A double half-wave bending type buckling restrained damper

Abstract

This invention discloses a double-half-wave bending buckling-restrained damper, belonging to the field of structural vibration reduction technology. The main body includes a restraint unit, a double-half-wave energy dissipation unit, and a connecting unit. By selecting limiting steel blocks of different heights to adjust the distance between the upper and lower restraint steel plates, it can be adapted to different half-wave steel plate radii; the larger the radius of the half-wave steel plate, the stronger its deformation capacity. During the stress process, the double-half-wave energy dissipation unit is constrained by bolts, the upper and lower restraint steel plates, and spacer retaining material, and develops second-order yield. This invention provides reliable force transmission under strong earthquakes and strong aftershocks, exhibits good low-cycle fatigue performance, can undergo large deformation under seismic action, thereby dissipating greater energy, and is easy to disassemble after a strong earthquake, facilitating rapid repair of the main structure.

Description

Technical Field

[0001] The invention relates to the field of structural vibration reduction in civil engineering, and in particular to a double half-wave bending type buckling restrained damper. Background Art

[0002] Earthquake is one of the main natural disasters that threaten the safety of major engineering structures. Therefore, structural seismic control has become an effective measure for disaster prevention and mitigation in civil engineering.

[0003] With the development of my country's economy and the increasing innovation in various industries, structural earthquake prevention and disaster reduction technology has developed rapidly, from the traditional reliance on structural component damage to resist adverse external loads and foundation isolation measures, to passive energy dissipation and shock absorption technology and active, semi-active and intelligent control technology. The structure can improve its lateral stiffness after being arranged with ordinary supports, but under the action of strong earthquakes, the supports will enter the buckling state prematurely, resulting in damage and cannot play the role of consuming earthquake energy. In this context, a new type of support came into being, namely the buckling-restrained brace (BRB). Its inner core plate, which plays an energy dissipation role, is restricted by the restraining steel plate, effectively avoiding buckling damage and making full use of the strength of steel.

[0004] The BRB energy-absorbing component consists of a sleeve, a core plate, and a filler material between the sleeve and the core plate that acts as a lubricant. After the BRB yields, its stiffness increases very little, and during an earthquake, the BRBs on all floors of the building cannot yield at the same time, resulting in deformation and damage concentrated between layers. Moreover, the building structure may experience several strong earthquakes and strong aftershocks during its life cycle, which often causes the BRB to be damaged due to insufficient low-cycle fatigue performance. In addition, since aftershocks often occur shortly after the main earthquake, according to earthquake damage surveys, the magnitude of aftershocks is often close to that of the main earthquake. When a destructive aftershock occurs, earthquake relief activities may have just begun. At this time, there is no manpower, material resources, or time to replace the damaged supports, so the aftershocks will cause greater damage.

[0005] The widely used BRB energy-absorbing component sleeve is a rectangular frame made of high-strength steel. The core plate is mainly divided into two types: straight-line and cross-shaped. The straight-line type has only one-dimensional stiffness and is prone to buckling; the cross-shaped type is welded from two angle steels, which is prone to stress concentration and damage at the welding point; the ordinary flat-plate BRB energy-absorbing component has a small deformation, and the flat plate is easily broken under large deformation; under the repeated action of aftershocks, ordinary BRB energy-absorbing components are prone to fatigue damage. Summary of the invention

[0006] In order to solve the technical problems that the ordinary buckling restrained support has small deformation and is not suitable for large deformation, and has poor fatigue performance, the present invention provides a double half-wave bending buckling restrained damper that is easy to install and inexpensive during construction. It has excellent low-cycle fatigue performance under strong earthquake aftershocks, is easy to disassemble and replace after a strong earthquake, and is easy to realize the rapid repair of the main structure, thereby improving the rapid recovery function of the main structure after an earthquake.

