Assembly type self-resetting buckling restrained brace device with controllable initial rigidity

Abstract

An assembly type self-resetting buckling restrained brace with the controllable initial rigidity comprises a disc spring combination, a high-strength steel bar, a rectangular inner pipe, a rectangular outer pipe and energy consumption core plates installed between the rectangular inner pipe and the rectangular outer pipe, and the energy consumption core plates are in an L shape and arranged at the four corners of the rectangular inner pipe and the four corners of the rectangular outer pipe; the constraint requirement for the rectangular inner pipe and the rectangular outer pipe when the energy consumption core plate is pressed is greatly reduced, and the lightweight design of the support is achieved. Under the action of an earthquake, damage is concentrated on the energy consumption core plate, other parts are always in a lossless state, and the energy consumption core plate is connected with the other parts through bolts, so that quick replacement of the damaged inner core after the earthquake is facilitated, and the post-earthquake repair cost of the support can be greatly reduced. Compared with the existing self-resetting buckling restrained brace, the working mechanism of the provided assembly type self-resetting buckling restrained brace in the initial stress stage is changed, so that the controllability of the initial rigidity of the brace can be remarkably improved, and the influence of the uncertainty of the initial rigidity of the brace on the seismic response of the structure is reduced.

Description

Technical Field

[0001] The utility model relates to the technical field of buckling restraint support devices, in particular to an assembled self-resetting buckling restraint support device with controllable initial stiffness. Background Art

[0002] Based on the shortcomings of buckling restrained braces, researchers introduced prestressed devices into buckling restrained braces and proposed self-resetting buckling restrained braces. The self-resetting buckling restrained braces themselves have the ability to reset, which can enable the structure to achieve low or even no residual displacement response after an earthquake, effectively improving the post-earthquake recoverability of the main structure.

[0003] Due to the special structure and working mechanism of the self-righting buckling restrained brace, the initial stiffness of the brace is much higher than that of the buckling restrained brace with the same yield force, which increases the peak acceleration response of the structure under earthquake and increases the failure probability of non-structural components that are sensitive to acceleration. The very high initial stiffness of the self-righting buckling restrained brace is usually very sensitive to component processing errors, and the uncertainty of the initial stiffness of the brace also increases the uncertainty of the seismic response of the structure.

[0004] On the other hand, the energy dissipation components and restraint components of the self-restoring buckling restrained brace usually use a flat energy dissipation core and a rectangular cross-section steel tube. Due to the limited out-of-plane stiffness of the steel tube wall, the energy dissipation core will show obvious multi-wave buckling deformation when under pressure due to insufficient out-of-plane restraint, affecting the stability of the support hysteresis performance; the restrained tube wall is also prone to local buckling under the lateral pressure of the energy dissipation core.

[0005] Therefore, it is necessary to further develop more efficient support structures to reduce the uncertainty of the initial stiffness of the support and the constraint stiffness and strength requirements of the energy-consuming inner core on the constraint tube, so as to achieve a lightweight design of the support. Utility Model Content

[0006] In view of the shortcomings of the background technology, the purpose of the utility model is to provide an assembled self-resetting buckling restraint support device with controllable initial stiffness.

[0007] In order to achieve the above purpose, the utility model provides the following technical solutions:

[0008] An assembled self-resetting buckling restraint support device with controllable initial stiffness comprises a rectangular inner tube, a rectangular outer tube is disposed on the outer surface of the rectangular inner tube, and the connecting ends of the rectangular inner tube and the rectangular outer tube are respectively connected to connectors, and further comprises:

[0009] An energy-absorbing core plate, which is L-shaped so that the energy-absorbing core plate can be installed at the four corners between the rectangular inner tube and the rectangular outer tube, one end of the energy-absorbing core plate is connected to the connecting end of the rectangular inner tube, and the other end of the energy-absorbing core plate is connected to the connecting end of the rectangular outer tube;

[0010] Guide plates, the guide plates are respectively arranged on four surfaces of the rectangular inner tube, and the thickness of the guide plates is greater than the thickness of the energy-absorbing core plate, but the thickness of the guide plates is less than the distance between the rectangular inner tube and the rectangular outer tube; and,

[0011] A reset device is arranged inside the rectangular inner tube, and the reset device includes a disc spring device, and the two ends of the disc spring device are respectively connected to a first prestressed group and a second prestressed group, and the first prestressed group and the second prestressed group are respectively connected to a first end cover and a second end cover, and the first end cover and the second end cover are respectively locked to the rectangular inner tube and the rectangular outer tube by relying on the prestress of the first prestressed group and the second prestressed group.

