A negative poisson's ratio composite steel plate shear wall
By introducing negative Poisson's ratio components and concave honeycomb sandwich layers into steel plate shear walls, the design of steel plate shear wall structures is optimized, solving the problem of mismatch between seismic and blast resistance performance, and achieving overall coordination of performance and improved energy absorption capacity in multi-hazard environments.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Patents(China)
- Current Assignee / Owner
- TONGJI UNIV
- Filing Date
- 2023-09-27
- Publication Date
- 2026-06-23
Smart Images
Figure CN117306743B_ABST
Abstract
Description
Technical Field
[0001] This invention belongs to the field of civil engineering, and specifically relates to a negative Poisson's ratio composite steel plate shear wall. Background Technology
[0002] my country is one of the countries most severely affected by disasters in the world, with economic losses caused by disasters consistently ranking among the highest globally. The increasing prominence of multiple disaster clusters and disaster chain characteristics poses a serious threat to the safe operation of civil engineering and infrastructure. Therefore, comprehensive disaster reduction across multiple disasters has become a major national strategic need and one of the current cutting-edge hot topics in the field of disaster prevention and mitigation in civil engineering. Among natural and man-made disasters, the two most representative extreme disasters are earthquakes and explosions. Under the action of earthquakes, secondary disasters such as flammable gas leaks, violent chemical reactions, and ignition of flammable and explosive materials are all important factors that induce explosions. After an earthquake, it can easily directly induce an explosion within a short period of time, forming a disaster chain and combining effects. Whether these two disasters act independently or in combination, they place high demands on the disaster resistance performance of engineering structures. Taking into account both the independent and combined effects of these two disasters is an essential requirement for multi-hazard engineering and an important guarantee for the safe operation of structures throughout their entire life cycle.
[0003] Developing high-performance engineering structural systems and key devices resistant to multiple disasters, and constructing an integrated design theory aimed at improving the resilience of engineering structures against multiple disasters, is an urgent task in the field of structural engineering. Currently, scholars and engineers in the field of structural engineering focus on the seismic and blast resistance of concrete and composite concrete structures, while research on the earthquake and blast resistance of steel structures, which are widely used, is still scarce.
[0004] As an important lateral force resisting structural system in the field of steel structures, the steel plate shear wall (SPSW) structural system has many advantages, such as good seismic performance, light structural weight, fast construction speed, and flexible structural layout. Under the general trend of developing high-performance steel structure systems for multiple disasters, steel plate shear walls serve as the first line of defense in structural systems, playing a crucial role in bearing and dissipating most of the input energy and controlling damage to the main structure. In the nearly 50-year development history of SPSW, researchers have focused primarily on its seismic performance; comparatively, research on its blast resistance has lagged behind. Therefore, considering the different effects and coupling effects of earthquakes and blasts, it is urgent to evaluate and improve the multi-hazard resistance performance of steel plate shear wall structures. Blast resistance is a weak point of SPSW; its blast resistance capacity is severely mismatched with its seismic capacity, and the performance requirements of earthquakes and blasts on SPSW are significantly different and even contradictory. Currently, there is a lack of SPSWs that can simultaneously possess superior seismic and blast resistance capabilities, making it difficult to coordinate the seismic and blast resistance performance requirements of SPSWs. At the same time, there are no reports on the nonlinear damage accumulation of steel under the coupled action of low-cycle cyclic loads and high strain rate loads. The adverse effects of seismic damage significantly increase the difficulty for SPSWs to meet blast resistance requirements, making it difficult to meet the performance requirements of SPSWs under the combined action of the two disasters.
