to solve the problems that the existing structural system lacks earthquake-proof measures, is difficult to cope with the stress conditions under complex loads, the structure cannot achieve ductile design through energy-absorbing cracks, and is not conducive to the stability of the main structure. The structural nodes of the present invention have clear force transmission and reasonable force, can reduce post-earthquake damage and residual deformation of the structure, and have low later repair costs.

[0005] In order to solve the above technical problems, the present invention adopts the following technical solutions to achieve the above problems:

[0006] An energy dissipation assembled hollow shear wall with concealed columns, comprising a prefabricated upper hollow shear wall with concealed columns, a prefabricated lower hollow shear wall with concealed columns, a disc spring device, a corbel and a composite plate;

[0007] The prefabricated upper hollow shear wall with concealed columns comprises a wall body I, a concealed column I and an upper U-shaped steel plate; the concealed columns I are respectively located on both sides of the wall body I, the upper U-shaped steel plate opening faces upward, the lower part of the wall body I is embedded in the upper U-shaped steel plate and the two are detachably fixedly connected;

[0008] The prefabricated hollow shear wall with hidden columns at the bottom includes a wall II, hidden columns II and a lower U-shaped steel plate; the hidden columns II are respectively located on both sides of the wall II, the lower U-shaped steel plate is opened upward and its bottom is detachably fixedly connected to the top surface of the wall II;

[0009] The prefabricated lower hollow shear wall with hidden columns is located directly below the prefabricated upper hollow shear wall with hidden columns, the hidden column II is located below the hidden column I and is opposite to each other, the upper U-shaped steel plate is embedded in the lower U-shaped steel plate and the two are detachably fixedly connected; the disc spring device is arranged between the hidden column I and the hidden column II;

[0010] The corbel and the composite slab are horizontally arranged on one side of the prefabricated lower hollow shear wall with concealed columns. Ordinary concrete is poured on the upper part of the composite slab, and ultra-high performance concrete is poured on the upper part of the corbel. After pouring, the plate surface elevation of the corbel and the composite slab is consistent with the elevation of the prefabricated lower hollow shear wall with concealed columns.

[0011] The present invention also includes the following technical features:

[0012] Specifically, the side of the wall I is provided with a side embedded sleeve near the bottom, the bottom surface of the wall I is provided with a bottom embedded sleeve; the top surface of the wall II is provided with a top embedded sleeve;

[0013] The upper U-shaped steel plate is provided with a side reserved bolt through hole I and a bottom reserved bolt through hole I; the lower U-shaped steel plate is provided with a side reserved bolt through hole II and a bottom reserved bolt through hole II.

[0014] Specifically, the side embedded sleeve is opposite to the side reserved bolt through hole I and the side reserved bolt through hole II, the bottom embedded sleeve is opposite to the bottom reserved bolt through hole I; the top embedded sleeve is opposite to the bottom reserved bolt through hole II.

[0015] Specifically, the upper U-shaped steel plate and the wall I are connected and fixed by passing high-strength bolts through the bottom reserved bolt through hole I and the bottom embedded sleeve; the lower U-shaped steel plate and the wall II are connected and fixed by passing high-strength bolts through the bottom reserved bolt through hole II and the top embedded sleeve.

[0016] Specifically, the connection between the wall I and the wall II is achieved by embedding the upper U-shaped steel plate into the lower U-shaped steel plate, and by connecting and fixing the high-strength bolts through the side reserved bolt holes I and the side reserved bolt holes II with the side embedded sleeves.