[0012] Furthermore, the energy-absorbing core plate includes a yielding section, and connecting sections are respectively provided at both ends of the yielding section. The cross-sectional area of ​​the connecting section is larger than the cross-sectional area of ​​the yielding section, and the two connecting sections are respectively connected to the connecting ends of the rectangular inner tube and the rectangular outer tube.

[0013] Furthermore, a transition section with a gradually increasing cross-sectional area is provided between the yield section and the connecting section.

[0014] Furthermore, a non-adhesive material is provided on the surface of the yielding section to reduce the friction between the yielding section and the rectangular inner tube and the rectangular outer tube.

[0015] Furthermore, the connecting section is provided with connecting holes staggered with each other to reduce the weakening of the cross section of the connecting section.

[0016] Furthermore, the disc spring device includes a disc spring combination, a conduit, a disc spring baffle and a fixing bolt, wherein: the disc spring combination is composed of a single disc spring through overlapping and matching, the disc spring baffle is provided with circular holes along the periphery so that the first prestress group and the second prestress group can be passed through, the conduit is passed through the disc spring combination and the disc spring baffle, so that the disc spring combination can only produce axial deformation along the conduit, and both ends of the conduit are threaded so that the fixing bolt can be screwed in.

[0017] Furthermore, one end of the first prestressed group is connected to the first end cover, and the other end of the first prestressed group is connected to the disc spring baffle away from the first end cover; one end of the second prestressed group is connected to the second end cover, and the other end of the second prestressed group is connected to the disc spring baffle away from the second end cover.

[0018] Furthermore, the first prestressing group and the second prestressing group are respectively composed of a plurality of steel bars, and threads are provided at both ends of each of the steel bars to facilitate anchoring with anchor nuts.

[0019] Furthermore, the connecting ends are provided at four corners of one end of the rectangular inner tube and the rectangular outer tube, and the first end cover and the second end cover are respectively provided with slots adapted to the connecting ends.

[0020] Furthermore, the connector includes a connecting plate, and two sides of the connecting plate are respectively connected with connecting pieces and connecting ears, and the connecting pieces are connected to the connecting ends of the rectangular inner tube and the rectangular outer tube.

[0021] The beneficial effects of the utility model are:

[0022] 1. The support device proposed by the utility model includes a rectangular inner tube, a rectangular outer tube, and an energy-absorbing core plate installed between the rectangular inner tube and the rectangular outer tube. The energy-absorbing core plate is L-shaped and arranged at the four corners of the rectangular inner tube and the rectangular outer tube, which greatly reduces the constraint requirements of the rectangular inner tube and the rectangular outer tube when the energy-absorbing core plate is under pressure, which is conducive to the lightweight design of the support. Under the action of an earthquake, the damage is concentrated on the energy-absorbing core plate, and the other components are always in an intact state. The energy-absorbing core plate is connected to the other components by bolts, which is conducive to the rapid replacement of the damaged inner core after the earthquake, and can greatly reduce the post-earthquake repair cost of the support.

[0023] 2. In the support device proposed by the utility model, only the disc spring device applies the target prestress, and the pretension of the first prestress group and the second prestress group can be ignored compared with the prestress of the disc spring device. Compared with the existing self-resetting buckling restraint support, the proposed assembled self-resetting buckling restraint support has a different working mechanism in the initial stress stage, which can significantly improve the controllability of the initial stiffness of the support and reduce the influence of the uncertainty of the initial stiffness of the support on the seismic response of the structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 A schematic diagram of a support device of the utility model;

[0026] Figure 2 This is an exploded view of the support device of the utility model;

[0027] Figure 3It is a schematic diagram of a rectangular inner tube of the support device of the utility model;

[0028] Figure 4 It is a schematic diagram of a rectangular outer tube of the support device of the utility model;

[0029] Figure 5 It is a schematic diagram of the energy dissipation core plate of the support device of the utility model;

[0030] Figure 6 A schematic diagram of a disc spring device of a support device of the utility model;

[0031] Figure 7 It is a schematic diagram of a connector of the support device of the utility model;

[0032] Figure 8 It is a cross-sectional view of the support device of the utility model;

[0033] In the figure, 10, rectangular inner tube; 20, rectangular outer tube; 30, connecting end; 40, energy dissipation core plate; 401, yield section; 402, connecting section; 403, transition section; 404, connecting hole; 50, guide plate; 60, disc spring device; 601, disc spring combination; 602, guide tube; 603, disc spring baffle; 604, fixing bolt; 6051, first prestressed group; 6052, second prestressed group; 701, first end cover; 702, second end cover; 703, slot; 80, connector; 801, connecting plate; 802, connector; 803, connecting ear. DETAILED DESCRIPTION

[0034] Combine the following Figure 1-8 The utility model is described in detail.

