All-steel buckling-restrained brace with double-order stress and recoverable function

Abstract

The all-steel buckling-restrained brace comprises an energy dissipation brace body and outer constraint clamping plates symmetrically arranged on the upper side and the lower side of the energy dissipation brace body, the energy dissipation brace body comprises an inner core and cross-shaped inner core rib plates fixedly arranged at the two ends of the inner core, and the outer constraint clamping plates comprise clamping plates; the two ends of each clamping plate are each provided with a penetrating groove allowing a vertical inner core rib plate to vertically penetrate through, an inner core connecting base is fixedly arranged at the rear end, penetrating out of the penetrating groove, of the inner core rib plate at one end, and clamping plate connecting bases are symmetrically arranged on the clamping plates on the two sides of the inner core connecting base and located on the same level as the clamping plates to be connected with sacrificial plates. The sacrifice plate is fixed to the clamping plate connecting base and the inner core connecting base through high-strength bolts, the double-stage bearing capacity reduction design is adopted, and effective control over structural deformation and accurate guide over damage evolution are achieved through a bearing capacity degradation mechanism. And after an earthquake, the anti-seismic performance of the support can be quickly recovered only by replacing the sacrificial plate, and the repairability of the structure is remarkably improved.

Description

Technical Field

[0001] This invention relates to the field of seismic resistance technology for civil structures, specifically to an all-steel buckling-resistance brace with dual-stage stress and functional recovery. Background Technology

[0002] In the field of seismic design, energy dissipation and damping devices, as passively controlled energy-consuming elements, effectively reduce structural response by absorbing and dissipating seismic energy, thereby reducing structural damage and improving seismic performance. Traditional buckling-restrained braces (BRBs) are widely used in structural seismic design and strengthening due to their well-defined mechanisms, stable performance, and simple construction. However, with the development of modern seismic design theory, the performance-based multi-level seismic design concept places higher demands on energy-dissipating components. Traditional BRBs, due to their single load-bearing capacity, are insufficient to meet the differentiated performance requirements of structures under seismic loading of varying intensities. Therefore, researchers have developed load-bearing capacity-enhanced BRBs with multi-stage load-bearing characteristics to optimize their seismic performance.

[0003] However, existing research indicates that, on the one hand, excessive load-bearing capacity and stiffness may delay the entry into plasticity, affecting the energy dissipation effect under major earthquakes and preventing the achievement of optimal "fuse" performance; on the other hand, excessively high load-bearing capacity design can significantly increase the internal forces of adjacent components, exacerbating structural damage. It is worth noting that related research has confirmed that scientifically sound load-bearing capacity reduction design can effectively improve the energy dissipation effect of BRBs, providing an important theoretical basis for the development of new BRBs.

[0004] In recent years, with the promotion of the concept of resilient structures, seismic design with recoverable functions has become a research hotspot. Traditional BRBs require complete replacement after being damaged in a major earthquake to restore their seismic performance, resulting in a long repair cycle and affecting the rapid recovery and use of the structure. Therefore, developing new BRBs that combine multi-level seismic performance, high-efficiency energy dissipation capacity, and post-earthquake recoverability has become a key technological direction for improving structural toughness. Summary of the Invention

[0005] In view of the shortcomings of existing technologies, the technical problem to be solved by this invention is to provide an all-steel buckling-resistance brace with dual-stage stress and functional recoverability. During minor earthquakes, the brace maintains overall elasticity, providing additional stiffness and controlling structural deformation. During major earthquakes, the bearing capacity of the brace is weakened through the fracture mechanism of the sacrificial plate, thereby guiding damage and ensuring efficient energy dissipation. During post-earthquake repair, only the sacrificial plate needs to be replaced to quickly restore the seismic performance of the brace, significantly improving the recoverability and economy of the brace.

[0006] To solve the above-mentioned technical problems, the technical solution of the present invention is: an all-steel buckling-resistance brace with dual-stage stress and functional recovery, comprising an energy-dissipating brace and symmetrically arranged outer constraint plates on its upper and lower sides. The energy-dissipating brace includes an inner core and inner core ribs fixed at both ends of the inner core in a cross shape. The outer constraint plates include clamps. Both ends of the clamps are provided with through slots for the vertical inner core ribs to pass through vertically. An inner core connecting base is fixed at the end of one end of the inner core rib after it passes through the through slot. On the clamps on both sides of the inner core connecting base, clamp connecting bases of the same level are symmetrically arranged to connect sacrificial plates. The sacrificial plates are fixed to the clamp connecting bases and the inner core connecting bases respectively by high-strength bolts.