[0017] Specifically, the disc spring device includes an upper connecting steel plate, an upper connecting plate bolt hole, an upper retaining steel plate, an outer steel pipe, an inner steel pipe, a disc spring, a lower connecting steel plate, and a lower connecting plate bolt hole;

[0018] The upper connecting steel plate can be detachably fixed to the bottom surface of the hidden column I, and the lower connecting steel plate can be detachably fixed to the top surface of the hidden column II, and the upper connecting steel plate is opposite to the lower connecting steel plate; the upper connecting steel plate is provided with an upper connecting plate bolt hole, and the lower connecting steel plate is provided with a connecting plate bolt hole; the lower part of the upper connecting steel plate is welded with an outer steel pipe, the disc spring is sleeved on the inner steel pipe and the upper part of the disc spring is located inside the outer steel pipe, the upper baffle steel plate is welded to the top of the inner steel pipe, and is separated from the outer steel pipe and the disc spring, and the bottom of the disc spring is against the lower connecting steel plate.

[0019] Specifically, a bottom pre-buried sleeve is provided at the bottom of the hidden column I; a top pre-buried sleeve is provided at the top of the hidden column II;

[0020] The disc spring device and the concealed column I are connected and fixed by passing high-strength bolts through the reserved bolt holes of the upper connecting plate and the bottom embedded sleeve; the disc spring device and the concealed column II are connected and fixed by passing high-strength bolts through the reserved bolt holes of the lower connecting plate and the top embedded sleeve.

[0021] Specifically, U-shaped stirrups are reserved at the top of the corbel; longitudinal stress-bearing steel bars are reserved at the ends of the composite slab; the composite slab is cast in parallel after the distribution reinforcement of the composite slab and the longitudinal reinforcement of the corbel are laid by placing the reserved longitudinal stress-bearing steel bars on the top of the corbel.

[0022] The energy dissipation belt concealed column assembled hollow shear wall construction method comprises the following steps:

[0023] Step 1: Prepare the prefabricated upper hollow shear wall with concealed columns, the prefabricated lower hollow shear wall with concealed columns, the disc spring device, the corbel and the composite slab according to the seismic performance requirements;

[0024] Step 2: Use high-strength bolts to connect and fix the wall I and the upper U-shaped steel plate through the reserved bolt holes of the upper U-shaped steel plate and screw them into the embedded sleeve at the bottom of the wall I. Use high-strength bolts to connect and fix the wall II and the lower U-shaped steel plate through the reserved bolt holes of the lower U-shaped steel plate and screw them into the embedded sleeve at the top of the wall II.

[0025] Step 3: Hoist and fix the prefabricated lower hollow shear wall with concealed columns, hoist the composite slab, place the reserved longitudinal force-bearing steel bars of the composite slab on the top surface of the corbel, and then lay the distribution bars of the composite slab, the negative bars of the support and the longitudinal bars of the corbel;

[0026] Step 4: Pour ordinary concrete and ultra-high performance concrete in parallel, control the elevation to be flush with the top elevation of the prefabricated lower hollow shear wall with concealed columns, remove the formwork, and perform maintenance;

[0027] Step 5: Hoist the prefabricated upper hollow shear wall with concealed columns, insert the upper U-shaped steel plate into the lower U-shaped steel plate, and when the upper U-shaped steel plate is completely inserted into the lower U-shaped steel plate, screw the high-strength bolts through the reserved bolt holes of the upper U-shaped steel plate and the lower U-shaped steel plate into the embedded sleeve on the side of the wall body I;

[0028] Step six: Use high-strength bolts to connect and fix the hidden column I and the disc spring device through the reserved bolt holes on the upper connecting plate and screw them into the embedded sleeve at the bottom of the hidden column I. Use high-strength bolts to connect and fix the hidden column II and the disc spring device through the reserved bolt holes on the connecting plate and screw them into the embedded sleeve at the top of the hidden column II.

[0029] Compared with the prior art, the present invention has the following technical effects:

[0030] (1) The assembled hollow shear wall with concealed columns connected by the present invention has no reinforcement on all four sides, making it easy to realize the industrialization of high-rise shear wall building structures; the hollow shear wall, composite slab and connecting device are all prefabricated in the factory and are easy to hoist during the construction process, thereby improving labor productivity and reducing construction costs.

[0031] (2) The closed hollow structure of the present invention effectively reduces the deadweight of the structure and improves the thermal insulation performance of the wall.

