CN-115710988-B - Deformation-controlled corner brace with external metal energy dissipater

CN115710988BCN 115710988 BCN115710988 BCN 115710988BCN-115710988-B

Abstract

The invention discloses a deformation-controlled knee brace with an external metal energy absorber, which comprises an inner metal rod, an outer metal tube, a standby pull rod system, a connecting plate, a pressed elastic cushion block and the external metal energy absorber. The inner metal rod is inserted into the outer metal tube and connected with the spare pull rod system inside the outer metal tube, and the outer metal energy dissipater is used for connection. The bottom end of the inner part of the outer metal pipe is provided with a pressed elastic cushion block. The standby pull rod system limits the maximum stretching deformation of the inner metal rod relative to the outer metal pipe, and the impact action of the inner metal rod on the outer metal pipe is reduced by the pressed elastic cushion block. The invention has the beneficial effects that when the structure bears the design and expects the internal earthquake action, the invention can utilize the plastic deformation of the external metal energy dissipater to dissipate the earthquake energy, and when the structure bears the large earthquake action and the structure deformation is larger, the corner brace can be degenerated into a stressed support to limit the maximum deformation of the structure, thereby being beneficial to improving the side rigidity of the structure and the collapse resistance.

Inventors

LI GUOQIANG
ZHONG YUNLONG
XIANG YANG

Assignees

同济大学

Dates

Publication Date: 20260508
Application Date: 20221107

Claims (8)

1. The deformation-controlled knee brace with the external metal energy dissipater comprises an inner metal rod (1), an outer metal tube (2) and the external metal energy dissipater (3), wherein the inner metal rod (1) is inserted into the outer metal tube (2), the external metal energy dissipater (3) comprises an inner energy dissipation rod (31), an outer constraint sleeve (32) and a gap filling tube (33), and the inner energy dissipation rod (31) passes through the outer constraint sleeve (32) after wrapping the gap filling tube (33), and is characterized in that: The device also comprises a standby pull rod system (4), a pressed elastic cushion block (5) and a connecting plate (6), wherein the inner metal rod (1) is connected with the inner space of the outer metal pipe (2) through the standby pull rod system (4), the pressed elastic cushion block (5) is fixed at the bottom of the inner cavity of the outer metal pipe (2), and the inner metal rod (1) is connected with the outer metal pipe (2) at least through two opposite outer surfaces outside through an external metal energy absorber (3); The main body of the outer metal pipe (2) is a rectangular steel pipe (21), one end of the outer metal pipe is provided with a main connecting end head (22) and a main connecting end plate (23), the other end of the outer metal pipe is in an opening state, and main stiffening plates (24) are arranged on at least two opposite outer surfaces of the rectangular steel pipe (21); the standby pull rod system (4) comprises a nut fastener (7), a rigid pull rod (41) and an elastic component (42), and the standby pull rod system (4) is used for connecting the main connecting end plate (23) and the connecting plate (6).
2. A deformation-controlled corner brace with an external metal energy absorber as defined in claim 1, wherein: The inner metal rod (1) is characterized in that a main body of the inner metal rod (1) is a metal rod main body (11), one end of the inner metal rod is provided with a secondary connection end head (12) and a secondary connection end plate (13), the other end of the inner metal rod is provided with a sealing end plate (15), at least two opposite outer surfaces of the metal rod main body (11) are provided with secondary stiffening plates (14), the connecting plate (6) is fixedly connected with the metal rod main body (11), and the section of the metal rod main body (11) is rectangular in the length interval from the connecting plate (6) to the sealing end plate (15).
3. A deformation-controlled corner brace with an external metal energy absorber as defined in claim 1, wherein: The section size of the metal rod main body (11) of the inner metal rod (1) is smaller than the section size of the inner cavity of the rectangular steel tube (21) of the outer metal tube (2), and one end of the metal rod main body (11) with the sealing end plate (15) is inserted into the outer metal tube (2).
4. The deformation-controlled knee brace with the external metal energy absorber according to claim 1, wherein the main body of the inner metal rod (1) is a metal rod main body (11), and the connecting plate (6) is fixedly connected with the metal rod main body (11) and can be set at the position of the metal rod main body (11) according to requirements.
5. The deformation-controlled knee brace with an external metal energy absorber according to claim 1, wherein the elastic cushion block (5) consists of a compression end plate (51), an elastic body (52) and a metal guide rod (53) and is connected with the main connecting end plate (23) through a nut fastener (7).
6. The deformation-controlled knee brace with an external metal energy absorber according to claim 1, wherein the external metal energy absorber (3) is connected with the secondary stiffening plate (14) and the primary stiffening plate (24) through large nuts (34), and at least one of the secondary stiffening plate (14) and the primary stiffening plate (24) is provided with a U-shaped notch.
7. A deformation-controlled corner brace with an external metal energy absorber according to any of claims 1 to 6, wherein: the length of the spare tie rod system (4) is greater than the maximum surface distance of the main connecting end plate (23) and the connecting plate (6), has a redundant length, and the redundant length is filled by an elastic member (42).
8. The deformation-controlled corner brace with an external metal energy absorber of claim 7, wherein: The working mechanism comprises: Firstly, under the action of an earthquake, when the structural system is deformed to lead the corner brace to be pulled, the inner metal rod (1) is separated from the outer metal pipe (2), and the external metal energy absorber (3) is stretched and deformed, so that the energy consumption state of yielding is achieved, and the earthquake energy is consumed; when the tensile deformation of the knee brace does not exceed the reserved distance y1, the elastic component (42) is subjected to compression deformation, the rigidity is small, the spare pull rod system (4) is stressed little, the external load is borne by the external metal energy dissipater (3), the mechanical property of the knee brace is the same as that of the external metal energy dissipater (3), the internal force generated by the compression of the elastic component (42) is transmitted to the inner metal rod (1) and the external metal tube (2) through the rigid pull rod (41), the pressure increasing effect of the external metal energy dissipater (3) is compensated, when the tensile deformation of the knee brace is continuously increased and exceeds the reserved distance y1, the elastic component (42) is completely compressed and cannot be further deformed, the length of the elastic component is changed from the original length l0 to l1, the separation motion of the inner metal rod (1) relative to the external metal tube (2) is limited by the inherent length of the rigid pull rod (41), and the rigidity and the bearing force of the rigid pull rod (41) are both increased because the rigidity and the bearing force of the rigid pull rod (41) are larger, the tension of the rigid pull rod (41) begins to partially bear the tension force, and the rigidity and the bearing force of the knee brace is improved. When the earthquake action born by the structure is further increased, the compression deformation of the inner metal rod (1) relative to the outer metal tube (2) exceeds a reserved value y2, the inner cavity of the outer metal tube (2) disappears, the sealing end plate (15) is in contact with the compression elastic cushion block (5), the compression deformation control mechanism consisting of the inner metal rod (1), the compression elastic cushion block (5) and the main connecting end plate (23) is formed due to the fact that the bearing capacity and rigidity of the compression elastic cushion block (5) are large, the compression deformation of the corner brace is controlled, the external metal energy absorber (3) is effectively protected, meanwhile, the compression bearing capacity and rigidity of the compression elastic cushion block (5) are improved, the collapse resistance of the structure is improved, the compression deformation control mechanism of the guide rod (51) can be controlled along the compression deformation control direction of the tension elastic cushion block (5), the compression deformation of the guide rod (5) is balanced, and the compression deformation control mechanism of the guide rod (53) can be further controlled along the compression deformation control direction of the tension elastic cushion block (5), and the compression deformation of the compression elastic cushion block (5) is balanced, and the compression deformation of the compression elastic cushion block (2) is further reduced.