[0007] The technical solution adopted by the present invention to solve the above technical problems is: a double half-wave bending type buckling restrained damper is composed of a constraint unit, a double half-wave energy dissipation unit and a connecting unit, and the constraint unit, the double half-wave energy dissipation unit and the connecting unit are all made of Q235 or Q345 steel.

[0008] The constraint unit consists of an upper constraint steel plate, a lower constraint steel plate, a side steel plate and a limit steel block. The limit steel block is used to maintain the distance between the two constraint steel plates, that is, the limit steel block is placed between the two constraint steel plates and connected with the upper constraint steel plate and the lower constraint steel plate by bolts. The distance between the upper and lower constraint steel plates can be adjusted by selecting limit steel blocks of different heights to adapt to different half-wave steel plate radii. The larger the radius of the half-wave steel plate, the stronger its deformation ability.

[0009] The double half-wave energy dissipation unit is composed of two identical upper and lower half-wave energy dissipation core plates. The half-wave energy dissipation core plate and the connection unit are integrated and made by mechanical pressing. This structure can avoid the occurrence of large expansion and contraction and local stress concentration, improve the repeated deformation ability of the half-wave energy dissipation core plate, and have good ductility; before processing the half-wave steel plate, the flat steel plate is heated and maintained at a maximum temperature of 300°C for a total of 10 minutes. A circular mold is used to quickly cold press to form a half-wave. After cold pressing, it is corrected and then annealed. This can effectively prevent the steel from becoming brittle due to stress concentration after the half-wave shape of the flat steel plate is quickly cold-pressed.

[0010] The middle part of this processed plate is called the half-wave energy dissipation core plate, and the two ends are called connection units. The half-wave energy dissipation core plate is composed of several half-wave steel plates and horizontal steel plates. Part of the steel plates at both ends of the half-wave energy dissipation core plate are reserved as connection units, which are connected to the external structure through bolts, so that the double half-wave bending buckling restrained damper can be replaced after energy dissipation damage to protect the main structure again. Stiffening ribs are provided on the connection unit to prevent the connection unit from being unstable and damaged under the action of a large earthquake.

[0011] The upper and lower half-wave energy dissipation core plates are assembled to form a circular shape. The diameter of the spacer is smaller than the diameter of the circular shape, and it is arranged in these circular shapes. The limit slider on the spacer passes through the horizontal guide groove of the side steel plate. The number of horizontal guide grooves is consistent with the number of half-wave steel plates, so that the spacer maintains a spacing between the half-wave steel plate in the circular gap, and the spacing size can be 6mm, 9mm or 12mm. When not under force, the spacer can slide freely in the circular shape, but when the double half-wave bending buckling restrained damper is stretched or compressed by external force, the half-wave steel plate in the half-wave energy dissipation core plate is stretched or compressed, and the circular shape is stretched or compressed. The spacer contacts the half-wave steel plate, so the circular shape is no longer deformed, and other circular shapes that are not stretched or compressed can still participate in the stretching or compression deformation. The spacer plays a role in preventing deformation from being concentrated in the same circular shape, effectively avoiding the premature destruction of the circular shape due to concentrated large deformation. Therefore, all half waves of the double half-wave energy dissipation unit participate in bending deformation, so that the double half-wave bending buckling restrained damper produces large deformation energy dissipation. The radius of the half-wave steel plate is the same, the length of the horizontal steel plate is also the same, the radius of the half-wave steel plate can be 40mm, 50mm, 60mm or 70mm, and the length of the horizontal steel plate can be 30mm, 40mm, 50mm or 60mm. By changing the radius, thickness and length of the steel plate, a parameter-controllable half-wave energy dissipation core plate is formed.

