A snap-on pre-tensioned steel plate shear wall

Abstract

The present invention discloses a snap-on pre-tensioned steel plate shear wall, which belongs to the field of structural engineering technology. The structure is assembled by an embedded steel plate, an edge frame, a snap-on beam-plate connector and a fishplate. The snap-on beam-plate connector is installed between the lower edge of the embedded steel plate and the frame, which can realize a vertical displacement mechanism in which the steel plate is only stretched but not compressed. The pre-tightening force of the steel plate is applied by the proposed tensioning stress device. The snap-on pre-tensioned steel plate shear wall can reduce the vertical compressive stress of the steel plate or make the steel plate not bear compressive stress, delay or avoid premature out-of-plane buckling of the steel plate shear wall, and the amplitude of the out-of-plane deformation after buckling is small, which can play a role in protecting the functional and decorative surface layers on the wall, and improve the pinching problem of the hysteresis curve of the steel plate shear wall caused by out-of-plane buckling.

Description

Technical Field

[0001] The invention relates to a snap-on pre-tensioned steel plate shear wall, belonging to the technical field of structural engineering. Background Art

[0002] Steel plate shear walls, composed of embedded steel plates and edge frames, are prefabricated steel structural lateral-force-resisting components with the advantages of high cross-sectional bearing capacity, light weight, and good deformation ductility. However, in actual engineering applications, traditional unreinforced steel plate shear walls inevitably suffer from initial stress and deformation. During processing, processes such as forging, cutting, and welding result in uneven stress and heat distribution across the steel plates, leading to uneven plastic deformation within the steel plates. This often results in residual stress and deformation after processing. During transportation and hoisting, unreinforced thin steel plates, due to their inherent low out-of-plane height, are prone to out-of-plane deformation, resulting in poor dimensional accuracy of the installed wall panels and affecting the aesthetics of the building's surface paving and exterior facades. During normal use, frame beams and columns deform under vertical loads, which in turn causes the steel plates to experience vertical forces and some out-of-plane deformation. For steel plate shear walls, residual stresses can make the panels susceptible to brittle and fatigue failure, reducing the structure's bearing capacity and overall stability, and under certain conditions, affecting its seismic performance and safety. However, excessive initial out-of-plane deformation will greatly weaken the initial stiffness and shear buckling bearing capacity of the structure, causing inter-story displacement and out-of-plane deformation of the structure under relatively small horizontal loads. The above problems can be overcome well by applying pre-tension to the steel plate at the installation site. Applying pre-tension can transform the steel plate from a complex initial prestressed state to a state of vertical tension of the entire plate, effectively reducing the initial deformation and initial stress on the steel plate, improving the overall flatness of the steel plate surface, and making the steel plate approximately plane sheared at the initial stage of stress. The applied tension preload can also limit the out-of-plane buckling deformation of the steel plate, improve the out-of-plane stability of the steel plate shear wall, and have a favorable effect on the hysteretic performance of the steel plate shear wall. In view of the improvement of the performance of the steel plate shear wall by the pre-tensioning force, it is necessary to propose a pre-tensioned steel plate shear wall structure and its construction method to avoid the adverse effects of initial defects and improve the stress performance of the steel plate shear wall. Summary of the Invention

[0003] To overcome the shortcomings of the existing technology, the present invention provides a snap-on pre-tensioned steel plate shear wall. It includes:

[0004] edge frame;

[0005] snap-on beam-plate connectors fixed to the inner bottom surface of the edge frame;

[0006] Fish plates fixed to the top surface and two side surfaces of the edge frame;

[0007] an embedded steel plate fixed to the fishplate;

[0008] A tensile stress applying device is provided at the bottom edge of the steel plate.

[0009] The edge frame comprises an upper frame beam, a lower frame beam, and left and right frame columns, which are hoisted into a quadrilateral frame. The snap-on beam-plate connector comprises a latch and a base. The fishplate comprises an upper fishplate, a left fishplate, and a right fishplate. The snap-on beam-plate connector, the upper fishplate, the left fishplate, and the right fishplate are welded to the edge frame. The embedded steel plate is connected to the snap-on beam-plate connector and the fishplate via double-sided fillet welds. The tensioning stress applying device comprises an L-shaped clamp, an adjustment screw, and an adjustment nut. The tensioning stress applying device is secured to the bottom edge of the embedded steel plate via connecting bolts.

