A new type of buckling restrained device

Abstract

The utility model relates to the field of structural engineering anti-seismic technology discloses a new buckling restrained device, and the device adopts the innovative multilevel restraint system design, including core component, restraint component and preloading component, and core component and restraint component are both double -deck structure, and restraint component is sleeved in the core component outer layer, and preloading component sets up in the both ends of core component, and core component includes square corrugated board and cross support board, and square corrugated board is combined by four corrugated boards, and every corrugated board is intermittently welded with cross support board, and through optimizing wave geometry parameter and grading restraint system, the critical buckling load is improved by more than 50%, and single weight control is below 180kg / m, adopts numerical control hydraulic forming and modular assembly process, improves construction efficiency, and is especially suitable for high-rise building and large-span bridge engineering in high intensity area.

Description

Technical Field

[0001] This utility model relates to the field of seismic resistance technology in structural engineering, and in particular to a novel buckling restraint device. Background Technology

[0002] In the fields of building structures, bridge engineering, and mechanical seismic resistance, buckling failure of components under seismic loading is one of the main risks leading to structural damage. As a core energy-dissipating component, buckling restraint devices have become a key technology for improving the seismic performance of structures by limiting the lateral deformation of core components and guiding their axial plastic energy dissipation.

[0003] Existing buckling restraint devices with core structures are only suitable for in-plane shear or unidirectional restraint, which cannot meet the seismic requirements under multi-directional seismic loading. Under bidirectional seismic loading, the restraint efficiency is insufficient (the stiffness in the Y direction is only 35% of that in the X direction) and the overall cost is high. Although some patents have attempted to improve this by using multi-cavity steel restraint (CN110859410A) or SMA wire reinforcement (US2021007986), there are still drawbacks such as excessively high processing accuracy requirements (±0.1mm), a 300% increase in cost, and excessive weight (220kg / m). Utility Model Content

[0004] To overcome the above shortcomings, this utility model provides a novel buckling restraint device, which aims to improve the shortcomings of existing buckling restraint devices. The core structure of these devices is only suitable for in-plane shear resistance or unidirectional restraint, which cannot meet the seismic resistance requirements under multi-directional seismic action, as well as the defects of insufficient restraint efficiency and high overall cost under bidirectional seismic action.

[0005] To achieve the above objectives, the present invention adopts the following technical solution: a novel buckling restraint device, comprising a core component, a restraint component, and a pre-tightening component. Both the core component and the restraint component are double-layered structures, with the restraint component sleeved on the outer layer of the core component and the pre-tightening component disposed at both ends of the core component. The core component comprises a square corrugated plate and a cross support plate. The square corrugated plate is composed of four corrugated plates, and each corrugated plate is intermittently welded to the cross support plate with a weld spacing ≤200mm. The gap between the inner restraint steel plate and the core is controlled at 1.5±0.3mm. The diameter tolerance of the high-strength bolt holes connecting the lugs is +0.2mm / -0mm, and the hole spacing tolerance is ±0.5mm. The corrugated plate achieves multi-directional equal stiffness characteristics through specific geometric parameters (wave height h=0.15-0.25B, wavelength λ=2-3h), while the cross plate effectively improves the buckling resistance in the diagonal direction.

[0006] As a further description of the above technical solution:

[0007] The constraint assembly includes an inner constraint plate and an outer sleeve. The inner constraint plate is a square plate composed of four straight plates, each of which is welded to a cross support plate. The outer sleeve is welded and fitted onto the outside of the cross support plate. A unique dual protection mechanism is adopted: firstly, the inner constraint steel plate directly covers the core as the first constraint layer; secondly, the steel sleeve forms the second constraint. A controllable gap is maintained between the two to balance the constraint effect and deformation requirements. This graded constraint design has been verified by finite element analysis and can increase the critical buckling load of the device by more than 50% while maintaining excellent energy dissipation performance (equivalent damping ratio ≥ 0.35).

[0008] As a further description of the above technical solution:

[0009] The outer sleeve is fixedly connected to two end plates, and each end plate has several prestressing tendon holes. Reinforcing rings are provided around the prestressing tendon holes to ensure the reliability of the pre-tightening assembly under high load and long service life.

[0010] As a further description of the above technical solution:

[0011] The prestressing assembly includes anchors and high-strength prestressing tendons. Several high-strength prestressing tendons pass through prestressing tendon holes and through an outer sleeve. Several anchors are positioned on the outer end face of the end plate to fix the high-strength prestressing tendons. After the high-strength prestressing tendons are inserted into the prestressing tendon holes, a three-stage tensioning process (0.1fptk→0.2fptk→0.25fptk) is used to apply a prestress of not less than 0.2 times the yield strength. Finally, it is locked with dedicated anchors. This prestressing system not only improves the overall integrity of the device but also effectively controls initial defects during construction. Test data shows that it can reduce residual deformation by more than 40%. All connection nodes adopt a standardized design, supporting automated robotic installation. The on-site assembly time for a single support can be controlled within 2 hours.

