CN110067426B - Anti-seismic steel structure with buckling-restrained brace - Google Patents
Anti-seismic steel structure with buckling-restrained brace Download PDFInfo
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- CN110067426B CN110067426B CN201910262193.0A CN201910262193A CN110067426B CN 110067426 B CN110067426 B CN 110067426B CN 201910262193 A CN201910262193 A CN 201910262193A CN 110067426 B CN110067426 B CN 110067426B
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
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- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04H—BUILDINGS OR LIKE STRUCTURES FOR PARTICULAR PURPOSES; SWIMMING OR SPLASH BATHS OR POOLS; MASTS; FENCING; TENTS OR CANOPIES, IN GENERAL
- E04H9/00—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate
- E04H9/02—Buildings, groups of buildings or shelters adapted to withstand or provide protection against abnormal external influences, e.g. war-like action, earthquake or extreme climate withstanding earthquake or sinking of ground
- E04H9/021—Bearing, supporting or connecting constructions specially adapted for such buildings
- E04H9/0235—Anti-seismic devices with hydraulic or pneumatic damping
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- Business, Economics & Management (AREA)
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- Environmental & Geological Engineering (AREA)
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- Structural Engineering (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention discloses an anti-seismic steel structure with buckling-restrained braces, a plurality of connecting seats are fixed on a steel beam at equal intervals along the length direction of the steel beam, a plurality of buckling-restrained brace components are respectively connected with the connecting seats and positioned below the connecting seats, each buckling-restrained brace component comprises a first buckling-restrained brace and a second buckling-restrained brace, the first buckling-restrained brace and the second buckling-restrained brace are respectively connected with the connecting seats, the first buckling-restrained brace and the second buckling-restrained brace are positioned in the same plane, acute included angles are preset on the first buckling-restrained brace and the second buckling-restrained brace, the plurality of buckling-restrained brace components are used for supporting the steel beam, the steel beam is connected with other steel structure components, when an earthquake occurs, the cores of the first buckling-restrained brace and the second buckling-restrained brace yield, the earthquake energy is consumed through hysteretic deformation, and the transmission of the earthquake energy to the steel beam is reduced, the anti-seismic effect of the whole steel structure is improved.
Description
Technical Field
The invention relates to the technical field of steel structures, in particular to an anti-seismic steel structure with buckling restrained braces.
Background
The steel construction is used as the main part commonly in modern building, the steel construction has strong shock resistance, advantages such as construction convenience, in the structure of encorbelmenting greatly, also often use the steel construction as the main part in reality, design the difficult point of encorbelmenting the structure greatly and just how ensure that the structure of encorbelmenting greatly has better antidetonation effect, current structure antidetonation effect of encorbelmenting greatly is relatively poor, buckling restrained brace is a novel shock-resistant structure, will buckle-restrained brace use must improve the anti-seismic performance of steel construction in the steel construction, consequently how to effectively combine buckling-restrained brace and steel construction, be the technical problem that needs now to solve.
Disclosure of Invention
In order to solve the technical problems in the background art, the invention provides an anti-seismic steel structure with anti-buckling supports.
The invention provides an anti-seismic steel structure with anti-buckling supports, which comprises a steel beam, a plurality of connecting seats and a plurality of anti-buckling support assemblies, wherein the steel beam is provided with a plurality of connecting holes;
the connecting seats are fixed on the steel beam at equal intervals along the length direction of the steel beam;
a plurality of buckling restrained brace subassemblies are connected with a plurality of connecting seats respectively and are located the connecting seat below, and buckling restrained brace subassembly includes first buckling restrained brace and second buckling restrained brace, and first buckling restrained brace one end is connected with the connecting seat, and second buckling restrained brace one end is connected with the connecting seat, and first buckling restrained brace and second buckling restrained brace are located the coplanar, and first buckling restrained brace and second buckling restrained brace predetermine acute angle contained angle.
Preferably, the connecting seat is provided with a first sliding cavity and a second sliding cavity;
the damping mechanism comprises a first sliding rod, a first piston, a first spring, a second spring and oil, the first sliding rod is located in the first sliding cavity and extends to the outside of the first sliding cavity to be connected with a first buckling-restrained brace, the first piston is fixed in the middle of the first sliding rod and is in sliding fit with the inner wall of the first sliding cavity, a first damping hole is formed in the first piston, the first spring is sleeved on the first sliding rod and located on the first side of the first piston, two ends of the first spring are respectively abutted against the first piston and the inner wall of the first sliding cavity, the second spring is sleeved on the first sliding rod and located on the second side of the first piston, two ends of the second spring are respectively abutted against the first piston and the inner wall of the first sliding cavity, the oil is filled in the first sliding cavity, and the first piston is located in the middle of the first sliding cavity in a free state of the damping mechanism;
the damping mechanism comprises a second sliding rod, a second piston, a third spring, a fourth spring and oil, the second sliding rod is located in a second sliding cavity and extends to the outside of the second sliding cavity to be connected with a second buckling-restrained brace, the second piston is fixed to the middle of the second sliding rod and is in sliding fit with the inner wall of the second sliding cavity, a second damping hole is formed in the second piston, the third spring is sleeved on the second sliding rod and located on the first side of the second piston, two ends of the second spring are respectively abutted against the inner wall of the second piston and the inner wall of the second sliding cavity, the fourth spring is sleeved on the second sliding rod and located on the second side of the second piston, two ends of the fourth spring are respectively abutted against the inner wall of the second piston and the inner wall of the second sliding cavity, and the oil is filled in the second sliding cavity, and the second piston is located in the middle of the second sliding cavity in a free state of the damping mechanism.