[0012] The half-wave energy dissipation core plate is connected to the upper constraint steel plate and the lower constraint steel plate through a fixed screw to prevent the constraint steel plate and the energy dissipation unit from relative slipping when stationary. The middle part of the fixed screw is screwed, and the upper and lower half-wave energy dissipation core plates are fixed by double nuts. The screws are screwed at both ends of the fixed screw, and the gap between the half-wave steel plate and the upper and lower constraint steel plates is maintained by double nuts. The size of the gap can be 2mm, 5mm, 8mm or 10mm. This is to ensure that the wave apex of the half-wave steel plate moves toward the constraint steel plate during the compression of the double half-wave energy dissipation unit, and is restrained by the constraint steel plate and develops second-order yield. The upper and lower half-wave energy dissipation core plates are opened at the horizontal steel plate to penetrate the limit slide bar. The limit slide bar should be arranged on the horizontal steel plate except for the horizontal steel plate where the fixed screw is arranged. The middle part of the limit slide bar is screwed, and the upper and lower half-wave energy dissipation core plates are fixed with double nuts. The limit slide rod passes through the horizontal slide grooves opened on the upper constraint steel plate and the lower constraint steel plate. The number of horizontal slide grooves is one less than the number of half-wave steel plates. The limit slide rod moves in the horizontal slide groove to ensure that the half-wave energy-absorbing core plate of the damper can move in the horizontal direction to prevent instability and damage.

[0013] The inner surfaces of the upper and lower constraint steel plates are provided with a non-adhesive Teflon coating, and the outer surface of the half-wave steel plate is also provided with a non-adhesive Teflon coating, in order to eliminate the influence of contact friction with the constraint steel plate when the double half-wave energy dissipation unit yields.

[0014] When the double half-wave bending buckling restrained damper is compressed, the half-wave steel plate of the double half-wave energy dissipation unit near the moving end is compressed and deformed at the horizontal partition, and the upper crest and lower trough of the wave are deformed toward the adjacent restraining steel plate at the same time. As the compressive displacement continues to increase, the upper crest of the wave contacts the upper restraining steel plate and is restrained by the upper restraining steel plate. At this time, the stress of the upper crest and lower trough of the half-wave steel plate is large, and the stress at the horizontal partition is also large. As the compressive deformation continues to increase, the top of the lower trough of the half-wave steel plate wave also contacts the lower restraining steel plate and is restrained by the lower restraining steel plate. At this time, the stress of the upper crest, lower trough and horizontal partition of the half-wave steel plate is greater than the previous state, indicating that it consumes more energy. During this period, the stress of the corrugated steel plate of the upper half wave near the horizontal partition is greater than that of the corrugated steel plate of the lower half wave, which is caused by the restraining effect of the upper restraining steel plate first. As the compressive deformation continues to increase, the half-wave steel plate contacts the spacing material at the horizontal partition of the waveform. Since the upper and lower tops are restrained by the upper and lower restraining steel plates respectively, the stress of the upper and lower half-wave steel plates of the half-wave steel plate is greater than the previous state within the entire cross-section, which means that the range of parts involved in energy consumption has increased. However, the stress level of the parts restrained by the upper and lower restraining steel plates is reduced due to the full cross-section participating in the deformation. Finally, the single wave contacts the spacing material at two points at the horizontal partition, and the pressure is mainly transmitted through the spacing material. The single wave no longer continues to deform, resulting in a large deformation of the next waveform until the wave also contacts the spacing material, and the deformation is transmitted to the next wave.

[0015] When the double half-wave bending buckling restrained damper is under tension, the wave of the half-wave steel plate of the double half-wave energy dissipation unit undergoes tensile deformation at the horizontal diaphragm, and the circular cross-section gradually changes into a flat "fish mouth" shape as the deformation develops. The single wave gradually deforms toward the spacing material, and the upper crest and lower trough of the wave deform toward the adjacent upper and lower restraining steel plates at the same time. During the tension process, the stress of the upper crest and lower trough of the single wave is relatively large, and the stress at the horizontal diaphragm is also relatively large. With the development of tensile deformation, the inner wall of the upper half wave of the single wave contacts the spacing material and is constrained by the spacing material, so the deformation stops at this place, causing the lower half wave to undergo greater deformation. With the continued development of tensile deformation, the inner wall of the lower half wave of the single wave contacts the spacing material and is also constrained by the spacing material. Due to the support of the spacing material, the half-wave steel plate no longer deforms, resulting in a large deformation of the next waveform, until the wave also contacts the spacing material, and the deformation is transmitted to the next wave.