[0010] Furthermore, the length of the snap-on beam-plate connector is the clear span of the upper frame beam, and the snap-on connector is connected to the lower edge of the steel plate, which can realize a deformation mode in which the lower edge of the steel plate only moves upward and not downward.

[0011] Furthermore, the latch and base of the clip-on beam-plate connector are in a one-way sliding structure. The latch is welded to the bottom edge of the embedded steel plate, and the base is welded to the top surface of the lower frame beam. The three structural forms of the clip-on beam-plate connector are as follows:

[0012] (1) Snap-on beam-plate connector with serrations: Inverted triangular serrations are symmetrically arranged on both sides of the latch plate, and regular triangular serrations are symmetrically arranged on both sides of the inner groove of the base. The surfaces of the two serration structures fit perfectly together.

[0013] (2) Snap-on beam-plate connector with barbs: The cross-section of the pin is an arc-shaped plate with double-sided barbs, and the corresponding cross-section of the base is a single-sided barb.

[0014] (3) Snap-on beam-plate connector with movable barbs: The cross-section of the pin is a semi-arc plate, which is symmetrically arranged on both sides of the steel plate and fixed to the steel plate by a pin. The barbs can rotate freely on both sides of the steel plate and stop rotating downward when the semi-arc plate contacts the surface of the steel plate. The corresponding cross-section of the base is a single-sided barb.

[0015] Furthermore, the L-shaped clamping plates of the tension stress applying device are symmetrically arranged on both sides of the lower edge of the steel plate and fixed by connecting bolts. Corresponding bolt holes are provided on the vertical webs of the L-shaped clamping plates and the lower edge of the steel plate.

[0016] Furthermore, the L-shaped splint transverse web of the tensioning stress applying device is connected to the top flange of the lower frame beam by an adjusting screw, and corresponding screw bolt holes are provided on the L-shaped splint transverse web and the top flange of the lower frame beam.

[0017] Furthermore, a triangular stiffening plate is arranged on the L-shaped clamping plate of the tension stress applying device. Vertical stiffening ribs are arranged at a certain interval on both sides of the web of the lower frame beam.

[0018] Furthermore, the adjustment nut is rotated to change the distance between the tension stress applying device and the lower frame beam to apply tension stress to the steel plate.

[0019] Compared with the prior art, the main advantages of the present invention are:

[0020] The present invention provides a snap-on pre-tensioned steel plate shear wall structure, which has the advantages that the proposed vertical stress applying device is simple in structure and easy to operate, and the vertical stress tensioning operation of the steel plate shear wall can be completed efficiently and conveniently at the installation site. The steel plate shear wall after pre-tensioning overcomes the initial deformation and initial stress problems existing in ordinary steel plate shear walls, improves the flatness of the steel plate surface, and makes the steel plate sheared in an approximate state at the initial stage of stress, thus having a higher initial stiffness and elastic buckling bearing capacity. Through reasonable design, the pre-tensioned steel plate shear wall can ignore the influence of the additional vertical stress generated by the frame beams and frame columns on the steel plate shear wall during use. When the horizontal load is low, the steel plate is not prone to buckling vibration, which effectively protects the functional surface layer and decorative surface layer of the wall wrapped with the steel plate, avoids the wall deformation and cracking that may occur during normal use, and improves the comfort of building use. In terms of stress performance, compared with ordinary steel plate shear walls, pre-stressed steel plate shear walls have higher initial bearing capacity, the tensile field strength after buckling is more fully developed, and the ultimate bearing capacity is slightly higher than that of ordinary steel plate shear walls. At the same time, the tensioning force is opposite to the bulging direction of the steel plate, which plays a role in restraining the out-of-plane buckling deformation of the steel plate, overcoming the pinching problem of the hysteresis curve of the steel plate shear wall to a certain extent and improving the energy consumption performance of the wall panel. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 Schematic diagram of a snap-on pre-tensioned steel plate shear wall according to the present invention, wherein (a) is a front view and (b) is a cross-sectional view;

