Function-recoverable wall and modeling method thereof
By designing functional recovery walls in the building structure, using the self-reset friction energy consumption device to provide post-seismic friction energy consumption and self-reset capability, it solves the problem that buildings are difficult to quickly recover their functions after earthquakes, and achieves efficient recovery of the structure and improves seismic performance.
Patent Information
- Application Number
- CN202510062012.5
- Authority / Receiving Office
- CN · China
- Patent Type
- Applications(China)
- Current Assignee / Owner
- Filing Date
- 2025-01-15
- Publication Date
- 2025-05-13
AI Technical Summary
It is difficult for existing building structures to quickly restore their original functions after earthquakes, resulting in large residual deformation, high repair costs, and complex structure of the self-resetting device and difficult construction.
The design of the wall that can recover functions includes hinged support walls, self-reset friction energy consumption devices, gravity columns and bottom beams. The post-shock friction energy consumption and self-reset capability are provided through the self-reset friction energy consumption device to reduce residual displacement.
The post-seismic functional recovery of reinforced concrete structures is achieved, which reduces the damage to the building by earthquakes, reduces the difficulty and cost of repairs, and improves the seismic redundancy.
Smart Images
Figure CN119981305A_ABST
Abstract
Description
Technical Field
[0001] The invention belongs to the technical field of building structures, and in particular relates to a functionally restorable wall and a modeling method thereof. Background Art
[0002] How to maintain and restore the original building functions after a set level of earthquake, that is, how to maintain the seismic resilience of the building, has become an important task in the current scientific discovery and key technological innovation in the field of earthquake engineering. The research and application of buildings with good seismic resilience is one of the important directions for the development of my country's construction industry.
[0003] The earthquake-resistant technology with recoverable function refers to the technology that fully considers the rapid recovery of the use function of the structure after the earthquake at the beginning of the design. The recoverable function structure can quickly restore its use function by quickly replacing or reinforcing the damaged parts after the earthquake by reasonably designing the concentrated damage parts. The recoverable function structure usually has good seismic toughness. It not only has seismic safety, but also has self-reset ability, so that the building structure has a small residual deformation after the earthquake, which is conducive to the repair of the building structure. The reasonable design of seismic isolation and shock absorption means can help improve the post-earthquake recoverability of the building. The more general concept is to achieve high ductility and replaceable functions in some vulnerable parts of the structure. The three structural forms of conventional recoverable function structures currently studied are replaceable component structure, swing structure and self-reset structure. This topic is mainly aimed at recoverable function shear wall structure, specifically, including replaceable component shear wall structure, swing shear wall structure and self-reset shear wall structure. Through refined design, systematic analysis, and a complete component system, it is expected to achieve high ductility and replaceability of vulnerable parts of recoverable function shear wall structure in future development.
[0004] At present, the evaluation of seismic toughness requires refined structural response indicators, and residual displacement can be used as an important parameter for earthquake loss assessment and toughness evaluation. Earthquake damage surveys show that structures often produce significant residual displacements after entering nonlinearity under earthquake action. The residual deformation of the structure after an earthquake directly affects whether the structure needs to be reinforced after an earthquake and the cost of reinforcement. Self-reset capacity refers to the ability of the structure to return to its initial position after an earthquake, and is one of the key factors in achieving the recoverable function of a structure. The measures currently adopted are: (i) From the structural construction level, change the structural system, such as setting post-tensioning unbonded prestressing to provide self-recovery force. (ii) Starting from the building materials themselves, set superelastic materials, such as shape memory alloy materials. (iii) Set a self-reset device in the structure, such as a disc spring self-reset device. The existing structure to achieve the self-reset capacity is relatively complex, and the engineering construction is also difficult. It is necessary to develop a self-reset device and structural system with simple construction process and simple structure. Summary of the invention
[0005] Purpose of the invention: One purpose of the present invention is to provide a functionally restorable wall to improve the post-earthquake functional restorability of reinforced concrete structures and reduce the impact of earthquake disasters on normal life and production.
[0006] Another object of the present invention is to provide a modeling method for the functionally restorable wall.