[0032] (3) The prefabricated hollow shear wall with concealed columns of the present invention is provided with a corbel connected with the composite slab, and the post-casting adopts parallel casting. The upper part of the corbel is cast with ultra-high performance concrete, and the upper part of the composite slab is cast with ordinary concrete. The ultra-high performance concrete and ordinary concrete have good shear resistance and tensile resistance.

[0033] (4) The prefabricated upper hollow shear wall with concealed columns and the prefabricated lower hollow shear wall with concealed columns of the present invention can be quickly aligned and positioned through the upper U-shaped steel plate and the lower U-shaped steel plate, thereby improving assembly efficiency.

[0034] (5) The connection between the prefabricated upper hollow shear wall with concealed columns and the prefabricated lower hollow shear wall with concealed columns of the present invention adopts dry connection, which can reduce the amount of building materials used, achieve the effect of energy saving and emission reduction, low carbon consumption reduction, and saving construction time.

[0035] (6) The upper U-shaped steel plate and the lower U-shaped steel plate of the present invention provide friction energy dissipation, and the disc spring device has a high compressive resistance and can return to the state before deformation after unloading, thereby providing restoring force for the wall and reducing the residual deformation of the structure after earthquake.

[0036] (7) The upper U-shaped steel plate, the lower U-shaped steel plate and the disc spring device of the present invention are all replaceable devices. If the node area is severely damaged or fails, they can be replaced more conveniently, thereby reducing maintenance and repair costs. BRIEF DESCRIPTION OF THE DRAWINGS

[0037] Figure 1 It is a schematic diagram of the front structure of the energy-dissipating assembled hollow shear wall with concealed columns according to the present invention.

[0038] Figure 2 For along Figure 1 AA cross-section diagram of .

[0039] Figure 3 Detail of the upper precast shear wall.

[0040] Figure 4 Detail of the lower precast shear wall.

[0041] Figure 5 for Figure 1 Enlarged schematic diagram at point A in the middle.

[0042] Figure 6 Detailed drawing of the composite slab and corbel before pouring.

[0043] Figure 7 The hysteresis performance of the disc spring device.

[0044] Figure 8 It is the modified Kent-Park concrete model.

[0045] Fig. 9 is the model boundary condition.

[0046] Fig.10 Loading system.

[0047] Fig.11 It is the overall finite element model of cast-in-place hollow shear wall.

[0048] Fig.12 The overall finite element model of the energy-absorbing assembled hollow shear wall with concealed columns.

[0049] Fig.13 Equivalent plastic strain distribution of cast-in-place hollow shear wall.

[0050] Fig.14 Equivalent plastic strain distribution of energy-dissipating prefabricated hollow shear wall with concealed columns.

[0051] Fig.15 For hysteresis curve comparison.

[0052] The meaning of each number in the figure is:

[0053] 1. Wall I, 2. Wall II, 3. Composite plate, 4. Hidden column I, 5. Corbel, 6. Disc spring device, 7. Hidden column II, 8. High-strength bolts, 11. Upper U-shaped steel plate, 111. Side reserved bolt through hole I, 112. Bottom reserved bolt through hole I, 13. Bottom embedded sleeve, 14. Side embedded sleeve, 21. Lower U-shaped steel plate, 211. Side reserved bolt through hole II, 212. Bottom Reserved bolt through hole II, 23. Top embedded sleeve, 31. Longitudinal force-bearing steel bars, 32. Distribution bars, 41. Bottom embedded sleeve, 51. U-shaped stirrups, 52. Longitudinal bars, 61. Upper connecting steel plate, 611. Upper connecting plate bolt hole, 62. Lower connecting steel plate, 621. Lower connecting plate bolt hole, 63. Upper baffle steel plate, 64. Outer steel pipe, 65. Disc spring, 66. Inner steel pipe, 71. Top embedded sleeve. DETAILED DESCRIPTION

[0054] Specific embodiments of the present invention are given below. It should be noted that the present invention is not limited to the following specific embodiments, and all equivalent changes made on the basis of the technical solution of this application fall within the protection scope of the present invention.