Description

Deformation-controlled corner brace with external metal energy dissipater Technical Field The invention belongs to the technical field of civil structure engineering, and particularly relates to a deformation-controlled knee brace with an external metal energy absorber. Technical Field The building structure needs to bear horizontal effects such as earthquake effect and wind load besides bearing gravity load, so that the building structure needs to have enough lateral rigidity resistance. The frame structure relies on beam-column node bending resistance to provide lateral resistance to the structure, which is often limited in stiffness, and thus the lateral stiffness of the structure is typically improved by arranging supports in the structural system. The central support-frame structure has high lateral rigidity, but is easy to generate compressive instability under earthquake, the anti-seismic performance of the structure under strong earthquake is difficult to ensure, the central support frame limits the deformation of a structural system, the plastic deformation energy of the beam column member cannot be exerted, the anti-seismic performance of the structure is unfavorable, and therefore the buckling restrained brace is developed. The buckling restrained brace avoids the phenomenon of compressive instability of the common brace, has approximately the same tensile and compressive properties, and can stably exert the energy consumption capability under the action of earthquake. Besides, scholars propose an eccentric support frame and a corner support-frame structure system, and the structure system organically combines the rigidity advantage of the central support-frame structure system and the deformation advantage of the frame system in a bias support mode, has good economical efficiency, and has wide application prospect in a multi-high-rise steel structure system. Generally, the buckling restrained brace has high bearing capacity, cannot consume energy in small earthquake, has large size, is inconvenient to construct and install, occupies building space, can influence normal use functions of a building to a certain extent when applied to an engineering structure, can increase structural rigidity, improves earthquake action and acceleration response of the structure, and is limited in application in the engineering structure with precise instruments. Along with the continuous development of toughness anti-seismic design, the repairability of building structures after earthquake is also more and more concerned, and the buckling restrained brace is not feasible to repair because the pressed core rod is wrapped, and the whole brace needs to be replaced after earthquake, so that the economy is poor. In recent years, small metal energy absorbers having small size and small bearing capacity have been proposed, and these energy absorbers are mainly disposed in the node connection areas. Because the bearing capacity is small, the energy dissipaters can consume energy under small earthquake, the structural rigidity is not greatly improved, and the energy dissipaters are easy to repair after the earthquake. However, as the small metal energy dissipater enters a yielding state earlier, the plastic development degree of the structure energy dissipater is high under a large shock, on one hand, the small metal energy dissipater may break earlier due to overlarge deformation, on the other hand, the small metal energy dissipater has smaller rigidity in a deep plastic stage, and the effective lateral rigidity of the structure system cannot be improved, so that the structure is damaged by a weak layer and collapses even under the gravity second-order effect. Disclosure of Invention The invention aims to provide an energy dissipation corner brace which can be used in a corner brace-frame structure, and the corner brace has the advantages of simple structure, easy post-earthquake repair and controllable deformation, so as to solve the problems of difficult post-earthquake repair and unreliable large earthquake performance of the traditional small damper of the buckling restrained brace in the technical background. Therefore, the deformation-controlled corner brace with the external metal energy dissipater is mainly applied to a corner brace-frame structure system, increases the rigidity and energy consumption capacity of frame nodes, can consume energy immediately under small earthquake, reduces earthquake damage of the structure, is simple to repair after the corner brace is in earthquake, and has the advantages of low manufacturing cost and convenience in replacement after the earthquake. In order to achieve the above purpose, the deformation-controlled knee brace with the external metal energy dissipater provided by the invention comprises an inner metal rod, an outer metal pipe and the external metal energy dissipater, wherein the inner metal rod is inserted into the outer metal pipe, the external metal energy dissipa