[0007] Technical solution: The functional restorable wall described in the present invention includes: a hinged wall, a self-resetting friction energy dissipation device, a gravity column and a bottom beam. The bottom of the hinged wall is hinged to the bottom beam, the gravity column is arranged on both sides of the hinged wall and is connected through multiple groups of self-resetting friction energy dissipation devices, the bottom of the gravity column is hinged to the bottom beam, and the self-resetting friction energy dissipation device adopts a graded friction structure to achieve smooth conversion between static and dynamic friction, providing post-earthquake friction energy dissipation and self-resetting capabilities.
[0008] Optionally, the self-resetting friction energy dissipation device includes an inner plate, an outer plate, a disc spring and a fixing part. Two inner plates are provided, and a gap is provided between the two inner plates. The outer plate is provided on the upper and lower surfaces of the two inner plates, and the contact surfaces between the inner plate and the outer plate are respectively provided with mutually fitting convex keys and grooves. The disc spring is provided on the outer side surface of the outer plate, and the inner plate, the outer plate and the disc spring are fixed by the fixing part.
[0009] Optionally, the inner plate key and the outer plate groove are respectively provided with two-stage folding surfaces that fit each other, and the angles between the two-stage folding surfaces and the horizontal plane are θ1 and θ2 respectively, wherein the plane with an angle of θ1 with the horizontal plane is the first friction surface, and the plane with an angle of θ2 with the horizontal plane is the second friction surface.
[0010] Optionally, the friction relationship between the convex key and the groove is divided into three stages: no sliding, sliding stage one and sliding stage two;
[0011] The sliding friction force F of the self-resetting friction energy dissipation device in the second sliding stage slip The expression is:
[0012]
[0013] Among them, μ s is the sliding friction coefficient between the inner plate convex key and the outer plate groove of the self-resetting friction energy dissipation device, n is the number of bolts on the inner plate of the self-resetting friction energy dissipation device, F b,pr Preload the disc spring;
[0014] Static friction force F of the self-resetting friction energy dissipation device in the sliding stage k The expression is:
[0015]
[0016] Among them, μ kis the static friction coefficient of the self-resetting friction energy dissipation device;
[0017] Let the static friction force in sliding stage one be equal to the sliding friction force in sliding stage two:
[0018] F slip =F k
[0019] The relationship between θ1 and θ2 can be obtained. When the static friction coefficient μ k Greater than the sliding friction coefficient μ s When the cam angle θ is changed from θ1 to θ2, a smooth transition between static and dynamic friction is achieved.
[0020] Optionally, the inner plates at both ends of the self-resetting friction energy dissipation device are respectively connected to the gravity column and the RC wall panel by connecting rods.
[0021] Optionally, multiple inner plate convex keys and outer plate grooves are provided, and the fixing position of the fixing part is located within the range of the inner plate convex keys and the outer plate grooves.
[0022] Optionally, the fixing portion is a bolt.
[0023] Optionally, the hinged wall includes a V-shaped support, an RC wall panel and a connecting beam, the upper portion of the connecting beam is fixedly connected to the bottom of the RC wall panel, and the lower portion of the connecting beam is combined with the V-shaped support to form an elastic wall bottom with strong elastic deformation capability.
[0024] The function can restore the wall modeling method, including:
[0025] OpenSees software was used to establish a functional recoverable wall calculation model; the self-resetting friction energy dissipation device was simulated using horizontal and vertical zero-length units, the mechanical model of the horizontal zero-length unit was simulated using rigid materials, and the mechanical model of the vertical zero-length unit was a flag-shaped mechanical model, and its constitutive structure was simulated using self-resetting materials; the gravity column was simulated using beam-column units; the RC wall panel was simulated using nonlinear shell units; and the V-shaped support and connecting beam were simulated using rigid body units.
[0026] Furthermore, the gravity column is simulated by beam-column unit, whose cross section is a fiber cross section, the steel bars and concrete are set at their corresponding positions, and the materials are set as the corresponding mechanical characteristic parameters of the steel bars and concrete; the RC wall panel is simulated by nonlinear shell unit, and its material properties are defined as the corresponding mechanical characteristic parameters of the concrete and steel bars.