[0055] Embodiment 1:

[0056] like Figures 1 to 6 As shown, this embodiment provides an energy-absorbing assembled hollow shear wall with concealed columns, including a prefabricated upper hollow shear wall with concealed columns, a prefabricated lower hollow shear wall with concealed columns, a disc spring device 6, a corbel 5 and a composite plate 3.

[0057] The prefabricated upper hollow shear wall with hidden columns includes a wall body I1, hidden columns I4 and an upper U-shaped steel plate 11; the vertical hidden columns I4 are respectively located on both sides of the wall body I1, the upper U-shaped steel plate 11 is opened upward, the lower part of the wall body I1 is embedded in the upper U-shaped steel plate 11, and the two are detachably fixedly connected.

[0058] The prefabricated lower hollow shear wall with hidden columns includes a wall II2, hidden columns II7 and a lower U-shaped steel plate 21; the vertical hidden columns II7 are respectively located on both sides of the wall II2, the lower U-shaped steel plate 21 is opened upward and its bottom is detachably fixedly connected to the top surface of the wall II2.

[0059] The prefabricated lower hollow shear wall with concealed columns is located directly below the prefabricated upper hollow shear wall with concealed columns. The concealed columns II7 are located below the concealed columns I4 and face each other. The upper U-shaped steel plate 11 is embedded in the lower U-shaped steel plate 21 and the two are detachably fixedly connected. The upper U-shaped steel plate and the lower U-shaped steel plate can be quickly aligned and positioned to improve assembly efficiency. The disc spring device 6 is provided between the concealed columns I4 and II7. The combination of the upper U-shaped steel plate, the lower U-shaped steel plate and the disc spring device can provide friction energy dissipation and reduce the residual deformation of the structure after the earthquake. The upper U-shaped steel plate, the lower U-shaped steel plate and the disc spring device are replaceable to reduce maintenance and repair costs.

[0060] The corbel 5 and the composite slab 3 are horizontally arranged on one side of the prefabricated lower hollow shear wall with concealed columns. Ordinary concrete is poured on the upper part of the composite slab 3, and ultra-high performance concrete is poured on the upper part of the corbel 5. After pouring, the plate surface elevations of the corbel 5 and the composite slab 3 are consistent with the elevation of the prefabricated lower hollow shear wall with concealed columns.

[0061] A side embedded sleeve 14 is provided on the side of the wall I1 near the bottom, and a bottom embedded sleeve 13 is provided on the bottom surface of the wall I1; a top embedded sleeve 23 is provided on the top surface of the wall II2; the upper U-shaped steel plate 11 is provided with a side reserved bolt through hole I111 and a bottom reserved bolt through hole I112; the lower U-shaped steel plate 21 is provided with a side reserved bolt through hole II211 and a bottom reserved bolt through hole II212.

[0062] The side embedded sleeve 14 is opposite to the side reserved bolt through hole I111 and the side reserved bolt through hole II211, the bottom embedded sleeve 13 is opposite to the bottom reserved bolt through hole I112; the top embedded sleeve 23 is opposite to the bottom reserved bolt through hole II212.

[0063] The upper U-shaped steel plate 11 and the wall I1 are connected and fixed by passing the high-strength bolts 8 through the bottom reserved bolt holes I112 and the bottom embedded sleeves 13; the lower U-shaped steel plate 21 and the wall II2 are connected and fixed by passing the high-strength bolts 8 through the bottom reserved bolt holes II212 and the top embedded sleeves 23.

[0064] The connection between the wall I1 and the wall II2 is achieved by embedding the upper U-shaped steel plate 11 into the lower U-shaped steel plate 21, and by connecting and fixing the high-strength bolts 8 with the side embedded sleeves 14 through the side reserved bolt holes I111 and the side reserved bolt holes II211.