[0035] An assembled self-resetting buckling restraint support device with controllable initial stiffness includes a rectangular inner tube 10, a rectangular outer tube 20 is disposed on the outer surface of the rectangular inner tube 10, and connecting ends 30 of the rectangular inner tube 10 and the rectangular outer tube 20 are respectively connected to connectors 80, and further includes:

[0036] The energy-absorbing core plate 40 is L-shaped, so that the energy-absorbing core plate 40 can be installed at the four corners between the rectangular inner tube 10 and the rectangular outer tube 20. One end of the energy-absorbing core plate 40 is connected to the connecting end 30 of the rectangular inner tube 10, and the other end of the energy-absorbing core plate 40 is connected to the connecting end 30 of the rectangular outer tube 20. A gap of 1.5-2 mm is left between the energy-absorbing core plate 40 and the rectangular inner tube 10 and the rectangular outer tube 20 to adapt to the Poisson effect when the energy-absorbing core plate 40 is under pressure and the processing error of the component;

[0037] Guide pieces 50, which are respectively arranged on four surfaces of the rectangular inner tube 10, and the thickness of the guide pieces 50 is greater than the thickness of the energy dissipation core plate 40, but the thickness of the guide pieces 50 is less than the distance between the rectangular inner tube 10 and the rectangular outer tube 20, so as to prevent the rectangular inner tube 10 and the rectangular outer tube 20 from being significantly tilted relative to each other during the compression process; and,

[0038] The reset device is arranged inside the rectangular inner tube 10, and the reset device includes a disc spring device 60. The two ends of the disc spring device 60 are respectively connected to the first prestressed group 6051 and the second prestressed group 6052. The first prestressed group 6051 and the second prestressed group 6052 are respectively connected to the first end cover 701 and the second end cover 702. The first end cover 701 and the second end cover 702 are respectively locked to the rectangular inner tube 10 and the rectangular outer tube 20 by relying on the prestress of the first prestressed group 6051 and the second prestressed group 6052.

[0039] The support device proposed by the utility model has an L-shaped energy-absorbing core plate 40, which is arranged at the four corners of the rectangular inner tube 10 and the rectangular outer tube 20, which greatly reduces the constraint requirements on the rectangular inner tube 10 and the rectangular outer tube 20 when the energy-absorbing core plate 40 is under pressure, and is conducive to realizing the lightweight design of the support. Under the action of an earthquake, the damage is concentrated on the energy-absorbing core plate 40, and the remaining components are always in an intact state. The energy-absorbing core plate 40 is connected to the remaining components by bolts, which is conducive to the rapid replacement of the damaged inner core after the earthquake, and can greatly reduce the post-earthquake repair cost of the support. Compared with the existing self-resetting buckling restraint support, only the disc spring device 60 applies pre-pressure, and the working mechanism of the support device in the initial force stage is changed, so that the controllability of the initial stiffness of the support can be significantly improved, and the influence of the uncertainty of the initial stiffness of the support on the seismic response of the structure can be reduced.

[0040] In this embodiment, the energy dissipation core plate 40 includes a yielding section 401, and connecting sections 402 are respectively provided at both ends of the yielding section 401. The cross-sectional area of ​​the connecting section 402 is larger than the cross-sectional area of ​​the yielding section 401, and the two connecting sections 402 are respectively connected to the connecting ends 30 of the rectangular inner tube 10 and the rectangular outer tube 20. A transition section 403 with a gradually increasing cross-sectional area between the yielding section 401 and the connecting section 402 is an arc-shaped transition section 403. The surface of the yielding section 401 is provided with a non-adhesive material to reduce the friction between the yielding section 401 and the rectangular inner tube 10 and the rectangular outer tube 20. The non-adhesive material can be a polytetrafluoroethylene tape or a butyl tape. The connecting section 402 is provided with interlaced connecting holes 404 to reduce the weakening of the cross section of the connecting section 402.