[0027] Beneficial effects: Compared with the prior art, the present invention has the following significant technical effects: (1) the self-resetting friction energy dissipation device provides the functionally restorable wall with self-resetting capability, and the residual displacement of the functionally restorable wall after an earthquake is small; (2) the self-resetting friction energy dissipation device provides energy dissipation capability, thereby improving the energy dissipation capability of the functionally restorable wall; (3) the vertical axial force and horizontal shear force are mainly transmitted by the gravity column, the RC wall panel and the V-shaped support at the bottom of the connecting beam, and the bending moment is transmitted through the bending moment couple formed by the self-resetting friction energy dissipation device between the RC wall panel and the gravity column, thereby realizing the bending and shear separation of the functionally restorable wall; (4) the damage to the functionally restorable wall after an earthquake is small, and no or less repair is required; (5) the functionally restorable wall has the characteristics of dispersed energy dissipation and multi-point self-reset, which reduces the pre-pressure requirement of a single self-resetting friction energy dissipation device in the wall, and has high seismic redundancy. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] Figure 1 This is a schematic diagram of a functionally recoverable wall structure;
[0029] Figure 2 Schematic diagram of hinged wall structure;
[0030] Figure 3 Schematic diagram of the structure of the self-resetting friction energy dissipation device, wherein (a) is a schematic diagram of the overall structure, and (b) is a schematic diagram of the local structure of the protrusions and grooves;
[0031] Figure 4 Schematic diagram of the self-resetting friction energy dissipation device under different stress conditions, where (a) is the stress conditions at different stages, and (b) is the displacement conditions of the protrusion and groove at different stages;
[0032] Figure 5 The force analysis diagram of the self-resetting friction energy dissipation device, wherein (a) is a schematic diagram of the force analysis of the sliding stage 1, and (b) is a schematic diagram of the force analysis of the sliding stage 2;
[0033] Figure 6 Computational model for a functionally recoverable wall. DETAILED DESCRIPTION
[0034] The present invention is described in detail below with reference to the accompanying drawings and specific embodiments.
[0035] like Figure 1As shown, the functional restorable wall of the present invention comprises: a V-shaped support 1, an upper RC wall panel 2, a connecting beam 3, a bottom beam 4, a gravity column 6, a self-resetting friction energy dissipation device 7 and a connecting rod 8. The V-shaped support 1 is connected with the upper RC wall panel 2 of the functional restorable wall by a connecting beam 3 to bear and transmit the internal force of the wall. The upper part of the connecting beam 3 is provided with bolts to improve the bonding force between the connecting beam 3 and the upper RC wall panel 3. The lower part of the V-shaped support 1 is hingedly connected to the bottom beam 4. The connecting beam 3 and the V-shaped support 1 are combined to form an elastic wall bottom with strong elastic deformation ability. The connecting beam 3, the V-shaped support 1 and the upper RC wall panel together form a hinged wall 5 (see Figure 2 ). A gravity column 6 is arranged outside the hinged wall 5, and the bottom of the gravity column 6 is hingedly connected to the bottom beam 4. The gravity column 6 is connected to the hinged wall 5 through multiple sets of self-resetting friction energy dissipation devices 7. The self-resetting friction energy dissipation devices 7 can be adjusted according to design requirements (the specific adjustment parameters can refer to formulas (1), (2) and (3) to adjust their bearing capacity). The self-resetting friction energy dissipation devices 7 provide friction energy dissipation and self-resetting capabilities. The inner plates 71 at both ends of the self-resetting friction energy dissipation device 7 are respectively connected to the gravity column 6 and the upper RC wall panel 2 using connecting rods 8.
[0036] like Figure 3 As shown in (a) and (b), the self-resetting friction energy dissipation device 7 is composed of an inner plate 71, an outer plate 72, a convex key 73, a groove 74, a disc spring 75, and a bolt 76. The self-resetting friction energy dissipation device 7 uses the inner plate 71, the outer plate 72, and the disc spring 73 as the main force-bearing components. The inner plate 71 and the outer plate 72 are provided with a convex key 73 and a groove 74 that fit each other, and are provided with a through bolt hole. Two inner plates 71 are provided, and a gap is provided between the two inner plates 71. The disc spring 73 is provided on the outside of the outer plate 72, and the inner plate 71, the outer plate 72 and the disc spring 75 are connected by bolts 76. The self-resetting friction energy dissipation device 7 has the characteristics of high bearing capacity, small residual deformation, and flexible stiffness adjustment.