[0065] The disc spring device 6 comprises an upper connecting steel plate 61, an upper connecting plate bolt hole 611, an upper retaining steel plate 63, an outer steel pipe 64, an inner steel pipe 66, a disc spring 65, a lower connecting steel plate 62, and a lower connecting plate bolt hole 621; the upper connecting steel plate 61 can be detachably fixed to the bottom surface of the hidden column I4, and the lower connecting steel plate 62 can be detachably fixed to the top surface of the hidden column II7, and the upper connecting steel plate 61 is opposite to the lower connecting steel plate 62; the upper connecting steel plate 61 is reserved with an upper connecting plate bolt hole 611, and the lower connecting steel plate 62 is reserved with a connecting plate bolt hole 621; the lower part of the upper connecting steel plate 61 is welded with the outer steel pipe 64, the disc spring 65 is sleeved on the inner steel pipe 66 and the upper part of the disc spring 65 is located in the outer steel pipe 64, the upper retaining steel plate 63 is welded to the top of the inner steel pipe (66), and is separated from the outer steel pipe (64) and the disc spring (65), and the bottom of the disc spring 65 is against the lower connecting steel plate 62.

[0066] A bottom embedded sleeve 41 is provided at the bottom of the hidden column I4; a top embedded sleeve 71 is provided at the top of the hidden column II7; the disc spring device 6 and the hidden column I4 are connected and fixed by the high-strength bolt 8 passing through the reserved upper connecting plate bolt hole 611 and the bottom embedded sleeve 41; the disc spring device 6 and the hidden column II7 are connected and fixed by the high-strength bolt 8 passing through the reserved lower connecting plate bolt hole 621 and the top embedded sleeve 71.

[0067] A U-shaped stirrup 51 is reserved at the top of the corbel 5; a longitudinal stress-bearing steel bar 31 is reserved at the end of the composite slab 3; the composite slab 3 is poured in parallel after laying the distribution bars 32 of the composite slab 3 and the longitudinal bars 52 of the corbel 5 by placing the reserved longitudinal stress-bearing steel bar 31 on the top of the corbel 5. The assembled hollow shear wall with concealed columns adopts the connection method of the corbel and the composite slab, and the post-casting adopts parallel pouring. The upper part of the corbel is poured with ultra-high performance concrete, and the upper part of the composite slab is poured with ordinary concrete. The ultra-high performance concrete and ordinary concrete have good shear and tensile properties.

[0068] Embodiment 2:

[0069] This embodiment provides a construction method for an energy dissipation belt concealed column assembled hollow shear wall, comprising the following steps:

[0070] Step 1: Prepare prefabricated upper hollow shear walls with concealed columns, prefabricated lower hollow shear walls with concealed columns, disc spring devices, corbels and composite plates according to the seismic performance requirements; prefabricated components, upper U-shaped steel plates, lower U-shaped steel plates, and disc spring devices are all fully manufactured by the factory and transported to the site, and the components must not be damaged during transportation;

[0071] Step 2: Use high-strength bolts to connect and fix the wall I and the upper U-shaped steel plate through the reserved bolt holes of the upper U-shaped steel plate and screw them into the embedded sleeve at the bottom of the wall I. Use high-strength bolts to connect and fix the wall II and the lower U-shaped steel plate through the reserved bolt holes of the lower U-shaped steel plate and screw them into the embedded sleeve at the top of the wall II.

[0072] Step 3: Hoist and fix the prefabricated lower hollow shear wall with concealed columns, hoist the composite slab, place the reserved longitudinal force-bearing steel bars of the composite slab on the top surface of the corbel, and then lay the distribution bars of the composite slab, the negative bars of the support and the longitudinal bars of the corbel;

[0073] Step 4: Pour ordinary concrete and ultra-high performance concrete in parallel, control the elevation to be flush with the top elevation of the prefabricated lower hollow shear wall with concealed columns, remove the formwork, and perform maintenance;

[0074] Step 5: Hoist the prefabricated upper hollow shear wall with concealed columns, insert the upper U-shaped steel plate into the lower U-shaped steel plate, and when the upper U-shaped steel plate is completely inserted into the lower U-shaped steel plate, screw the high-strength bolts through the reserved bolt holes of the upper U-shaped steel plate and the lower U-shaped steel plate into the embedded sleeve on the side of the wall body I;

[0075] Step six: Use high-strength bolts to connect and fix the hidden column I and the disc spring device through the reserved bolt holes on the upper connecting plate and screw them into the embedded sleeve at the bottom of the hidden column I. Use high-strength bolts to connect and fix the hidden column II and the disc spring device through the reserved bolt holes on the connecting plate and screw them into the embedded sleeve at the top of the hidden column II.