[0041] In this embodiment, the disc spring device 60 includes a disc spring assembly 601, a conduit 602, a disc spring baffle 603 and a fixing bolt 604, wherein: the disc spring assembly 601 is composed of a single disc spring through overlapping and matching, the disc spring baffle 603 is provided with circular holes along the periphery so that the first prestress group and the second prestress group 6052 can be passed through, the conduit 602 is passed through the disc spring assembly 601 and the disc spring baffle 603, so that the disc spring assembly 601 can only produce axial deformation along the conduit 602, and the conduit 602 has threads at both ends to facilitate the fixing bolts 604 to be screwed in.

[0042] In this embodiment, one end of the first prestressing group 6051 is connected to the first end cover 701, and the other end of the first prestressing group 6051 is connected to the disc spring baffle 603 away from the first end cover 701; one end of the second prestressing group 6052 is connected to the second end cover 702, and the other end of the second prestressing group 6052 is connected to the disc spring baffle 603 away from the second end cover 702. Further, the first prestressing group and the second prestressing group 6052 are respectively composed of a plurality of steel bars, and both ends of each steel bar are provided with threads, so as to facilitate anchoring with anchor nuts.

[0043] In this embodiment, the four corners of one end of the rectangular inner tube 10 and the rectangular outer tube 20 are provided with connecting ends 30 , and the first end cover 701 and the second end cover 702 are respectively provided with slots 703 adapted to the connecting ends 30 .

[0044] In this embodiment, the connector 80 includes a connecting plate 801 , and two sides of the connecting plate 801 are respectively connected with a connecting piece 802 and a connecting ear 803 , and the connecting piece 802 is connected to the connecting end 30 of the rectangular inner tube 10 and the rectangular outer tube 20 .

[0045] In this embodiment, the rectangular inner tube 10, the rectangular outer tube 20, the first end cover 701 and the second end cover 702 are made of Q355B steel, and the energy dissipation core plate 40 is made of Q235B steel, LY100, LY160 and LY225.

[0046] The controllability analysis of the initial stiffness of the support device proposed in the present invention is as follows:

[0047] Assume that the axial elastic stiffness of the supporting rectangular inner tube 10, the rectangular outer tube 20, the energy dissipation core plate 40, the first prestressing group 6051 and the second prestressing group 6052 are K i , K o , K c1 , K r1 and K r2 ; The initial stiffness and stiffness after reaching the preload of disc spring combination 601 are K ds1 and K ds2 .

[0048] Since the assembled self-resetting buckling restraint support proposed in the utility model only applies pre-stress to the disc spring assembly 601, and does not apply pre-tension to the first pre-stress group 6051 and the second pre-stress group 6052, the initial stiffness K of the reset system is s1 is the series stiffness of the first prestressing group 6051 and the second prestressing group 6052, that is,

[0049] K s1 =1 / (1 / K r1 +1 / Kr2 +1 / K ds1 )≈1 / (1 / K r1 +1 / K r2 )

[0050] K s1 Usually less than the initial stiffness K of the energy dissipation core plate 40 c1 The smaller theoretical initial stiffness of the reset device reduces its sensitivity to component processing errors.

[0051] If the first prestressing group 6051 and the second prestressing group 6052 of the support apply the same prestressing force as the disc spring combination 601, the working mechanism of the initial force-bearing stage of the support reset device is the same as that of the existing self-reset buckling restrained support based on post-tensioned prestressed tendons. At this time, the initial stiffness K' of the reset system s1 for

[0052] K' s1 =K i +K o +1 / (1 / K r1 +1 / K r2 )

[0053] It can be seen that K' s1 The axial stiffness is controlled by the rectangular inner tube 10 and the rectangular outer tube 20. Since the cross-sectional area of ​​the energy dissipation core plate 40 is usually much smaller than the rectangular inner tube 10 and the rectangular outer tube 20, K' s1 >>K c1 , the theoretical initial stiffness of the reset device is too high, which will be very sensitive to the processing errors of the components.

[0054] In addition, the rectangular inner tube 10 and the rectangular outer tube 20 are not only the force transmission components of the reset device, but also the constraint components of the energy-consuming core plate 40. Therefore, they need to meet the requirements of overall stability and local stability. The cross-sectional dimensions of the rectangular inner tube 10 and the rectangular outer tube 20 cannot be flexibly adjusted, resulting in the initial stiffness of the reset device being difficult to adjust. However, the initial stiffness of the reset device of the self-resetting buckling restraint support proposed in the utility model is not controlled by the rectangular inner tube 10 and the rectangular outer tube 20, but mainly depends on the first prestressed group 6051 and the second prestressed group 6052. Therefore, the initial stiffness of the reset device can be adjusted by changing the cross-sectional area of ​​the first prestressed group 6051 and the second prestressed group 6052.