[0007] Furthermore, lateral constraint plates are symmetrically arranged on both sides of the inner core. These lateral constraint plates extend in the same direction along the length of the clamping plate and are secured vertically through the upper clamping plate, the lateral constraint plate, and the lower clamping plate in sequence by several high-strength bolts along the extension direction.

[0008] Furthermore, both the inner core connecting base and the clamping plate connecting base are bent vertically upwards at their longitudinal ends, and threaded holes for screws to be screwed into are longitudinally opened in the bent portions, with the ends of the screws abutting against the sacrificial plate.

[0009] Furthermore, the sacrificial plate is provided with a number of bolt holes for high-strength bolts to pass through, and the sacrificial plate is also provided with vertically arranged weakening elongated holes, which are staggered from the bolt holes.

[0010] Furthermore, on the side of the clamping plate away from the sacrificial plate, clamping plate ribs are symmetrically arranged on both sides of the inner core rib plate, and the inner core rib plate is between the two clamping plate ribs and is locked in place by screws laterally.

[0011] Furthermore, the rib plate has several threaded holes through which the transverse tubes pass to allow screws to be threaded through the rib plate and fastened to the inner core rib plate.

[0012] Furthermore, the inner core has gaskets placed between the upper and lower ends of the end away from the sacrificial plate and the clamping plate, and is secured vertically by high-strength bolts.

[0013] Furthermore, each of the clamps is fixed with at least one set of longitudinally extending longitudinal stiffening ribs, and both ends of the longitudinal stiffening ribs are fixed with transversely extending transverse stiffening ribs.

[0014] Furthermore, one longitudinal end of the lateral constraint plate extends outward at an angle to form an extension portion for horizontally engaging with the horizontally arranged inner core rib plate, and this extension portion also corresponds to the end of the clamping plate on that side.

[0015] Furthermore, air gaps are reserved between the inner core and the lateral constraint plates on both sides of the inner core rib.

[0016] Compared with the prior art, the present invention has the following beneficial effects: 1. Lightweight. This invention adopts an all-steel structure design, which significantly reduces the self-weight of components and the load on the main structure while ensuring the same seismic performance, compared with traditional concrete buckling-restrained braces. It is especially suitable for seismic optimization of high-rise buildings and large-span spatial structures.

[0017] 2. Post-earthquake functional recovery. This invention utilizes a unique modular sacrificial plate structure, allowing for restoration of support performance after an earthquake by simply replacing damaged components, avoiding complete demolition. Maintenance requires no large equipment, significantly reducing building functional interruption time and post-disaster repair costs.

[0018] 3. Improved energy dissipation. This invention employs an innovative phased load-bearing capacity reduction design concept, which enables the support to effectively control structural deformation during minor earthquakes and guide damage during major earthquakes, thereby improving the energy dissipation effect of the support.

[0019] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. Attached Figure Description

[0020] Figure 1 This is a schematic diagram illustrating the structure of an embodiment of the present invention; Figure 2 This is a top view of an embodiment of the present invention; Figure 3 This is a front view of an embodiment of the present invention; Figure 4 This is a three-dimensional exploded view of an embodiment of the present invention; Figure 5 This is a top view of the constraint clamp in an embodiment of the present invention; Figure 6 This is a schematic diagram illustrating the cooperation between the clamping plate and the lateral constraint plate in an embodiment of the present invention; Figure 7 This is a top view of the energy-consuming support in an embodiment of the present invention; Figure 8 for Figure 7 The front view; Figure 9 This is a schematic diagram of the sacrificial plate structure in an embodiment of the present invention; Figure 10 for Figure 2 Schematic diagram of the cross section at point AA; Figure 11 for Figure 2 Schematic diagram of the cross section at point BB; Figure 12 for Figure 2 Cross-sectional view at point CC; Figure 13 for Figure 2Schematic diagram of the cross section at point DD; Figure 14 for Figure 2 Schematic diagram of the cross section at the middle EE; Figure 15 This is a schematic diagram illustrating the working principle of an embodiment of the present invention.

[0021] In the diagram: 1-Energy dissipation support; 101-Inner core; 102-Inner core rib; 103-Inner core connecting base; 2-Outer constraint clamp; 201-Clamp connecting base; 202-Transverse stiffening rib; 203-Longitudinal stiffening rib; 204-Clamp rib; 205-Lateral constraint plate; 206-Shim; 207-Through groove; 208-Clamp; 3-Sacrificial plate; 301-Weakening elongated hole; 4-High-strength bolt; 5-Screw; 6-Air gap. Detailed Implementation

[0022] To make the above features and advantages of the present invention more apparent and understandable, specific embodiments are described below in conjunction with the accompanying drawings for detailed explanation.