[0037] The number of the convex key 73 and the concave groove 74 is designed according to the specific stress conditions. Specifically, the size and number of the convex key 73 and the concave groove 74 should ensure that they are elastic under the maximum deformation condition of the self-resetting friction energy dissipation device. The disc spring 75 is located on the outside of the outer plate 72, and the bolt 76 is located within the range of the inner plate 71 and the outer plate 72 involved by the convex key 73 and the concave groove 74.
[0038] like Figure 3 As shown in (a) and (b), the hierarchical friction structure of the self-resetting friction energy dissipation device is specifically embodied as follows: the inner plate convex key 73 and the outer plate groove 74 are respectively provided with two-stage folding surfaces, and the angles between the two-stage folding surfaces and the horizontal plane are θ1 and θ2 respectively, wherein the plane with an angle of θ1 with the horizontal plane is the first friction surface, and the plane with an angle of θ2 with the horizontal plane is the second friction surface. The friction relationship between the convex key 73 and the groove 74 is as follows: Figure 4As shown in (a) and (b), there are three stages: (1) No sliding, there is no sliding between the inner plate convex key 73 and the outer plate groove 74, the first friction surface of the outer plate groove 74 is in direct contact with the first friction surface of the inner plate convex key 73, and the second friction surface of the outer plate groove 74 is at a certain distance from the second friction surface of the inner plate convex key 73. (2) Sliding stage 1, the inner plate convex key 73 and the outer plate groove 74 slide in the θ1 angle area, the first friction surface on one side of the outer plate groove 74 is in direct contact with the first friction surface of the inner plate convex key 73 on the same side, and there is a certain distance on the other side; the distance between the second friction surface on one side of the outer plate groove 74 and the second friction surface of the inner plate convex key 73 on the same side gradually decreases, and the distance on the other side gradually increases. (3) Sliding stage 2, the inner plate convex key 73 and the outer plate groove 74 slide in the θ2 angle area, the first friction surface of the outer plate groove 74 is separated from the first friction surface of the inner plate convex key 73, the second friction surface of the outer plate groove 74 is in direct contact with the second friction surface of the inner plate convex key 73, and the distance is zero. Static friction force F in sliding stage 1 k Sliding friction force F in sliding stage 2 slip The range of the θ1 angle zone is usually small. When the self-resetting friction energy dissipation device 7 reaches the static friction force of the θ1 angle zone, it immediately enters the θ2 angle zone to achieve a smooth conversion of static and dynamic friction.
[0039] Depend on Figure 5 From the force analysis of the self-resetting friction energy dissipation device in (b), it can be seen that the sliding friction force F of the self-resetting friction energy dissipation device in the sliding stage 2 is slip The expression is:
[0040]
[0041] Among them, μ s is the sliding friction coefficient between the inner plate convex key and the outer plate groove of the self-resetting friction energy dissipation device, n is the number of bolts on a single inner plate of the self-resetting friction energy dissipation device, F b,pr Preload the disc spring. Figure 5 Medium, F f is the interface axial force, F τ is the interface friction)
[0042] Depend on Figure 5 The static friction force F of the self-resetting friction energy dissipation device in (a) during the sliding stage k The expression is:
[0043]
[0044] Among them, μ k It is the static friction coefficient of the self-resetting friction energy dissipation device.
[0045] Let the static friction force in sliding stage one be equal to the sliding friction force in sliding stage two:
[0046] F slip =F k (3)
[0047] The relationship between θ1 and θ2 can be obtained. When the static friction coefficient μ k Greater than the sliding friction coefficient μ s When the cam angle θ is changed from θ1 to θ2, a smooth transition between static and dynamic friction is achieved.