[0005] Metamaterials are a new class of materials in the 21st century. Through artificial design of their physical structure, they possess unique properties and functions not found in natural materials. Negative Poisson's ratio is one such extraordinary material mechanical property; under tension, the material expands laterally, while under compression, it contracts laterally. Recent research on artificially designed negative Poisson's ratio materials / structures has revealed that they exhibit exceptional performance characteristics such as lightweight yet high strength, superior resistance to denting and fracture, and energy dissipation. Furthermore, it has been demonstrated that negative Poisson's ratio metamaterials / structures possess superior shear and blast resistance, showing great potential for application in the construction field. Summary of the Invention
[0006] The purpose of this invention is to provide a negative Poisson's ratio composite steel plate shear wall to solve at least one of the above-mentioned problems, thereby addressing the mismatch between the blast resistance and seismic resistance of existing steel plate shear walls. Based on the typical steel plate shear wall component, this invention optimizes and improves upon the design concept of negative Poisson's ratio metamaterials, providing a novel negative Poisson's ratio composite steel plate shear wall that achieves both seismic and blast resistance performance under SPSW (short-span shear wall) conditions, essentially realizing the goal of coordinating structural performance requirements under both types of disasters.
[0007] The objective of this invention is achieved through the following technical solution:
[0008] A negative Poisson's ratio composite steel plate shear wall includes negative Poisson's ratio members and edge members;
[0009] The negative Poisson's ratio component includes a core layer disposed in the middle and outer steel plates disposed on both sides of the core layer; the outer steel plates are connected to the edge component, the core layer is disposed inside the edge component, and the core layer is connected to the outer steel plates.
[0010] Both the outer steel plate and the sandwich layer have a negative Poisson's ratio configuration.
[0011] Preferably, the outer steel plate has orthogonally distributed perforations periodically.
[0012] Preferably, the perforation is elliptical.
[0013] Preferably, the sandwich layer has a concave honeycomb structure in the thickness direction.
[0014] Preferably, the outer steel plate is connected to the core layer by tie bolts. The surrounding restraint members are connected only to the added outer steel plate and not to the core layer, so that the tie bolts only restrict the out-of-plane displacement of the core layer.
[0015] Preferably, the sandwich layer is composed of several corrugated plates; the corrugated plates are concave in shape with the peaks facing each other, and the corrugated plates are connected by tie bolts to form the sandwich layer.
[0016] Preferably, the bolt holes on the sandwich layer for passing through the tie bolts are elongated elliptical.
[0017] Preferably, the outer steel plate is further provided with a pad at the bolt hole through which the tie bolt passes, and the pad is pressed between the outer steel plate and the tie bolt.
[0018] Preferably, the tie bolt is preloaded.
[0019] Preferably, the negative Poisson's ratio component is made of structural steel.
[0020] Generally, the shear modulus G of a material can be expressed by Poisson's ratio ν as: G = E / 2(1+ν), where E is the elastic modulus of the material. When the Poisson's ratio of a material is negative, it has a larger shear modulus than a material with a positive Poisson's ratio. In this invention, the negative Poisson's ratio member is discretized into a series of parallel oblique tension members and a diagonal compression member, used to simulate the tension band formed by the horizontal shear force acting on the buckled steel plate shear wall, and the pressure on the corner area of the steel plate wall, respectively. Under the action of axial tension, the cross-sectional direction of a conventional steel plate strip will contract; under the action of axial tension, the cross-sectional direction of a negative Poisson's ratio steel plate strip will extend outward. Under this special deformation mechanism of the negative Poisson's ratio steel plate, the pressure of the compression member at the other diagonal of the steel plate wall first needs to counteract the lateral expansion deformation of the steel plate wall strip, and then continue to apply force in the cross-sectional direction of the strip, causing the SPSW to buckle and fold. Meanwhile, the overall deformation mechanism of the negative Poisson's ratio metamaterial honeycomb sandwich layer allows the stress wave caused by the explosion shock wave to propagate over a wider range inside the structure; when subjected to impact load, the local pressure points will undergo lateral shrinkage deformation, showing a tendency to compact, and the density will increase instantaneously.
[0021] Compared with the prior art, the present invention has the following beneficial effects:
[0022] (1) Adding outer steel plates to the functional units shares the energy dissipation and vibration reduction function of the embedded steel plates, avoiding the core layer from prematurely bearing horizontal shear force and participating in hysteretic energy dissipation under seismic action, and giving full play to the superior performance of the outer steel plates and the steel plate core layer in terms of hysteretic energy dissipation and explosion energy absorption. It takes into account both the seismic and blast resistance performance of SPSW, and basically achieves the goal of coordinating the structural performance requirements under the two disasters.