[0023] like Figures 1-15 As shown, an all-steel buckling-restrained brace with dual-stage stress and functional recovery is disclosed. The brace consists of an energy-dissipating brace 1, an outer restraint plate 2, and a sacrificial plate 3 arranged in parallel. The energy-dissipating brace 1 is held in place by the symmetrically arranged outer restraint plates 2 and fixed with high-strength bolts 4 and screws 5. The sacrificial plate 3 is fixed to the energy-dissipating brace 1 and the outer restraint plates 2 by high-strength bolts 4 and screws 5. The energy-dissipating brace 1 includes an inner core 101, inner core ribs 102, and an inner core connecting base 103. The outer restraint plate 2 includes a plate connecting base 201, transverse stiffening ribs 202, longitudinal stiffening ribs 203, plate ribs 204, lateral restraint plates 205, and gaskets 206.

[0024] In this embodiment of the invention, combined with Figure 4 , Figure 7 , Figure 8 , Figure 10 and Figure 14 In order to fix the sacrificial plate 3 and prevent it from sliding, the inner core rib plate 102 at the left end of the inner core 101 is provided with an inner core connecting base 103, which is provided with bolt holes and threaded holes; in addition, the right end of the inner core 101 is provided with bolt holes for fixing the outer constraint clamp 2; the inner core rib plate 102 at the right end of the inner core 101 is provided with threaded holes for secure connection with the outer constraint clamp 2.

[0025] In this embodiment of the invention, combined with Figures 1-8 , Figure 12 and Figure 14To prevent buckling of the outer restraint plate 2, the outer restraint plate 2 is provided with longitudinal stiffening ribs 203 and transverse stiffening ribs 202 in the longitudinal and transverse directions, respectively; the outer restraint plate 2 is provided with a lateral restraint plate 205 and a gasket 206 that match the shape of the inner core 101 inside; in addition, the outer restraint plate 2 is provided with bolt holes, and the inner core 101 is clamped and fixed in the middle by high-strength bolts 4, thereby effectively preventing it from buckling under pressure; the right end of the outer restraint plate 2 is provided with a clamping rib 204, which is provided with threaded holes for a stable connection with the inner core rib 102.

[0026] In this embodiment of the invention, combined with Figures 1-9 , Figure 11 The sacrificial plate 3 is provided with bolt holes, and the inner core connecting base 103 and the clamping plate connecting base 204 are provided with bolt holes and threaded holes. The sacrificial plate 3 is fixed to the inner core connecting base 103 and the clamping plate connecting base 204 by high-strength bolts 4, and then tightened to its side by screws 5 to prevent slippage.

[0027] In this embodiment of the invention, combined with Figures 1-4 The inner core 101 and the sacrificial plate 3 are subjected to forces in parallel. The outer constraint plate 2 not only provides constraint on the inner core 101, but also plays the role of rigid connection, and connects the left and right ends of the energy dissipation support 1 together through the sacrificial plate 3, ensuring the stability and collaborative performance of the overall structure.

[0028] In this embodiment of the invention, combined with Figures 11-12 To prevent the inner core 101 from being constrained by the lateral expansion caused by the Poisson effect during compression, an air gap 6 is reserved between the inner core 101 and the outer constraint clamp 2.

[0029] In this embodiment of the invention, combined with Figures 1-3 , Figure 13 To prevent relative sliding between the inner core 101 and the outer constraint clamping plate 2, threaded holes are provided on the clamping plate rib 204, and screws 5 are used to fasten the inner core rib 102 and the clamping plate rib 204 through the threaded holes.

[0030] In this embodiment of the invention, combined with Figure 9 The sacrificial plate 3 employs elongated, oval-shaped weakening holes, which provide more stable hysteresis and better deformation control. When the deformation reaches a specific threshold, the sacrificial plate 3 will fracture at the hole location, thus degrading the support's performance. Furthermore, to meet different seismic requirements, the stress performance of the sacrificial plate 3 can be adjusted by modifying its geometric parameters.

[0031] In this embodiment of the invention, combined with Figures 1-4After the sacrificial plate 3 is damaged or broken, it can be quickly replaced by disassembling the high-strength bolts 4 and screws 5, thereby achieving rapid restoration and improvement of seismic performance and further enhancing the overall seismic toughness of the structure.