[0012] As a further description of the above technical solution:

[0013] An ear plate is fixedly connected to the outer end face of any of the blocking plates. The ear plate is provided with high-strength bolt holes, and bolts of grade 8.8 or above are used to ensure a reliable connection with the main structure.

[0014] As a further description of the above technical solution:

[0015] Reinforcing ribs are welded to both ends of any of the ear plates, which improves the stability and reliability of the overall device.

[0016] As a further description of the above technical solution:

[0017] The inner surface of the inner constraint plate is provided with elastic limiting protrusions. Under small earthquakes, the protrusions allow the core component to buckle moderately and dissipate energy through elastic deformation, avoiding premature rigid constraint from affecting the coordination of elastic deformation. Under large earthquakes, the protrusions provide progressive constraint reaction force through elastic compression, which together with the inner constraint plate suppresses excessive buckling of the core component, thereby enhancing the constraint efficiency and stability of the device under complex seismic loads.

[0018] As a further description of the above technical solution:

[0019] The elastic limiting protrusions correspond one-to-one with the crests of the square corrugated plate in the circumferential direction.

[0020] This utility model has the following beneficial effects:

[0021] 1. In this utility model, the core component firstly adopts a combined cross section of a square corrugated plate and a cross support plate. The constraint component forms a square inner constraint plate spliced ​​from four straight plates and an outer sleeve, creating equal constraints on all four sides. This ensures that the constraint stiffness ratio in the X and Y directions is close, preventing premature component failure due to excessive constraint in a single direction. While guaranteeing axial stiffness, it solves the problem of insufficient multi-directional constraint in traditional BRBs. Furthermore, the cross support plate and the square corrugated plate are welded using an intermittent welding process. When the corrugated plate undergoes axial bulging, the non-welded area can slightly shift, avoiding the restriction of the corrugated plate's free deformation by rigid connections.

[0022] 2. The graded restraint system, while ensuring restraint effectiveness, controls the weight of a single component to below 180 kg / m, reducing weight by 35% compared to traditional concrete-filled BRBs. This meets the stringent requirements of GB50011-2020 for the bearing capacity stability of support components at a 1 / 50 displacement angle, as well as the "dual carbon" target's need for reduced-weight construction. Furthermore, the modular prestressed assembly system significantly improves construction efficiency and supports rapid replacement after earthquakes. This device is particularly suitable for important infrastructure such as super high-rise buildings, long-span bridges, and nuclear power plants in areas with seismic fortification intensity of 8 degrees or higher. Attached Figure Description

[0023] Figure 1 This is a front view of the present invention;

[0024] Figure 2 This is a cross-sectional view of the present invention;

[0025] Figure 3 This is a top view of the present invention;

[0026] Figure 4 This utility model Figure 1 Sectional view of section AA in the image;

[0027] Figure 5 This is a schematic diagram of the inner constraint plate structure in Embodiment 2 of this utility model.

[0028] Legend:

[0029] 1. Ear plate; 2. Blocking plate; 3. Anchor; 4. High-strength prestressed tendon; 5. Inner restraint plate; 6. Cross support plate; 7. Square corrugated plate; 8. Outer sleeve; 9. Reinforcing rib; 10. Elastic limiting protrusion. Detailed Implementation

[0030] The technical solutions of the present utility model will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some embodiments of the present utility model, and not all embodiments. Based on the embodiments of the present utility model, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the protection scope of the present utility model.

[0031] Example 1: Refer to Figure 1-3 A novel buckling restraint device includes a core component, a restraint component, and a pretensioning component. Both the core component and the restraint component are double-layered structures. The restraint component is fitted over the core component, and the pretensioning components are located at both ends of the core component. The core component includes a square corrugated plate 7 and a cross-shaped support plate 6. The square corrugated plate 7 is composed of four corrugated plates, each of which is intermittently welded to the cross-shaped support plate 6. The restraint component includes an inner restraint plate 5 and an outer sleeve 8. The inner restraint plate 5 is a square plate composed of four straight plates, each of which is welded to the cross-shaped support plate 6. The outer sleeve 8 is welded and fitted over the outside of the cross-shaped support plate 6. End plates 2 are fixedly connected to both ends of the outer sleeve 8, and several prestressing tendon holes are formed on any of the end plates 2. The pretensioning component includes anchors 3 and high-strength prestressing tendons 4. Several high-strength prestressing tendons 4 pass through the prestressing tendon holes and through the outer sleeve 8. Several anchors 3 are located on the outer end face of the end plates 2 for fixing the high-strength prestressing tendons 4. An ear plate 1 is fixedly connected to the outer end face of any end plate 2, and high-strength bolt holes are provided on the ear plate 1. Reinforcing ribs 9 are welded to both ends of any ear plate 1.