[0023] (2) Perforations are added to the traditional steel plate used on the outer side to form an elliptical perforated negative Poisson's ratio steel plate, which effectively controls the out-of-plane buckling deformation of the outer steel plate without relying on out-of-plane constraints. Discrete analysis of the negative Poisson's ratio member shows that the negative Poisson's ratio characteristic increases the axial stiffness of the compression member, thereby increasing the overall stiffness of the SPSW; and the buckling folding amount (out-of-plane deformation) between the strips of the steel plate under the action of the compression member will decrease, thereby reducing the wrinkling of the SPSW after buckling under cyclic loading, delaying its tearing and bearing capacity degradation. Under the premise of the same amount of steel, the negative Poisson's ratio SPSW has a larger hysteresis loop area and exhibits greater initial stiffness and bearing capacity, as well as better ductility, which has a significant advantage in reducing the out-of-plane deformation of the steel plate and has a significant gain effect on the hysteretic performance of the SPSW. The gain effect of the perforated configuration on the seismic performance of the SPSW is expected to help solve the problem of the serious weakening of the lateral stiffness and bearing capacity of the traditional perforated SPSW.
[0024] (3) The sandwich structure adopts a negative Poisson's ratio concave honeycomb configuration. Comparing the deformation mechanism and explosion energy absorption characteristics of conventional honeycomb sandwich structures and concave honeycomb negative Poisson's ratio sandwich structures under explosive loads, the explosion energy absorption capacity of both conventional honeycomb structures and negative Poisson's ratio concave honeycomb structures is significantly improved compared to ordinary steel plates of the same mass. Under explosive loads, ordinary steel plates exhibit stress and strain localization, affecting energy absorption; further, compared to conventional honeycomb structures, the negative Poisson's ratio metamaterial honeycomb structure absorbs 17% more explosion energy. Simultaneously, the energy absorption ratio of the negative Poisson's ratio core layer is significantly higher than that of the core layer in conventional honeycomb structures, with the concave honeycomb core layer absorbing over 90% of the overall explosion energy. Maintaining the relative density of the sandwich layers while further increasing the energy absorption ratio of the intermediate sandwich layers improves the energy absorption capacity of the sandwich layers and the SPSW as a whole; this is beneficial for resisting impact explosion loads and absorbing explosion energy.
[0025] (4) By focusing on the macroscopic distribution and transmission path of materials, it is hoped that the proposed novel Auxetics-SPSW can achieve a negative Poisson's ratio effect on a macroscopic scale through optimized structural design, without changing the microstructure of the materials (using ordinary structural steel as the base material, such as Q345 steel). This macroscopic negative Poisson's ratio steel plate shear wall has low requirements for materials, processing technology, and cost, which is beneficial for engineering applications. Attached Figure Description
[0026] Figure 1 An exploded view of a negative Poisson's ratio composite steel plate shear wall structure;
[0027] Figure 2 This is a partially enlarged structural diagram of the bolt hole section;
[0028] Figure 3 for Figure 1 Schematic diagram of the structure of section AA in the middle;
[0029] Figure 4 The diagram shows the structure of the outer steel plate and the corrugated plate (bolt holes are not shown), where (a) is the outer steel plate and (b) is the corrugated plate.
[0030] Figure 5 A schematic diagram illustrating the approach to improving the dual-hazard resistance of SPSW structures;
[0031] Figure 6 A schematic diagram of the deformation mechanism when performing discrete analysis on a negative Poisson's ratio member, where (a) is a steel plate shear wall strip model, (b) is the deformation of a conventional steel plate tensile strip, and (c) is the deformation of a negative Poisson's ratio steel plate tensile strip.
[0032] In the diagram: 1-Outer steel plate; 2-Sandwich layer; 3-Edge component; 4-Tie bolt; 5-Plate. Detailed Implementation
[0033] The present invention will now be described in detail with reference to the accompanying drawings and specific embodiments.