[0016] Compared with the prior art, the advantages of the present invention are: (1) the energy-absorbing core plate of a double half-wave bending type buckling restrained damper is double half-wave, which makes the device have good parameter controllability and hysteresis energy absorption capacity; (2) the connection between a double half-wave bending type buckling restrained damper and the main structure is also changed from the original welding to bolt connection, so that the energy-absorbing component can be replaced after energy-absorbing damage, re-protecting the main structure, speeding up construction and shortening the construction period. (3) The half-wave energy-absorbing core plate of a double half-wave bending type buckling restrained damper is supported by steel and can be recycled after failure and damage; the constraint steel plate and the limit steel block can be reused after the double half-wave energy-absorbing unit is damaged, which is more energy-saving and material-saving. (4) By changing the number of half waves in the half-wave energy-absorbing core plate, the thickness of the half-wave steel plate and the distance of the horizontal steel plate, the parameters of the double half-wave buckling restrained damper can be controlled to make it meet various energy-absorbing requirements. Therefore, the shock-absorbing energy-absorbing device of the present invention has the advantages of controllable parameters, excellent performance, low price and relatively simple structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the embodiments of the present invention 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 in the following description are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0018] Figure 1 It is a schematic diagram of the structure of a double half-wave bending type buckling restrained damper;

[0019] Figure 2 It is a schematic diagram of the assembly of a double half-wave bending type buckling restrained damper;

[0020] Figure 3 It is the top view of the double half-wave bending type buckling restrained damper;

[0021] Figure 4 It is the cross-section diagram of the double half-wave bending type buckling restrained damper;

[0022] Figure 5 It is a schematic diagram of the structure of the restrained steel plate in the double half-wave bending type buckling restrained damper;

[0023] Figure 6 It is the top view of the restrained steel plate in the double half-wave bending type buckling restrained damper;

[0024] Figure 7 It is a schematic diagram of the structure of the spacer retaining material in the double half-wave bending buckling restrained damper;

[0025] Figure 8It is a top view of the spacer retaining material in the double half-wave bending type buckling restrained damper;

[0026] Fig. 9 It is a cross-sectional view of the intermediate retaining material of the double half-wave bending type buckling restrained damper;

[0027] Fig.10 It is a schematic diagram of the structure of the half-wave energy dissipation core plate in the double half-wave bending buckling restrained damper;

[0028] Fig.11 It is a cross-sectional view of the half-wave energy dissipation core plate in the double half-wave bending type buckling restrained damper;

[0029] Fig.12 It is a schematic diagram of the side steel plate structure of the double half-wave bending type buckling restrained damper;

[0030] Fig.13 This is the cross-section of the side steel plate of the double half-wave bending buckling restrained damper.

[0031] Among them: 1. Upper constraint steel plate, 2. Horizontal slide groove, 3. Bolts, 4. Stiffening ribs, 5. Connection unit, 6. Horizontal guide groove, 7. Side steel plate, 8. Limiting steel block, 9. Horizontal steel plate, 10. Lower constraint steel plate, 11. Spacer retaining material, 12. Half-wave steel plate, 13. Limiting slider, 14. Limiting slide rod, 15. Spacing, 16. Fixing screw, 17. Gap. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solutions and advantages of the present invention more clearly understood, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments.

