Frp hybrid reinforced coupled shear wall structure with replaceable components

Abstract

A recoverable function FRP hybrid reinforcement hybrid shear wall structure with replaceable wall foot components and replaceable coupling beam components, comprising a wall limb, a replaceable coupling beam, a replaceable wall foot, a floor, and a lower constraint beam. The replaceable coupling beam of the shear wall comprises two non-replaceable concrete coupling beam segments at the ends and a replaceable energy-dissipation H-shaped steel beam segment in the middle. A gap is provided between the upper floor of the coupling beam and the coupling beam, and no connection is processed. The replaceable wall foot is provided with a new type of friction energy dissipation device, which resists tension through friction and resists compression through steel pipe concrete and friction. An internal steel truss is additionally arranged at the bottom of the wall limb of the shear wall. Longitudinal stress reinforcement of the wall body is in the form of FRP hybrid reinforcement with a strength gradient. The damage and energy dissipation of this new type of shear wall structure system are mainly concentrated in the replaceable coupling beam and the replaceable wall foot. The unbonding treatment between the floor and the coupling beam reduces the damage of the floor. The internal steel truss improves the shear capacity of the replaceable area of the wall body. The FRP reinforcement is always in the elastic stage, which ensures the self-resetting performance of the wall body. The FRP hybrid shear wall with replaceable wall foot components and replaceable coupling beam components has the characteristics of excellent bearing capacity, energy dissipation and self-resetting performance.

Description

Technical Field

[0001] This invention relates to the field of building engineering, specifically to a recoverable functional structural system, and more specifically to a recoverable functional FRP hybrid reinforced coupled shear wall structure with replaceable wall base members and replaceable connecting beam members. Background Technology

[0002] Shear walls are core seismic-resistant components of reinforced concrete high-rise buildings. Their main seismic damage phenomena include: shear-compression failure or crushing failure of the base wall, out-of-plane instability of the wall, buckling and fracture of longitudinal reinforcement in edge members, X-shaped cracks in coupling beams at shear wall openings, irreparable damage to coupling beams after an earthquake, difficulty in repairing edge members of the shear wall, and inability to eliminate residual deformation in the shear wall. Therefore, it is essential to abandon the traditional design concept of shear walls and develop "seismic-resistant shear walls with rapid post-earthquake recovery function" that minimize wall damage, shorten repair time, and reduce economic repair costs.

[0003] Both fully GFRP-reinforced and CFRP-reinforced concrete shear walls have good self-resetting capabilities, but their ductility and energy dissipation capacity are relatively poor. The ductility of the wall depends on the ductility of the compressive concrete at the foot of the shear wall. FRP-reinforced concrete shear walls have excellent residual deformation performance, but the wall damage is not minor, and the concrete at the foot of the wall is severely damaged. After an earthquake, the shear wall may not be able to achieve rapid functional recovery.

[0004] There is limited research on concrete shear walls with replaceable bases both domestically and internationally, and the types of replaceable base components used are limited. Current experimental research results on concrete shear walls with replaceable bases indicate that the replaceable bases only participate in the load-bearing and energy dissipation processes. These shear walls may exhibit failure characteristics such as yielding of the longitudinal reinforcement, crushing of the concrete inside the replaceable base, and tensile cracking of the concrete above the replaceable base. Furthermore, the overall residual displacement of existing concrete shear walls with replaceable bases after earthquakes is relatively large.

[0005] Coupling beams, as the first line of defense against earthquakes in coupled shear wall structures, bear the crucial responsibility of dissipating seismic energy. However, ordinary reinforced concrete coupling beams are highly susceptible to brittle shear failure under seismic loads, resulting in a significant reduction in their energy dissipation capacity and, in some cases, even damage to the wall limbs. Replaceable concrete coupling beams, as a novel type of energy-dissipating component, not only greatly increase the energy dissipation capacity of coupling beams but also significantly improve the post-earthquake recoverability of coupled shear wall structures.