[0022] Figure 2 Schematic diagram of the connection between the steel plate and the bottom frame, (a) is connection form 1; (b) is connection form 2; (c) is connection form 3;

[0023] Figure 3 Detailed drawing of the connection between the steel plate and the bottom frame;

[0024] Figure 4 It is the relationship curve between the vertical stress ratio of the steel plate and the axial compression ratio of the column;

[0025] Figure 5 This is the relationship curve between the maximum out-of-plane deformation of the steel plate and the column axial compression ratio. DETAILED DESCRIPTION

[0026] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. All other embodiments obtained by ordinary technicians in this field based on the embodiments of the present invention without making any creative efforts shall fall within the scope of protection of the present invention.

[0027] like Figure 1 As shown, the present invention proposes a snap-in pre-tensioned steel plate shear wall, comprising an upper frame beam 1, a lower frame beam 2, a left frame column 3 and a right frame column 4, a snap-in beam-plate connector 5, an upper fishplate 6, a left fishplate 7, a right fishplate 8, an embedded steel plate 9, and a tensioning stress applying device 10; the upper frame beam 1, the lower frame beam 2, the left frame column 3 and the right frame column 4 are hoisted into a quadrilateral frame; the snap-in beam-plate connector 5 comprises: a pin 5-1 and a base 5-2; the snap-in beam-plate connector 5, the lower fishplate 6, the left fishplate 7, and the right fishplate 8 are respectively welded in the quadrilateral frame; the snap-in beam-plate connector 5, the lower fishplate 6, the left fishplate 7, and the right fishplate 8 are welded to the embedded steel plate 9; vertical stiffening ribs 11 are arranged on both sides of the web of the lower frame beam 1 at a certain interval. The length of the snap-on beam-plate connector 5 is equal to the clear span of the upper frame beam 1 .

[0028] like Figure 2 As shown, the snap-on connector 5 is connected to the lower edge of the steel plate in three structural forms as follows:

[0029] (1) Snap-on beam-plate connector with serrations ( Figure 2 (a)): The latch plate 5-1 is symmetrically provided with inverted triangle serrations on both sides, and the inner groove formed by the first base 5-2 and the second base 5-3 is symmetrically provided with regular triangle serrations on both sides, and the surfaces of the two serration structures are completely fitted together.

[0030] (2) Clip-on beam-plate connector with barb ( Figure 2 (b)): The cross-section of the latch 5-1 is an arc-shaped plate with double-sided barbs, and the corresponding cross-sections of the first base 5-2 and the second base 5-3 are single-sided barbs.

[0031] (3) Clip-on beam-plate connector with movable barb ( Figure 2 (c)): The cross-section of the latch 5-1 is a semi-arc plate, which is symmetrically arranged on both sides of the steel plate and fixed to the steel plate by a pin. The latch 5-1 can rotate freely on both sides of the steel plate and stops when the semi-arc plate contacts the surface of the steel plate 9. The corresponding cross-section of the first base 5-2 and the second base 5-3 is a single-sided hook.

[0032] like Figure 3As shown, the tension stress applying device 10 includes: an L-shaped clamp 10-1, an adjusting screw 10-2 (i.e., an adjusting screw), an adjusting nut 10-3, a connecting bolt 10-5, and a triangular stiffening plate 10-4. The L-shaped clamps 10-1 of the tension stress applying device 10 are symmetrically arranged on both sides of the lower edge of the steel plate 9 and fixed by connecting bolts 10-5. Corresponding bolt holes are provided on the vertical webs of the L-shaped clamps 10-1 and the lower edge of the steel plate 9. The transverse webs of the L-shaped clamps 10-1 of the tension stress applying device 10 are connected to the top flange of the lower frame beam 2 by the adjusting screw 10-2. Corresponding screw bolt holes are provided on the transverse webs of the L-shaped clamps 10-1 and the top flange of the lower frame beam 2. A triangular stiffening plate 10-4 is arranged on the L-shaped clamp 10-1 of the tension stress applying device 10.