[0034] like Figure 5 As shown, this paper presents the approach to improving the dual-hazard resistance performance of SPSW structures. Method I is a traditional single-hazard resistance design method, which can only meet one of the performance requirements. Method II is a traditional method for improving the performance of structures with multiple hazards, such as waveform SPSW or combined SPSW, but the performance improvement is limited and it is difficult to meet the performance requirements of both seismic resistance and blast resistance at the same time. Method III is a method for improving the multi-hazard resistance performance of structures based on the disaster-splitting design concept. By adding disaster-splitting units to design a new type of composite SPSW and optimizing its form, it can not only meet the performance requirements at the same time, but also achieve a significant improvement effect.
[0035] This invention, based on Method III, designs a lateral force resisting structural system composed of a novel energy-dissipating support, prestressed tendons, and structural members. The three main components play different roles: the energy-dissipating device (sandwich layer 2) acts as a "structural fuse," dissipating most of the seismic energy and controlling damage to the main structure; the prestressed tendons (outer steel plate 1) enable the structure to achieve self-resetting; and the structural members (edge members 3) work together with the prestressed tendons to resist loads. The three main components work collaboratively to construct a novel, recoverable functional structural system with superior seismic performance. The "structural fuse" seismic design method is also often referred to as "structural disaster-distribution seismic design." It adopts the performance enhancement concept against dual disasters, starting from the technical route of "component / sub-function - system / functional integration," and considers adding SPSW disaster-distribution units.
[0036] Example
[0037] A negative Poisson's ratio composite steel plate shear wall, such as Figure 1-4 As shown, it includes a negative Poisson's ratio member and an edge member 3;
[0038] The negative Poisson's ratio component includes a core layer 2 disposed in the middle and outer steel plates 1 disposed on both sides of the core layer 2; the outer steel plates 1 are connected to the edge component 3, the core layer 2 is disposed inside the edge component 3, and the core layer 2 is connected to the outer steel plates 1.
[0039] Both the outer steel plate 1 and the sandwich layer 2 have a negative Poisson's ratio configuration.
[0040] More specifically, in this embodiment:
[0041] like Figure 1 As shown, a novel negative Poisson's ratio composite steel plate shear wall includes an outer steel plate 1 with a negative Poisson's ratio, a core layer 2 with a negative Poisson's ratio, an edge member 3, tie bolts 4, and a pad 5.
[0042] Outer steel plate 1, such as Figure 4 As shown in (a), it is prepared by cutting a whole steel plate to form periodically orthogonally distributed elliptical perforations, and by structural processing to give it the characteristic of negative Poisson's ratio. In addition to the elliptical perforations, bolt holes are also provided in an array on the outer steel plate 1, and bolt holes are also provided at intervals on the four edges.
[0043] Sandwich layer 2, such as Figure 3 and Figure 4 As shown in (b), the structure is formed by stacking and connecting multiple corrugated plates with the same waveform. Each corrugated plate is designed and processed into a concave zigzag shape. The multiple corrugated plates are symmetrically spliced, with crests facing crests and troughs facing troughs. Then, tie bolts 4 are used to fix each corrugated plate and the outer steel plate 1 at the crests / troughs, so that the entire negative Poisson's ratio component forms a multi-layered star-shaped (concave honeycomb-shaped) negative Poisson's ratio configuration in the thickness section, as shown in (b). Figure 3 As shown. Further as... Figure 2 As shown, the bolt holes on each corrugated plate in the sandwich layer 2 are elongated elliptical; a pad 5 is provided between the tie bolt 4 and the outer steel plate 1, and is pressed against the surface of the outer steel plate 1 by the tie bolt 4; a certain preload is applied to the tie bolt 4 during assembly so that the tie bolt 4 only restricts the out-of-plane displacement of the sandwich layer 2, that is, the sandwich layer 2 can be translated in-plane.
[0044] The core layer 2 is disposed within the space formed by the edge member 3, but is only connected to the outer steel plates 1 located on both sides of it by tie bolts 4; the outer steel plates 1 are further fixedly connected to the edge member 3 by bolts and threaded holes opened at the edge. It can be seen that in this structure, the edge member 3 and the outer steel plate 1 are fixed structures and will not undergo relative displacement, while the core layer 2 has a certain planar mobility and can undergo in-plane translation within the space enclosed by the edge member 3.