[0006] Introducing energy-dissipating components into coupling beams increases their deformation under seismic loads and affects the floor slab above them. Current research on replaceable coupling beams rarely considers the damage they cause to the floor slab. Summary of the Invention

[0007] This invention addresses the shortcomings of existing technologies by proposing a recoverable functional FRP hybrid reinforced coupled shear wall structure with replaceable wall base components and replaceable coupling beam components. Its main structural features are: replaceable concrete coupling beams using energy-dissipating I-beam segments, eliminating the connection between the floor slab and the coupling beam to reduce the strain on the connection; a replaceable novel friction energy dissipator replaces the easily damaged reinforced concrete area at the shear wall base, with the friction energy dissipator connected to the shear wall via pre-embedded connectors; a steel truss is built into the bottom region of the wall to prevent localized stress concentration near the embedded components from causing damage to the non-replaceable parts, while also compensating for the reduced lateral stiffness and shear capacity due to the weakening of the replaceable area; three forms of longitudinal reinforcement are available for the wall: GFRP reinforcement in the wall limbs - CFRP reinforcement in concealed columns; GFRP in the middle of the wall limbs - CFRP reinforcement on both sides of the middle of the wall limbs - CFRP reinforcement in concealed columns; and GFRP in the middle of the wall limbs - CFRP reinforcement on both sides of the middle of the wall limbs - CFRP reinforcement in concealed columns.

[0008] The technical solution of the present invention is: a reversible functional FRP hybrid reinforced coupled shear wall with replaceable wall base components and replaceable connecting beam components, including wall limbs, replaceable connecting beams, replaceable wall bases, and floor slabs;

[0009] The reinforcement of the wall limb includes longitudinal reinforcement and horizontal reinforcement; the longitudinal reinforcement includes longitudinal distribution reinforcement of the wall body and longitudinal reinforcement of the concealed column; the horizontal reinforcement includes horizontal distribution reinforcement of the wall body and stirrups of the concealed column.

[0010] The longitudinal reinforcement adopts three mixed reinforcement forms: the longitudinal reinforcement of the concealed column uses CFRP bars and the longitudinal distribution bars of the wall use GFRP bars; or the longitudinal reinforcement of the concealed column uses steel bars and the longitudinal distribution bars on both sides of the wall use CFRP bars and the longitudinal distribution bars in the middle of the wall use GFRP bars; or the longitudinal reinforcement of the concealed column uses CFRP bars, the longitudinal distribution bars on both sides of the wall use CFRP bars and the longitudinal distribution bars in the middle of the wall use GFRP bars. This reinforcement method is conducive to the full utilization of the high tensile strength of FRP bars.

[0011] The replaceable connecting beam includes non-replaceable sections at both ends and a replaceable section in the middle. The non-replaceable sections at both ends are concrete connecting beam sections, and the replaceable section in the middle is an energy-dissipating I-beam section. The non-replaceable sections at both ends and the replaceable section in the middle are connected by end plates using high-strength bolts and shear keys. A gap is provided between the upper floor slab and the connecting beam, and a non-connection treatment is used to reduce damage to the floor slab.

[0012] The replaceable wall base is equipped with a pre-embedded steel plate;

[0013] The replaceable wall base is equipped with a novel friction energy dissipator, which includes a sliding sub-plate, a sliding main plate, a connecting plate, an upper support plate, a lower support plate, friction plates, and a steel-concrete composite pipe. The sliding main plate has a vertical elongated hole, and the sliding sub-plate has bolt holes. The sliding main plate, the sliding sub-plate, and the steel-concrete composite pipe are connected by high-strength bolts. The sliding main plate is welded to the upper support plate. The sliding sub-plate, the connecting plate, and the steel-concrete composite pipe are connected by high-strength bolts. The connecting plate, the steel-concrete composite pipe, and the lower support plate are welded to the lower support plate. The upper support plate is embedded in the shear wall, and the lower support plate is connected to the pre-embedded steel plate at the lower part of the replaceable wall base by high-strength bolts. Friction plates are placed between the sliding main plate and the sliding sub-plate, and between the sliding main plate and the steel-concrete composite pipe.