[0033] At the construction site, the tension stress applying device 10 is installed on the embedded steel plate 9. The distance between the tension stress applying device 10 and the lower frame beam 2 is changed by rotating the adjustment nut 10-3 to apply tension stress to the steel plate 9. The calculation method of the adjustment distance d can be determined by the following formula:

[0034]

[0035] Among them, μ p is the vertical stress ratio of the steel plate, f y is the design value of the tensile yield strength of the steel plate, H is the net height of the steel plate, and E is the elastic modulus of the steel plate. After the prestressing is completed, the tensile stress applying device needs to be removed.

[0036] like Figure 4 and Figure 5 As shown in the figure, compared with the steel plate shear wall without prestressing, the clip-on pre-tensioned steel plate shear wall has lower vertical compressive stress of the steel plate, smaller out-of-plane deformation amplitude, and larger axial compression ratio of the frame column corresponding to buckling. This shows that applying pre-tensioning force can reduce the vertical compressive stress of the steel plate or make the steel plate not bear compressive stress, delay or avoid premature out-of-plane buckling of the steel plate shear wall, and effectively reduce the out-of-plane deformation amplitude, thereby protecting the functional and decorative surface layers on the wall and improving the pinching problem of the hysteresis curve of the steel plate shear wall caused by out-of-plane buckling.

Claims

1. A snap-on pre-tensioned steel plate shear wall, characterized in that: include: edge frame; snap-on beam-plate connectors fixed to the inner bottom surface of the edge frame; Fish plates fixed to the top surface and two side surfaces of the edge frame; an embedded steel plate fixed to the fishplate; A tension stress applying device provided at the bottom edge of the embedded steel plate; The edge frame comprises: an upper frame beam, a lower frame beam, a left frame column and a right frame column, wherein the upper frame beam, the left frame column, the lower frame beam and the right frame column are hoisted into a quadrilateral frame; The snap-on beam-plate connector includes: a latch and a base; The latch and the base in the snap-on beam-plate connector are in a one-way sliding structure, the latch is welded to the bottom edge of the embedded steel plate, and the base is welded to the top surface of the lower frame beam.

2. The snap-on pre-tensioned steel plate shear wall according to claim 1, characterized in that: The three structural forms of the snap-on beam-plate connector are as follows: (1) Snap-on beam-plate connector with serrations: Inverted triangular serrations are symmetrically arranged on both sides of the latch plate, and regular triangular serrations are symmetrically arranged on both sides of the inner groove of the base. The surfaces of the two serration structures are completely fitted together; (2) Snap-on beam-plate connector with barbs: The cross-section of the pin is a curved plate with double-sided barbs, and the corresponding cross-section of the base is a single-sided barb; (3) Snap-on beam-plate connector with movable barbs: The cross-section of the pin is a semi-arc plate, which is symmetrically arranged on both sides of the embedded steel plate and fixed to the embedded steel plate by a pin shaft. The corresponding cross-section of the base is a single-sided barb.

3. The snap-on pre-tensioned steel plate shear wall according to claim 1, characterized in that: The fishplate includes: an upper fishplate, a left fishplate, and a right fishplate; The snap-on beam-plate connector, the upper fishplate, the left fishplate, and the right fishplate are welded within the edge frame; The embedded steel plate is connected to the snap-on beam-plate connector and the fishplate by double-sided fillet welds.

4. The snap-on pre-tensioned steel plate shear wall according to claim 1, characterized in that: The tensile stress applying device includes: an L-shaped clamping plate, an adjusting screw, an adjusting nut and a connecting bolt, and the embedded steel plate is fixed to the bottom of the edge frame by the connecting bolt.

5. The snap-on pre-tensioned steel plate shear wall according to claim 4, characterized in that: The L-shaped clamping plates are symmetrically arranged on both sides of the lower edge of the embedded steel plate, and the connecting bolts pass through the vertical webs of the L-shaped clamping plates and the embedded steel plate for fixing.

6. The snap-on pre-tensioned steel plate shear wall according to claim 4, characterized in that: The adjusting screw passes through the transverse web of the L-shaped clamping plate and the top flange of the lower frame beam, and then both ends are fixed by the adjusting nuts.

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