[0048] The stress mechanism of the functional restorable wall: Under small and large earthquakes, the connecting beams and V-shaped supports of the functional restorable wall are in an elastic state, and their deformation is small; the reason is that the lower part of the V-shaped support 1 is hingedly connected to the bottom beam 4 and the bottom of the gravity column 6 is hingedly connected to the bottom beam 4, which leads to the rotation displacement of the bottom of the wall. Of course, the connecting beam and the V-shaped support themselves also need to have sufficient bearing capacity. Under small earthquakes, the self-resetting friction energy dissipation device in the functional restorable wall is not activated, and the RC wall panel is in an elastic state. Under medium and large earthquakes, the self-resetting friction energy dissipation device in the functional restorable wall is activated, resulting in a decrease in the lateral stiffness of the functional restorable wall and entering the post-yield stage. However, at this time, the rotation displacement of the bottom of the wall (because the lower part of the V-shaped support 1 is hingedly connected to the bottom beam 4 and the bottom of the gravity column 6 is hingedly connected to the bottom beam 4) increases, while the increase in the internal force of the wall is small, and the RC wall panel of the functional restorable wall is still in an approximately elastic state. After the load disappears, the functional restorable wall is self-reset under the restoring force of the self-resetting friction energy dissipation device, and the residual displacement is small. After being activated, the self-resetting friction energy dissipation device can realize friction energy dissipation and self-reset at the same time, providing the function of restoring the energy dissipation capacity and self-reset capacity of the wall.
[0049] The force mechanism of the self-resetting friction energy dissipation device: When the axial force of the self-resetting friction energy dissipation device is zero, the disc spring is in a pre-compression state and has pre-pressure on the inner plate and the outer plate. When the axial force of the self-resetting friction energy dissipation device is less than or equal to the static friction force of the sliding stage one, the inner plate and the outer plate remain stationary. When the axial force of the self-resetting friction energy dissipation device is greater than the static friction force of the sliding stage one, the self-resetting friction energy dissipation device is activated, the disc spring begins to be further compressed, and the inner plate convex key and the outer plate groove begin to slide displacedly, and the two slide on the first friction surface. As the axial force of the self-resetting friction energy dissipation device further increases, the self-resetting friction energy dissipation device switches from sliding stage one to sliding stage two, and the two slide on the second friction surface. When the axial force is unloaded, due to the pressure of the disc spring, the inner plate and the outer plate of the self-resetting friction energy dissipation device return to their initial positions, and the force of the self-resetting friction energy dissipation device is unloaded from its maximum force to the residual force.
[0050] The proposed defense objectives of the functionally recoverable wall are: no damage in small earthquakes, and the self-resetting friction energy dissipation device is not activated; under moderate and large earthquakes, the self-resetting friction energy dissipation device is activated to provide sufficient energy dissipation and recovery force.
[0051] The modeling method of a functionally restorable wall structure of the present invention comprises the following steps: using OpenSees software to establish a computational model of a functionally restorable wall, the schematic diagram of the model is shown in FIG. Figure 6 As shown. The self-resetting friction energy dissipation device is simulated by horizontal and vertical zero-length units. The mechanical model of the horizontal zero-length unit is simulated by rigid materials. The mechanical model of the vertical zero-length unit is a flag-shaped mechanical model, and its constitutive structure is simulated by self-resetting materials. The gravity column is simulated by beam-column units, and its cross section is a fiber cross section. The steel bars and concrete are set at their respective positions, and the materials are set to the corresponding mechanical characteristic parameters of the steel bars and concrete. The concrete wall (i.e., RC wall panel) is simulated by nonlinear shell units, and its material properties are defined as the corresponding mechanical characteristic parameters of the corresponding concrete and steel bars; the V-shaped support and connecting beam are simulated by rigid body units, and their materials are rigid materials.
[0052] The functionally restorable wall described in the present invention utilizes the restoring ability of a self-resetting energy-absorbing friction device to realize the self-resetting and energy-absorbing of the wall, thus overcoming the technical difficulties of the existing self-resetting structure of restorable functional concrete shear walls, which are complex and difficult to construct. This allows other components of the reinforced concrete shear wall structure to be undamaged or minimally damaged, thereby reducing the difficulty of post-earthquake repair of the reinforced concrete shear wall structure, improving the post-earthquake functional recoverability of the reinforced concrete structure, and reducing the impact of earthquake disasters on normal life and production.
Claims
1. A functional restorable wall, characterized in that: include: A hinged wall (5), a self-resetting friction energy dissipation device (7), a gravity column (6) and a bottom beam (4); the bottom of the hinged wall (5) is hinged to the bottom beam (4); the gravity column (6) is arranged on both sides of the hinged wall (5) and is connected through a plurality of groups of self-resetting friction energy dissipation devices (7); the bottom of the gravity column (6) is hinged to the bottom beam (4); the self-resetting friction energy dissipation device (7) adopts a graded friction structure to achieve smooth conversion between static and dynamic friction, and provide post-earthquake friction energy dissipation and self-resetting capabilities.