[0014] The wall-foot friction energy dissipator utilizes the tensile force of friction between the sliding main plate and the friction plate, and the compressive force of friction between the steel pipe concrete;

[0015] The wall limb has a built-in steel truss at the bottom, which is located in the middle of the wall and is higher than the height of the replaceable area. The vertical members on the left and right sides of the built-in steel truss are welded to the support plate of the new friction energy dissipator at the replaceable wall foot.

[0016] This type of recoverable FRP hybrid reinforced coupled shear wall with replaceable base members and replaceable coupling beams utilizes high-strength CFRP and GFRP reinforcement to provide self-resetting capability, and I-beam segments and friction energy dissipators to dissipate energy. The built-in steel truss added to the bottom area of ​​the wall not only prevents damage to the non-replaceable parts, but also compensates for the reduced lateral stiffness and shear capacity caused by the weakening of the replaceable area. Because the FRP reinforcement remains in the elastic stage during an earthquake, the overall residual performance of the wall is good, and the damage and energy dissipation of the shear wall will be concentrated in the I-beam segments and friction energy dissipators. Attached Figure Description

[0017] Figure 1 This is a schematic diagram of the overall structure of the present invention.

[0018] Figure 2 This is a schematic diagram of the shear wall limb structure of the present invention.

[0019] Figure 3 This is a schematic diagram of the reinforcement of the shear wall section of the present invention.

[0020] Figure 4 This is a schematic diagram of the steel truss built into the shear wall limb of the present invention.

[0021] Figure 5 This is a schematic diagram of the replaceable connecting beam component of the present invention.

[0022] Figure 6 This is a cross-sectional view of the replaceable connecting beam component AA of the present invention.

[0023] Figure 7This is a cross-sectional view of the replaceable connecting beam component BB of the present invention.

[0024] Figure 8 This is a schematic diagram of the pre-embedded parts for the replaceable connecting beam component of the present invention.

[0025] Figure 9 This is a front elevation view of the novel friction energy dissipator with replaceable wall base according to the present invention.

[0026] Figure 10 This is a side view of the novel friction energy dissipator with replaceable wall base according to the present invention.

[0027] Figure 11 This is a schematic diagram of the sliding main board of the novel friction energy dissipator with replaceable wall base according to the present invention.

[0028] Figure 12 This is a top view of the novel friction energy dissipator with replaceable wall base according to the present invention. Detailed Implementation

[0029] The present invention will be further described below with reference to the accompanying drawings and specific embodiments:

[0030] A reversible functional FRP hybrid reinforced coupled shear wall with replaceable wall base members and replaceable coupling beam members, including wall limb 1, replaceable coupling beam 2, replaceable wall base 3, floor slab 4, and lower restraint beam 5;

[0031] The longitudinal reinforcement of the wall segment 1 adopts a mixed reinforcement form of CFRP, GFRP and steel bars, that is, the longitudinal reinforcement 7 of the concealed column uses CFRP bars and the longitudinal distribution bars 8 and 9 of the wall body use GFRP bars, or the longitudinal reinforcement 7 of the concealed column uses steel bars, the longitudinal distribution bars 8 on both sides of the wall body use CFRP bars and the longitudinal distribution bars 9 in the middle of the wall body use GFRP bars, or the longitudinal reinforcement 7 of the concealed column uses CFRP bars, the longitudinal distribution bars 8 on both sides of the wall body use CFRP bars and the longitudinal distribution bars 9 in the middle of the wall body use GFRP bars;

[0032] The bottom of the wall segment 1 is provided with an internal steel truss 6, and shear-resistant steel bars 12 are welded on the internal steel truss 6;

[0033] The replaceable connecting beam 2 includes a non-replaceable concrete connecting beam section 14 and a replaceable energy-dissipating I-beam section 13; a gap is provided between the replaceable connecting beam 2 and the upper floor slab 4 of the connecting beam to weaken the connection between the connecting beam and the floor slab.