[0033] like Figures 1 to 3 As shown, a double half-wave bending type buckling restrained damper is mainly composed of a restraint unit, a double half-wave energy dissipation unit and a connection unit. The restraint unit is composed of an upper restraint steel plate 1, a lower restraint steel plate 10, a side steel plate 7 and a limit steel block 8; the double half-wave energy dissipation unit is composed of two identical upper and lower half-wave energy dissipation core plates, and the half-wave energy dissipation core plate is composed of a plurality of half-wave steel plates 12 and a horizontal steel plate 9; the spacing material 11 is arranged in the circular gap of the double half-wave energy dissipation unit, and the limit slider 13 on the spacing material 11 passes through the horizontal guide groove 6 of the side steel plate, so that the spacing material 11 maintains a spacing 15 between the half-wave steel plate 12 in the circular gap, and the limit slider 13 moves in the horizontal guide groove 6, ensuring that the damper half-wave energy dissipation core plate can move in the horizontal direction to prevent instability and damage. In view of the small deformation and insufficient low-cycle fatigue performance of various BRB dampers in the prior art, the present invention provides a double half-wave bending type buckling restrained damper, and the construction steps are as follows:

[0034] (1) Select one of Q235 or Q345 steel materials for mechanical pressing of a half-wave energy-consuming core plate, heat the flat steel plate, keep the maximum temperature at 300° C. for 10 minutes, use a circular mold to quickly cold press to form a half-wave, perform correction after cold pressing, and then anneal the half-wave steel plate 12;

[0035] (2) Assemble the upper and lower identical half-wave energy dissipation core plates relative to each other, make holes in the horizontal steel plate 9 to insert the limit slide rod 14 and the fixing screw 16, tighten the limit slide rod 14 and the fixing screw 16 in the middle, and fix the upper and lower half-wave energy dissipation core plates with double nuts;

[0036] (3) The stiffening rib 4 is welded to the connection unit 5;

[0037] (4) The upper restraining steel plate 1 and the lower restraining steel plate 10 are provided with a horizontal slide groove 2;

[0038] (5) The outer surface of the half-wave steel plate 12 of the half-wave energy dissipation core plate is coated with a Teflon coating; the inner surfaces of the upper constraint steel plate 1 and the lower constraint steel plate 10 are coated with a Teflon coating;

[0039] (6) The upper constraint steel plate 1, the lower constraint steel plate 10 and the half-wave energy dissipation core plate are connected at the horizontal steel plate 9 by a fixing screw 16, and screws are twisted at both ends of the fixing screw 16;

[0040] (7) The limiting slider 13 on the spacer holding material 11 is welded to the central axis of the spacer holding material 11; the side steel plate 7 is provided with a horizontal guide groove 6; the spacer holding material 11 is arranged in the circular gap of the double half-wave energy dissipation unit, and the limiting slider 13 on the spacer holding material 11 passes through the horizontal guide groove 6 on the side steel plate 7;

[0041] (8) The limiting steel block 8 on the side steel plate 7 is connected to the upper restraining steel plate 1 and the lower restraining steel plate 10 by bolts 3;

[0042] (9) The connection unit 5 is connected to the external structure by bolts.

[0043] When the double half-wave bending type buckling restrained damper according to the present invention is working, the limit slide rod 14 will move back and forth in the horizontal slide groove 2, and the limit slide block 13 will move back and forth in the horizontal guide groove 6, ensuring that the double half-wave energy absorption unit of the damper can move in the horizontal direction to prevent instability and damage; the half-wave steel plate 12 will be constrained by the upper constraint steel plate 1, the lower constraint steel plate 10 and the spacing retaining material 11, so that all half waves of the double half-wave energy absorption unit are involved in bending deformation, generating energy consumption, thereby achieving the effect of anti-seismic and drag reduction.

[0044] Those skilled in the art will easily understand that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. All other embodiments obtained by those of ordinary skill in the art without creative work are within the scope of protection of the present invention.