[0076] The finite element model of cast-in-place hollow shear wall and the finite element model of new energy-absorbing assembled hollow shear wall with concealed columns were established in MSC.Marc. The wall was simulated by layered shell elements, the element type was No. 75 shell element, and it was divided into multiple layers along the thickness direction of the shell element. The longitudinal and transverse steel bars were simulated by setting orthogonal anisotropic steel bar layers in different principal axis directions. The concrete in the edge constraint zone was simulated by layered shell elements, and the longitudinal steel bars were simulated by No. 9 truss elements. The steel bar elements were embedded in the concrete elements through the "Inserts" function to achieve deformation coordination between the steel bar truss elements and the concrete shell elements, and the bond slip between the steel bars and the concrete was ignored. The loading beam and the foundation beam were used to simulate the constraint effect of the floor slab or other layers of the wall in the structure and the consolidation of the bottom of the foundation wall respectively; the loading beam and the foundation beam were shell elements, and the wall and the foundation beam and the loading beam were simulated by sharing nodes. The disc spring device was simulated by spring elements, and the two ends of the spring unit were connected to the wall by sharing nodes to simulate the fixed connection between the upper and lower connecting plates of the disc spring device and the embedded steel plate in the wall. The restoring force model of the disc spring device is as follows Figure 7 The upper and lower U-shaped steel plates of the wall are simulated by shell elements, and conventional contact properties are used between the two. The friction coefficient of the contact surface is 0.17, and the central bolt of the U-shaped steel is defined as a "hinge" to simulate relative rotation.

[0077] The concrete material adopts the Von Mises yield criterion and isotropic hardening criterion, and the uniaxial compressive constitutive relationship adopts the modified Kent-Park model to consider the restraint effect of stirrups on concrete ( Figure 8 ). The steel bar material adopts the Von Mises yield criterion and the kinematic hardening criterion, and the uniaxial tension constitutive relation adopts the Wang Xunliu model. The Poisson's ratio is 0.3.

[0078] The vertical load of the model is divided into 5 equal parts and applied to each node on the top of the loading beam, and it is kept constant during the entire loading process. The horizontal load is added to the side of the loading beam ( Fig. 9 ). For the loading system, the loading is controlled by force first, and displacement control is adopted after yielding. The displacement value when the specimen yields is used as the displacement increment of each level, and each displacement loading cycle is repeated three times. The convergence condition adopts the relative residual force and relative displacement convergence criteria, and the allowable limit of convergence error is set to 0.01; the loading method selects a fixed time step, and the nonlinear analysis considers large deformation ( Fig.10 ).

[0079] The finite element model of cast-in-place hollow shear wall and the overall finite element model of the new energy-dissipating assembled hollow shear wall with concealed columns are as follows: Fig.11 , Fig.12 The equivalent plastic strain distribution of the two shear wall models at failure is shown in Fig.13 , 14 The hysteresis curves of the two shear walls are shown in Figure 2. Fig.15 shown.

[0080] It can be seen that the installation of disc spring devices at the foot of the walls on both sides can effectively provide reset capability and dissipate seismic energy through the deformation of the wall itself or additional friction; at the same time, it can reduce the residual deformation of the wall and the degree of damage to the wall foot.