[0034] The replaceable energy-dissipating I-beam segment 13 includes an upper flange plate 23, a web plate 24, a lower flange plate 25, and a stiffening plate 26; the replaceable energy-dissipating I-beam segment 13 is connected to the non-replaceable concrete connecting beam segment 14 through end plates 16 and 17, and a triangular steel plate 15 is provided at the connection; the end plates 16 and 17 are connected by high-strength bolts 18 and shear keys 19.

[0035] The replaceable I-beam segment's upper flange plate 23, web plate 24, and lower flange plate 25 are made of low-yield steel.

[0036] The non-replaceable concrete connecting beam section 14 is provided with a built-in embedded part 20, and the embedded part 20 is provided with a stiffening plate 21 and a stud 22; the built-in embedded part 20 is welded to the end plate 17; the longitudinal reinforcing steel bars in the non-replaceable concrete connecting beam section 14 are welded to the end plate 17.

[0037] The replaceable wall base 3 is equipped with a friction energy dissipator comprising two sliding sub-plates 31, two sliding main plates 30, two connecting plates 32, an upper support steel plate 27, a lower support steel plate 28, four friction plates 36, and a steel pipe concrete 37. The sliding main plate 30 has a vertical elongated hole, and the sliding sub-plates 31 and the steel pipe concrete 37 have bolt holes. The sliding main plates 30, the steel pipe concrete 37, and the sliding sub-plates 31 are connected by high-strength bolts 33. The sliding main plate 30 is welded to the upper support steel plate 27. The sliding sub-plates 31, the connecting plates 32, and the steel pipe concrete 37 are connected by high-strength bolts 34. The connecting plates 32 and the steel pipe concrete 37 are welded to the lower support steel plate 28. Friction plates 36 are placed between the sliding main plate 20 and the sliding sub-plate 19, and between the sliding main plate 20 and the steel pipe concrete 37.

[0038] A gap is provided between the upper part of the steel-concrete composite tube 37 and the upper support steel plate 27; the bolt hole diameter of the steel-concrete composite tube 37 is larger than the outer diameter of the high-strength bolts 33 and 34, so that there is no contact between the steel-concrete composite tube and the high-strength bolts 33 and 34.

[0039] The wall segment 1 has a notch in the replaceable part at the base of the wall, and a pre-embedded steel plate 29 is provided at the lower part of the notch, which is connected to the lower support steel plate 28 of the friction energy dissipator by high-strength bolts 35.

[0040] Step 1: Precast steel truss 6 built into the wall body; precast friction energy dissipator 3; precast replaceable I-beam segment 13 and embedded parts 20.

[0041] Step 2: Tie the steel cage of the lower restraint beam 5, place the embedded steel plate 29 at the wall foot position corresponding to the lower restraint beam 5, weld the embedded steel plate 29 to the steel reinforcement of the lower restraint beam, and fix the friction energy dissipator 3 to the embedded steel plate 29 with high-strength bolts 35.

[0042] Step 3: Tie the steel reinforcement cage of wall segment 1 and replaceable connecting beam 2, and insert the built-in steel truss 6 into the steel reinforcement cage of wall segment 1; weld the vertical bars on the left and right sides of the built-in steel truss 6 to the upper support steel plate 27 of the friction energy dissipator; weld the longitudinal reinforcing bar 7 of the hidden column to the upper support steel plate 27 of the friction energy dissipator; install and position the replaceable I-beam segment 13 and the embedded part 20.

[0043] Step 4: Hoist the entire steel cage into the formwork and pour concrete. After the cast-in-place concrete has cured, the fabrication of the reversible FRP hybrid reinforced coupled shear wall with replaceable wall base components and replaceable coupling beam components is completed.