[0045] Generally, the shear modulus G of a material can be expressed by Poisson's ratio ν as: G = E / 2(1+ν), where E is the elastic modulus of the material. When the Poisson's ratio is negative, it has a larger shear modulus than materials with a positive Poisson's ratio. In this invention, as... Figure 6 As shown, the negative Poisson's ratio member is discretized into a series of mutually parallel oblique tension members and a diagonal compression member. Figure 6 (a) are used to simulate the tensile bands formed by horizontal shear force on a steel plate shear wall after buckling, and the compressive force on the corner area of the steel plate wall. Under axial tensile force, the cross-sectional area of a conventional steel plate strip will shrink ( Figure 6 (b) Under axial tensile force, the cross-sectional direction of a negative Poisson's ratio steel strip will extend outward. Figure 6(c) Under this special deformation mechanism of the negative Poisson's ratio steel plate, the pressure from the compression members at the opposite corners of the steel plate wall first needs to counteract the lateral expansion deformation of the steel plate wall strips, and then continue to apply force in the cross-sectional direction of the strips, causing the SPSW to buckle and fold. At the same time, the overall deformation mechanism of the negative Poisson's ratio metamaterial honeycomb sandwich layer 2 allows the stress wave caused by the explosive shock wave to propagate over a wider range within the structure; when subjected to impact loads, the local compression points will undergo lateral contraction deformation, showing a tendency to densify, and the density will increase instantaneously.
[0046] The above description of the embodiments is provided to enable those skilled in the art to understand and use the invention. It will be apparent to those skilled in the art that various modifications can be made to these embodiments, and the general principles described herein can be applied to other embodiments without inventive effort. Therefore, the present invention is not limited to the above embodiments, and any improvements and modifications made by those skilled in the art based on the disclosure of the present invention without departing from the scope of the invention should be within the protection scope of the present invention.
Claims
1. A negative Poisson's ratio composite steel plate shear wall, characterized in that, Including negative Poisson's ratio members and edge members (3); The negative Poisson ratio component includes a sandwich layer (2) disposed in the middle and outer steel plates (1) disposed on both sides of the sandwich layer (2); the outer steel plates (1) are connected to the edge component (3), the sandwich layer (2) is disposed inside the edge component (3), and the sandwich layer (2) is connected to the outer steel plate (1). Both the outer steel plate (1) and the sandwich layer (2) have a negative Poisson's ratio configuration.
2. The negative Poisson's ratio composite steel plate shear wall according to claim 1, characterized in that, The outer steel plate (1) has periodically perforated holes arranged in an orthogonal pattern.
3. A negative Poisson's ratio composite steel plate shear wall according to claim 2, characterized in that, The perforation is elliptical.
4. A negative Poisson's ratio composite steel plate shear wall according to claim 1, characterized in that, The sandwich layer (2) has a concave honeycomb structure in the thickness direction; the sandwich layer (2) is composed of several corrugated plates; the corrugated plates are in a concave zigzag shape with the peaks facing each other.
5. A negative Poisson's ratio composite steel plate shear wall according to claim 1 or 4, characterized in that, The outer steel plate (1) and the sandwich layer (2) are connected by tie bolts (4).
6. A negative Poisson's ratio composite steel plate shear wall according to claim 4, characterized in that, Each corrugated plate is connected by tie bolts (4) to form a sandwich layer (2).
7. A negative Poisson's ratio composite steel plate shear wall according to claim 5, characterized in that, The bolt holes on the sandwich layer (2) for passing through the tie bolts (4) are elongated elliptical.
8. A negative Poisson's ratio composite steel plate shear wall according to claim 5, characterized in that, The outer steel plate (1) is also provided with a pad (5) at the bolt hole through which the tie bolt (4) passes, and the pad (5) is pressed between the outer steel plate (1) and the tie bolt (4).
9. A negative Poisson's ratio composite steel plate shear wall according to claim 5, characterized in that, The tie bolt (4) is preloaded.
10. A negative Poisson's ratio composite steel plate shear wall according to claim 1, characterized in that, The material of the negative Poisson's ratio component includes structural steel.