Claims

1. An energy-absorbing hollow shear wall with concealed columns. It is characterized in that It comprises a prefabricated upper hollow shear wall with concealed columns, a prefabricated lower hollow shear wall with concealed columns, a disc spring device (6), a corbel (5) and a composite plate (3); The prefabricated upper hollow shear wall with concealed columns comprises a wall body I (1), concealed columns I (4) and an upper U-shaped steel plate (11); the concealed columns I (4) are respectively located on both sides of the wall body I (1); the upper U-shaped steel plate (11) is opened upward; the lower part of the wall body I (1) is embedded in the upper U-shaped steel plate (11) and the two are detachably fixedly connected; The prefabricated hollow shear wall with concealed columns at the bottom comprises a wall body II (2), concealed columns II (7) and a lower U-shaped steel plate (21); the concealed columns II (7) are respectively located on both sides of the wall body II (2); the lower U-shaped steel plate (21) is opened upward and its bottom is detachably fixedly connected to the top surface of the wall body II (2); The prefabricated lower hollow shear wall with concealed columns is located directly below the prefabricated upper hollow shear wall with concealed columns, the concealed columns II (7) are located below the concealed columns I (4) and are opposite to each other, the upper U-shaped steel plate (11) is embedded in the lower U-shaped steel plate (21) and the two are detachably fixedly connected; the disc spring device (6) is arranged between the concealed columns I (4) and II (7); The corbel (5) and the composite slab (3) are horizontally arranged on one side of the prefabricated lower hollow shear wall with concealed columns. Ordinary concrete is poured on the upper part of the composite slab (3), and ultra-high performance concrete is poured on the upper part of the corbel (5). After pouring, the plate surface elevations of the corbel (5) and the composite slab (3) are consistent with the elevation of the prefabricated lower hollow shear wall with concealed columns.

2. The energy dissipation zone concealed column assembled hollow shear wall according to claim 1, It is characterized in that The side surface of the wall body I (1) is provided with a side embedded sleeve (14) near the bottom, and the bottom surface of the wall body I (1) is provided with a bottom surface embedded sleeve (13); the top surface of the wall body II (2) is provided with a top surface embedded sleeve (23); The upper U-shaped steel plate (11) is provided with a side reserved bolt through hole I (111) and a bottom reserved bolt through hole I (112); the lower U-shaped steel plate (21) is provided with a side reserved bolt through hole II (211) and a bottom reserved bolt through hole II (212).

3. The energy dissipation zone concealed column assembled hollow shear wall as claimed in claim 2, It is characterized in that The side embedded sleeve (14) is opposite to the side reserved bolt through hole I (111) and the side reserved bolt through hole II (211); the bottom surface embedded sleeve (13) is opposite to the bottom reserved bolt through hole I (112); and the top surface embedded sleeve (23) is opposite to the bottom reserved bolt through hole II (212).

4. The energy dissipation zone concealed column assembled hollow shear wall as claimed in claim 3, It is characterized in that The upper U-shaped steel plate (11) and the wall body I (1) are connected and fixed by passing high-strength bolts (8) through the bottom reserved bolt through holes I (112) and the bottom surface embedded sleeves (13); the lower U-shaped steel plate (21) and the wall body II (2) are connected and fixed by passing high-strength bolts (8) through the bottom reserved bolt through holes II (212) and the top surface embedded sleeves (23).

5. The energy dissipation zone concealed column assembled hollow shear wall as claimed in claim 3, It is characterized in that The connection between the wall body I (1) and the wall body II (2) is achieved by embedding the upper U-shaped steel plate (11) into the lower U-shaped steel plate (21), and by connecting and fixing the high-strength bolts (8) through the side reserved bolt through holes I (111) and the side reserved bolt through holes II (211) with the side embedded sleeves (14).