Claims

1. A double half-wave bending type buckling restrained damper, characterized in that: The invention comprises a constraint unit, a double half-wave energy dissipation unit and a connection unit (5); the constraint unit is composed of an upper constraint steel plate (1), a lower constraint steel plate (10), a side steel plate (7) and a limit steel block (8); the double half-wave energy dissipation unit is composed of an upper and a lower identical half-wave energy dissipation core plate which are relatively assembled, the half-wave energy dissipation core plate is composed of a plurality of half-wave steel plates (12) and a horizontal steel plate (9), a portion of the steel plate is reserved at both ends of the half-wave energy dissipation core plate as a connection unit (5), the upper and lower half-wave energy dissipation core plates are assembled to form a circular shape of the half-wave steel plates (12); a spacer holding material (11) is arranged in the circular gap of the double half-wave energy dissipation unit, and a limit slider (13) on the spacer holding material (11) passes through a horizontal guide groove (6) on the side steel plate (7) so that the spacer holding material (11) is arranged in the circular gap of the double half-wave energy dissipation unit, and a limit slider (13) on the spacer holding material (11) passes through a horizontal guide groove (6) on the side steel plate (7) so that the spacer holding material (11) is relatively assembled. The holding material (11) maintains a spacing (15) between the half-wave steel plate (12) in the circular gap, and the half-wave energy absorbing core plate is connected to the upper constraint steel plate (1) and the lower constraint steel plate (10) by a fixing screw (16). The fixing screw (16) is only arranged at a certain horizontal steel plate (9) in the middle. The upper and lower half-wave energy absorbing core plates are opened at the horizontal steel plate (9) to pass through the limiting slide bar (14). The middle part of the limiting slide bar (14) is screwed, and the upper and lower half-wave energy absorbing core plates are fixed with double nuts. The limiting slide bar (14) passes through the horizontal slide grooves (2) opened on the upper constraint steel plate (1) and the lower constraint steel plate (10). The upper and lower ends of the limiting steel block (8) are respectively connected to the upper constraint steel plate (1) and the lower constraint steel plate (10) by bolts (3).

2. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The connection unit (5) is integrated with the half-wave energy dissipation core plate and is located at both ends. The connection unit (5) is connected to the external structure by bolts and is provided with stiffening ribs (4).

3. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The fixing screw (16) is screwed in the middle to fix the upper and lower half-wave energy-absorbing core plates through double nuts, and the fixing screw (16) is screwed at both ends to maintain a gap (17) between the half-wave steel plate (12) and the upper constraint steel plate (1) and the lower constraint steel plate (10) through double nuts.

4. A double half-wave bending type buckling restrained damper according to claim 3, characterized in that: The size of the gap (17) can be 2mm, 5mm, 8mm or 10mm.

5. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The limiting sliding rod (14) is to be arranged on the horizontal steel plate (9) except the horizontal steel plate (9) where the fixing screw rod (16) is arranged.

6. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The number of the half-wave steel plates (12) of the half-wave energy dissipation core plate can be 4, 5, 6, 7 or 8.

7. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The number of the horizontal guide grooves (6) is consistent with the number of the half-wave steel plates (12).

8. A double half-wave bending type buckling restrained damper according to claim 6, characterized in that: The number of the horizontal chute (2) is one less than the number of the half-wave steel plates (12).

9. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The radius of the half-wave steel plate (12) can be 40 mm, 50 mm, 60 mm or 70 mm, and the length of the horizontal steel plate (9) can be 30 mm, 40 mm, 50 mm or 60 mm.

10. The double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The inner surfaces of the upper restraining steel plate (1) and the lower restraining steel plate (10) are provided with a non-adhesive Teflon coating, and the outer surface of the half-wave steel plate (12) is also provided with a non-adhesive Teflon coating.

11. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The distance (15) between the spacing material (11) and the half-wave steel plate (12) can be 6 mm, 9 mm or 12 mm.

12. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The constraint unit, the double half-wave energy dissipation unit and the connection unit (5) are made of Q235 or Q345 steel.

13. A double half-wave bending type buckling restrained damper according to claim 1, characterized in that: The half wave of the half wave steel plate (12) is formed by mechanical pressing using a circular mold.

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