[0032] First, prefabrication is carried out in the factory. Corrugated steel plate 7 is processed using CNC hydraulic forming technology, controlling the wave height tolerance to ±1mm. Cross steel plate 6 is plasma-cut and then intermittently welded to the corrugated steel plate for positioning. The weld must meet the UT inspection BⅠ level standard. During on-site assembly, the composite core is first hoisted into place, and the gap between it and the inner constraint steel plate 5 is adjusted to 1.5±0.3mm. The inner constraint steel plate 5 is fixed to the cross steel plate by welding, ensuring that the center of the straight plate is aligned with the wave crest of the corrugated plate, spliced ​​into a square, and the gap between it and the corrugated plate meets the requirements. Then, the outer sleeve 8 is fitted and the end plates 2 are welded. When installing the ear plate 1, the bolt hole spacing and the verticality of the ear plate 1 are calibrated. Then, high-strength prestressing tendons 4 are used to tension the prestressing tendons in stages to 0.25fptk and anchored with anchors 3. Finally, quality acceptance is carried out. Three-dimensional laser scanning is used to focus on inspecting the geometric dimensions of the corrugated plate, the prestressing tension value is controlled by the oil pressure gauge and elongation, and the overall stiffness is tested by the frequency method.

[0033] Example 2: Referring to the figure, this example improves the inner constraint steel plate 5 based on Example 1. Elastic limiting protrusions 10 are provided on the inner surface of the inner constraint plate 5. The elastic limiting protrusions 10 correspond one-to-one with the crests of the square corrugated plate 7 in the circumferential direction.

[0034] The elastic limiting protrusions 10 are linearly arrayed along the inner sides of the inner constraint plate 5, corresponding to the crests of the square corrugated plate 7. They form precise point-to-point constraint units with the crests, and the spacing is equal to the wave pitch of the corrugated plate. Under small earthquakes, the protrusions allow the core components to buckle moderately through elastic deformation to dissipate energy, avoiding premature rigid constraints from affecting the coordination of elastic deformation. Under large earthquakes, they provide progressive constraint reaction force through elastic compression, which, together with the inner constraint plate 5, suppresses excessive buckling of the core components and enhances the constraint efficiency and stability of the device under complex seismic loads.

[0035] Finally, it should be noted that the above description is only a preferred embodiment of the present utility model and is not intended to limit the present utility model. Although the present utility model has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present utility model should be included within the protection scope of the present utility model.

Claims

1. A novel buckling restraint device, comprising a core component, a restraint component, and a preload component, characterized in that: Both the core component and the constraint component have a two-layer structure. The constraint component is nested on the outer layer of the core component, and the preload component is set at both ends of the core component. The core components include a square corrugated plate (7) and a cross support plate (6). The square corrugated plate (7) is composed of four corrugated plates, and each corrugated plate is intermittently welded to the cross support plate (6).

2. The novel buckling restraint device according to claim 1, characterized in that: The constraint assembly includes an inner constraint plate (5) and an outer sleeve (8). The inner constraint plate (5) is a square plate composed of four straight plates, and each straight plate is welded to the cross support plate (6). The outer sleeve (8) is welded and sleeved on the outside of the cross support plate (6).

3. The novel buckling restraint device according to claim 2, characterized in that: The outer sleeve (8) is fixedly connected to two end plates (2), and several prestressing tendon holes are opened on any of the end plates (2), and reinforcing rings are provided around the prestressing tendon holes.

4. A novel buckling restraint device according to claim 3, characterized in that: The pre-tightening assembly includes anchors (3) and high-strength prestressed tendons (4). Several high-strength prestressed tendons (4) pass through prestressed tendon holes and through the outer sleeve (8). Several anchors (3) are set on the outer end face of the blocking plate (2) for fixing the high-strength prestressed tendons (4).

5. A novel buckling restraint device according to claim 3, characterized in that: An ear plate (1) is fixedly connected to the outer end face of any of the blocking plates (2), and a high-strength bolt hole is provided on the ear plate (1).

6. A novel buckling restraint device according to claim 5, characterized in that: Reinforcing ribs (9) are welded to both ends of any of the ear plates (1).

7. A novel buckling restraint device according to claim 2, characterized in that: The inner surface of the inner constraint plate (5) is provided with elastic limiting protrusions (10).

8. A novel buckling restraint device according to claim 7, characterized in that: The elastic limiting protrusions (10) correspond one-to-one with the crests of the square corrugated plate (7) in the circumferential direction.

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