[0055] The above embodiments are only for illustrating the technical concept and features of the utility model, and their purpose is to enable those skilled in the art to understand the content of the utility model and implement it, and they cannot be used to limit the protection scope of the utility model. Any equivalent changes or modifications made according to the spirit of the utility model should be included in the protection scope of the utility model.

Claims

1. An assembled self-resetting buckling restraint support device with controllable initial stiffness, characterized in that: It comprises a rectangular inner tube, a rectangular outer tube is disposed outside the rectangular inner tube, and the connecting ends of the rectangular inner tube and the rectangular outer tube are respectively connected with connectors, and further comprises: An energy-absorbing core plate, which is L-shaped so that the energy-absorbing core plate can be installed at the four corners between the rectangular inner tube and the rectangular outer tube, one end of the energy-absorbing core plate is connected to the connecting end of the rectangular inner tube, and the other end of the energy-absorbing core plate is connected to the connecting end of the rectangular outer tube; Guide plates, the guide plates are respectively arranged on four surfaces of the rectangular inner tube, and the thickness of the guide plates is greater than the thickness of the energy-absorbing core plate, but the thickness of the guide plates is less than the distance between the rectangular inner tube and the rectangular outer tube; and, A reset device is arranged inside the rectangular inner tube, and the reset device includes a disc spring device, and the two ends of the disc spring device are respectively connected to a first prestressed group and a second prestressed group, and the first prestressed group and the second prestressed group are respectively connected to a first end cover and a second end cover, and the first end cover and the second end cover are respectively locked to the rectangular inner tube and the rectangular outer tube by relying on the prestress of the first prestressed group and the second prestressed group.

2. The support device according to claim 1, characterized in that: The energy-absorbing core plate comprises a yielding section, and connecting sections are respectively arranged at both ends of the yielding section. The cross-sectional area of ​​the connecting section is larger than that of the yielding section, and the two connecting sections are respectively connected to the connecting ends of the rectangular inner tube and the rectangular outer tube.

3. The supporting device according to claim 2, characterized in that: A transition section with a gradually increasing cross-sectional area between the yield section and the connecting section.

4. The supporting device according to claim 2, characterized in that: The surface of the yield section is provided with a non-bonding material to reduce the friction between the yield section and the rectangular inner tube and the rectangular outer tube.

5. The supporting device according to claim 2, characterized in that: The connecting section is provided with connecting holes staggered with each other to reduce the weakening of the cross section of the connecting section.

6. The supporting device according to claim 1, characterized in that: The disc spring device includes a disc spring assembly, a conduit, a disc spring baffle and a fixing bolt, wherein: the disc spring assembly is composed of a single disc spring through overlapping and matching, the disc spring baffle is provided with circular holes along the periphery so that the first prestress group and the second prestress group can pass through, the conduit is passed through the disc spring assembly and the disc spring baffle, so that the disc spring assembly can only produce axial deformation along the conduit, and the conduit has threads at both ends to facilitate the screwing of the fixing bolt.

7. The supporting device according to claim 6, characterized in that: One end of the first prestressed group is connected to the first end cover, and the other end of the first prestressed group is connected to the disc spring baffle away from the first end cover; one end of the second prestressed group is connected to the second end cover, and the other end of the second prestressed group is connected to the disc spring baffle away from the second end cover.

8. The supporting device according to claim 6, characterized in that: The first prestressing group and the second prestressing group are respectively composed of a plurality of steel bars, and threads are arranged at both ends of each of the steel bars, so as to facilitate anchoring with anchor nuts.

9. The supporting device according to claim 1, characterized in that: The connecting ends are arranged at four corners of one end of the rectangular inner tube and the rectangular outer tube, and the first end cover and the second end cover are respectively provided with slots adapted to the connecting ends.

10. The supporting device according to claim 1, characterized in that: The connector comprises a connecting plate, and two sides of the connecting plate are respectively connected with connecting pieces and connecting ears, and the connecting pieces are connected to the connecting ends of the rectangular inner tube and the rectangular outer tube.

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