[0032] The hysteresis curve of the two-stage stress and functionally recoverable all-steel buckling-restrained brace proposed in this embodiment of the invention is as follows: Figure 15 As shown, its core mechanism lies in constructing a controllable damage evolution path by arranging a sacrificial plate 3 with weakening elongated holes in parallel with an energy-dissipating support 1. When deformation is small, the support exhibits high initial stiffness and yield bearing capacity, thereby effectively controlling structural deformation. When the deformation reaches a preset threshold, the sacrificial plate 3 fractures as designed, causing the stiffness and yield bearing capacity of the support system to be reduced in a controllable manner, thus forming a predetermined weak point in the structure. This design ensures that subsequent loads are mainly borne by the energy-dissipating support 1, fully utilizing its plastic deformation capacity and significantly improving the overall energy dissipation efficiency of the structure.

[0033] This invention is not limited to the preferred embodiment described above. Anyone inspired by this invention can derive various other forms of all-steel buckling-restrained braces with dual-stage stress and functional recovery. All equivalent variations and modifications made within the scope of the claims of this invention should be considered within the scope of this invention.

Claims

1. A type of all-steel buckling-restrained brace with dual-stage stress and functional recovery, characterized in that: The device includes an energy-dissipating support and symmetrically arranged outer constraint plates on its upper and lower sides. The energy-dissipating support includes an inner core and an inner core rib plate fixed at both ends of the inner core in a cross shape. The outer constraint plates include clamping plates. Both ends of the clamping plates are provided with through slots for the inner core rib plate to pass through vertically. After the inner core rib plate passes through the through slot at one end, an inner core connecting base is fixed at the end. On the clamping plates on both sides of the inner core connecting base, clamping plate connecting bases at the same level are symmetrically arranged to connect sacrificial plates. The sacrificial plates are fixed to the clamping plate connecting bases and the inner core connecting bases respectively by high-strength bolts.

2. The all-steel buckling-restrained brace with dual-stage stress and functional recovery as described in claim 1, characterized in that: The inner core is symmetrically provided with lateral constraint plates on both sides. The lateral constraint plates extend in the same direction along the length of the clamping plate and are secured vertically through the upper clamping plate, the lateral constraint plate, and the lower clamping plate in sequence along the extension direction by a number of high-strength bolts.

3. The all-steel buckling-restrained brace with dual-stage stress and functional recovery as described in claim 2, characterized in that: The inner core connecting base and the clamping plate connecting base are both bent vertically upwards at their longitudinal ends, and threaded holes for screws to be screwed in are opened longitudinally through the bent parts.

4. The all-steel buckling-restrained brace with dual-stage stress and functional recovery as described in claim 1, characterized in that: The sacrificial plate has several bolt holes arranged in an array for high-strength bolts to pass through. The sacrificial plate also has vertically arranged weakening elongated holes, which are staggered from the bolt holes.

5. The all-steel buckling-restrained brace with dual-stage stress and functional recovery as described in claim 1, characterized in that: The clamping plate has symmetrical clamping ribs on both sides of the inner core rib on the side away from the sacrificial plate. The inner core rib is between the two clamping ribs and is locked in place by screws laterally.

6. The all-steel buckling-restrained brace with dual-stage stress and functional recovery as described in claim 5, characterized in that: The rib plate has several threaded holes through which the transverse tubes pass to allow screws to be threaded through the rib plate and fastened to the inner core rib plate.

7. The all-steel buckling-restrained brace with dual-stage stress and functional recovery as described in claim 1, characterized in that: The inner core, at the end furthest from the sacrificial plate, has gaskets placed between the upper and lower ends and the clamping plate, and is secured vertically by high-strength bolts.

8. The all-steel buckling-restrained brace with dual-stage stress and functional recovery as described in claim 1, characterized in that: Each of the clamps is fixed with at least one set of longitudinally extending stiffening ribs, and both ends of the longitudinal stiffening ribs are fixed with transversely extending stiffening ribs.

9. The all-steel buckling-restrained brace with dual-stage stress and functional recovery as described in claim 1, characterized in that: The longitudinal end of each of the lateral constraint plates extends outward at an angle to form an extension portion for horizontally engaging with the inner core rib plate, and this extension portion also corresponds to the end of the clamp plate on that side.

10. A double-stressed and functionally recoverable all-steel buckling-restrained brace according to claim 9, characterized in that: Air gaps are reserved between the inner core and the lateral constraint plates on both sides of the inner core rib.

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