6. The energy dissipation zone concealed column assembled hollow shear wall according to claim 1, It is characterized in that The disc spring device (6) comprises an upper connecting steel plate (61), an upper connecting plate bolt hole (611), an upper retaining steel plate (63), an outer steel pipe (64), an inner steel pipe (66), a disc spring (65), a lower connecting steel plate (62), and a lower connecting plate bolt hole (621); The upper connecting steel plate (61) can be detachably fixed to the bottom surface of the hidden column I (4), and the lower connecting steel plate (62) can be detachably fixed to the top surface of the hidden column II (7), and the upper connecting steel plate (61) is opposite to the lower connecting steel plate (62); an upper connecting plate bolt hole (611) is reserved on the upper connecting steel plate (61), and a connecting plate bolt hole (621) is reserved on the lower connecting steel plate (62); the lower part of the upper connecting steel plate (61) is welded to the outer steel pipe (64), the disc spring (65) is sleeved on the inner steel pipe (66) and the upper part of the disc spring (65) is located in the outer steel pipe (64), the upper retaining steel plate (63) is welded to the top of the inner steel pipe (66), and is separated from the outer steel pipe (64) and the disc spring (65), and the bottom of the disc spring (65) is against the lower connecting steel plate (62).

7. The energy dissipation zone concealed column assembled hollow shear wall according to claim 6, It is characterized in that The bottom of the concealed column I (4) is provided with a bottom pre-buried sleeve (41); the top of the concealed column II (7) is provided with a top pre-buried sleeve (71); The disc spring device (6) and the concealed column I (4) are connected and fixed by passing a high-strength bolt (8) through a reserved upper connection plate bolt hole (611) and a bottom embedded sleeve (41); the disc spring device (6) and the concealed column II (7) are connected and fixed by passing a high-strength bolt (8) through a reserved lower connection plate bolt hole (621) and a top embedded sleeve (71).

8. The energy dissipation zone concealed column assembled hollow shear wall according to claim 1, It is characterized in that A U-shaped stirrup (51) is reserved at the top of the corbel (5); a longitudinal stress-bearing steel bar (31) is reserved at the end of the composite slab (3); the composite slab (3) is cast in parallel after the distribution bars (32) of the composite slab (3) and the longitudinal bars (52) of the composite slab (5) are laid by placing the reserved longitudinal stress-bearing steel bar (31) on the top of the corbel (5).

9. The construction method of the energy dissipation zone concealed column assembled hollow shear wall according to any one of claims 1 to 8, It is characterized in that The steps include: Step 1: Prepare the prefabricated upper hollow shear wall with concealed columns, the prefabricated lower hollow shear wall with concealed columns, the disc spring device, the corbel and the composite slab according to the seismic performance requirements; Step 2: Use high-strength bolts to connect and fix the wall I and the upper U-shaped steel plate through the reserved bolt holes of the upper U-shaped steel plate and screw them into the embedded sleeve at the bottom of the wall I. Use high-strength bolts to connect and fix the wall II and the lower U-shaped steel plate through the reserved bolt holes of the lower U-shaped steel plate and screw them into the embedded sleeve at the top of the wall II. Step 3: Hoist and fix the prefabricated lower hollow shear wall with concealed columns, hoist the composite slab, place the reserved longitudinal force-bearing steel bars of the composite slab on the top surface of the corbel, and then lay the distribution bars of the composite slab, the negative bars of the support and the longitudinal bars of the corbel; Step 4: Pour ordinary concrete and ultra-high performance concrete in parallel, control the elevation to be flush with the top elevation of the prefabricated lower hollow shear wall with concealed columns, remove the formwork, and perform maintenance; Step 5: Hoist the prefabricated upper hollow shear wall with concealed columns, insert the upper U-shaped steel plate into the lower U-shaped steel plate, and when the upper U-shaped steel plate is completely inserted into the lower U-shaped steel plate, screw the high-strength bolts through the reserved bolt holes of the upper U-shaped steel plate and the lower U-shaped steel plate into the embedded sleeve on the side of the wall body I; Step six: Use high-strength bolts to connect and fix the hidden column I and the disc spring device through the reserved bolt holes on the upper connecting plate and screw them into the embedded sleeve at the bottom of the hidden column I. Use high-strength bolts to connect and fix the hidden column II and the disc spring device through the reserved bolt holes on the connecting plate and screw them into the embedded sleeve at the top of the hidden column II.

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