2. The functional restorable wall according to claim 1, characterized in that: The self-resetting friction energy dissipation device (7) comprises an inner plate (71), an outer plate (72), a disc spring (75) and a fixing part. Two inner plates (71) are provided, and a gap is provided between the two inner plates (71). The outer plate (72) is provided on the upper and lower surfaces of the two inner plates (71), and mutually fitting convex keys (73) and grooves (74) are provided on the contact surfaces of the inner plate (71) and the outer plate (72). The disc spring (75) is provided on the outer side surface of the outer plate. The inner plate (71), the outer plate (72) and the disc spring (75) are fixed by the fixing part.
3. The functional restorable wall according to claim 2, characterized in that: The inner plate convex key (73) and the outer plate groove (74) are respectively provided with two-stage folding surfaces that fit each other, and the angles between the two-stage folding surfaces and the horizontal plane are θ1 and θ2 respectively, wherein the plane with the angle θ1 with the horizontal plane is the first friction surface, and the plane with the angle θ2 with the horizontal plane is the second friction surface.
4. The functional restorable wall according to claim 3, characterized in that: The friction relationship between the convex key (73) and the groove (74) is divided into three stages: no sliding, sliding stage one and sliding stage two; The sliding friction force F of the self-resetting friction energy dissipation device in the second sliding stage slip The expression is: Among them, μ s is the sliding friction coefficient between the inner plate convex key and the outer plate groove of the self-resetting friction energy dissipation device, n is the number of bolts on the inner plate of the self-resetting friction energy dissipation device, F b,pr Preload the disc spring; Static friction force F of the self-resetting friction energy dissipation device in the sliding stage k The expression is: Among them, μ k is the static friction coefficient of the self-resetting friction energy dissipation device; Let the static friction force in sliding stage one be equal to the sliding friction force in sliding stage two: F slip =F k The relationship between θ1 and θ2 can be obtained. When the static friction coefficient μ k Greater than the sliding friction coefficient μ s When the cam angle θ is changed from θ1 to θ2, a smooth transition between static and dynamic friction is achieved.
5. The functional restorable wall according to claim 2, characterized in that: The inner plates (71) at both ends of the self-resetting friction energy dissipation device (7) are respectively connected to the gravity column (6) and the RC wall panel (2) by means of connecting rods (8).
6. The functional restorable wall according to claim 2, characterized in that: A plurality of inner plate convex keys (73) and outer plate concave grooves (74) are provided, and the fixing position of the fixing part is located within the range of the inner plate convex keys (73) and the outer plate concave grooves (74).
7. The functional restorable wall according to claim 2, characterized in that: The fixing portion is a bolt.
8. The functional restorable wall according to claim 1, characterized in that: The hinged wall (5) comprises a V-shaped support (1), an RC wall panel (2) and a connecting beam (3); the upper portion of the connecting beam (3) is fixedly connected to the bottom of the RC wall panel (2); the lower portion of the connecting beam (3) is combined with the V-shaped support (1) to form an elastic wall bottom with strong elastic deformation capability.
9. A method for modeling a functionally restorable wall according to any one of claims 1 to 8, characterized in that: include: OpenSees software was used to establish a functional recoverable wall calculation model; the self-resetting friction energy dissipation device was simulated using horizontal and vertical zero-length units, the mechanical model of the horizontal zero-length unit was simulated using rigid materials, and the mechanical model of the vertical zero-length unit was a flag-shaped mechanical model, and its constitutive structure was simulated using self-resetting materials; the gravity column was simulated using beam-column units; the RC wall panel was simulated using nonlinear shell units; and the V-shaped support and connecting beam were simulated using rigid body units.
10. The modeling method according to claim 9, characterized in that: The gravity column is simulated by beam-column unit, whose cross section is fiber cross section, steel bars and concrete are set at their corresponding positions, and the material is set as the corresponding mechanical characteristic parameters of steel bars and concrete; the RC wall panel is simulated by nonlinear shell unit, and its material properties are defined as the corresponding mechanical characteristic parameters of concrete and steel bars.