Claims

1. A recoverable functional FRP hybrid reinforced coupled shear wall with replaceable wall base members and replaceable coupling beam members, characterized in that, Includes FRP hybrid reinforced wall segments, built-in steel trusses in the wall, replaceable connecting beams, replaceable new friction energy dissipators, floor slabs, and lower restraint beams; Among them, the longitudinal reinforcement of the FRP mixed reinforcement wall segment adopts a mixture of CFRP bars, GFRP bars and steel bars, and the horizontal reinforcement adopts steel bars. The reversible FRP hybrid reinforced coupled shear wall has a built-in steel truss in the bottom area of ​​the wall to prevent local stress concentration near the embedded parts from causing damage to the non-replaceable parts, while also compensating for the reduced lateral stiffness and shear capacity of the structure due to the weakening of the replaceable area. A new type of friction energy dissipator can be replaced to replace the easily damaged reinforced concrete area at the foot of the shear wall, and the damage and energy consumption of the shear wall will be concentrated on the friction energy dissipator.

2. The recoverable functional FRP hybrid reinforced coupled shear wall with replaceable wall base members and replaceable coupling beam members according to claim 1, characterized in that, The replaceable wall base component is equipped with a new type of friction energy dissipator, which includes a sliding sub-plate, a sliding main plate, a connecting plate, an upper support plate, a lower support plate, a friction plate, and a steel pipe concrete. The new type of friction energy dissipator utilizes the friction between the sliding main plate and the friction plate to generate tension, and utilizes the friction between the steel pipe concrete to generate pressure.

3. The recoverable functional FRP hybrid reinforced coupled shear wall with replaceable wall base members and replaceable coupling beam members according to claim 2, characterized in that, The novel friction energy dissipator has a vertically elongated hole in its sliding main plate. The sliding main plate, sliding auxiliary plate, and steel-concrete composite pipe are connected by high-strength bolts. The sliding auxiliary plate, connecting plate, and steel-concrete composite pipe are connected by high-strength bolts. The sliding main plate is welded to the upper support plate, and the connecting plate, steel-concrete composite pipe, and lower support plate are welded to the lower support plate. The upper support plate is embedded in the shear wall, and the lower support plate is connected to the pre-embedded steel plate at the base of the replaceable wall wall by high-strength bolts. Friction pads are placed between the sliding main plate and the sliding auxiliary plate, and between the sliding main plate and the steel-concrete composite pipe. The bolt holes in the steel-concrete composite pipe have a diameter larger than the outer diameter of the high-strength bolt, so that there is no contact between the steel-concrete composite pipe and the high-strength bolt. A gap is provided between the upper part of the steel-concrete composite pipe and the upper support steel plate. Only when the vertical displacement value of the upper support steel plate reaches the gap value does the steel-concrete composite pipe begin to bear the vertical pressure transmitted from the upper support steel plate.

4. The recoverable functional FRP hybrid reinforced coupled shear wall with replaceable wall base members and replaceable coupling beam members according to claim 1, characterized in that, The bottom of the wall limb has a built-in steel truss, which is located in the middle of the wall and is higher than the height of the replaceable area. The vertical rods on the left and right sides of the steel truss are welded to the support plate of the new friction energy dissipator at the foot of the replaceable wall. Shear-resistant steel bars are welded on the steel truss.

5. The recoverable functional FRP hybrid reinforced coupled shear wall with replaceable wall base members and replaceable coupling beam members according to claim 1, characterized in that, There are three types of longitudinal reinforcing bars for the wall limbs: wall limb GFRP bars - concealed column CFRP bars, wall limb middle section GFRP bars - wall limb middle section CFRP bars on both sides - concealed column reinforcing bars, and wall limb middle section GFRP bars - wall limb middle section CFRP bars on both sides - concealed column CFRP bars.

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