Preferably, the first slide bar is hinged with the first buckling-restrained brace, and the second slide bar is hinged with the second buckling-restrained brace.
Preferably, a third sliding cavity is formed in one side, away from the anti-buckling support assembly, of the connecting seat;
the third damping mechanism comprises a third sliding rod, a third piston, a fifth spring, a sixth spring and oil, the third sliding rod is located in the third sliding cavity and extends to the outside of the second sliding cavity, the third piston is fixed in the middle of the third sliding rod, the third piston is in sliding fit with the inner wall of the third sliding cavity, a third damping hole is formed in the third piston, the fifth spring is sleeved on the third sliding rod and located on the first side of the third piston, the two ends of the fifth spring are respectively abutted against the inner wall of the third piston and the inner wall of the third sliding cavity, the sixth spring is sleeved on the third sliding rod and located on the second side of the third piston, the two ends of the sixth spring are respectively abutted against the inner wall of the third piston and the inner wall of the third sliding cavity, the oil is filled in the third sliding cavity, and the third piston is located in the middle of the third sliding cavity under the free state of the third damping mechanism.
Preferably, the buckling restrained brace further comprises an elastic connecting piece, and two ends of the elastic connecting piece are respectively connected with the middle part of the first buckling restrained brace and the middle part of the second buckling restrained brace.
According to the anti-seismic steel structure provided with the buckling-restrained braces, the buckling-restrained brace assemblies are used for supporting the steel beam, the steel beam is connected with other steel structural members, particularly the first buckling-restrained brace and the second buckling-restrained brace in each buckling-restrained brace assembly are connected with the connecting seat, so that a supporting effect is achieved on the steel beam, the first buckling-restrained brace and the second buckling-restrained brace form an acute included angle, the structure is more stable, when an earthquake occurs, the core steel cores of the first buckling-restrained brace and the second buckling-restrained brace are buckled, and the earthquake energy is consumed through hysteretic deformation, so that the transmission of the earthquake energy to the steel beam is reduced, and the anti-seismic effect of the whole steel structure is improved.
Drawings
FIG. 1 is a schematic structural diagram of an earthquake-resistant steel structure with buckling restrained braces according to the present invention;
fig. 2 is a sectional view of the connecting socket according to the present invention.
Detailed Description
As shown in fig. 1-2, fig. 1 is a schematic structural view of an anti-seismic steel structure with buckling restrained braces according to the present invention, and fig. 2 is a sectional view of a connection seat according to the present invention.
Referring to fig. 1, the anti-seismic steel structure with the anti-buckling supports provided by the invention comprises a steel beam 1, a plurality of connecting seats 2 and a plurality of anti-buckling support assemblies;
the steel beam 1 is connected with other steel structural members, only a small section of the steel beam 1 is shown in figure 1, a plurality of connecting seats 2 are fixed on the steel beam 1 at equal intervals along the length direction of the steel beam 1, and only two connecting seats 2 are shown in figure 1;
the buckling-restrained brace assemblies are respectively connected with the connecting seats 2 and are positioned below the connecting seats 2, the buckling-restrained brace assemblies are used for supporting the steel beam 1, each buckling-restrained brace assembly comprises a first buckling-restrained brace 31 and a second buckling-restrained brace 32, one end of each first buckling-restrained brace 31 is connected with the connecting seat 2, one end of each second buckling-restrained brace 32 is connected with the connecting seat 2, the first buckling-restrained brace 31 and the second buckling-restrained brace 32 are positioned in the same plane, and each first buckling-restrained brace 31 and each second buckling-restrained brace 32 are preset with an acute included angle, so that the structure is more stable, the specific structures of the first buckling-restrained brace 31 and each second buckling-restrained brace 32 are the prior art, when an earthquake occurs, the steel cores of the first buckling-restrained brace 31 and each second buckling brace 32 are buckled, energy is consumed through hysteretic deformation, and accordingly the transmission of the earthquake energy to the steel beam 1 is reduced, the anti-seismic effect of the whole steel structure is improved.
Referring to fig. 2, in order to improve the anti-seismic effect, in this embodiment, a first sliding cavity and a second sliding cavity are arranged on the connecting seat 2, the cross sections of the first sliding cavity and the second sliding cavity are circular, and the axis of the first sliding cavity and the axis of the second sliding cavity form an acute included angle;
the damping device further comprises a first damping mechanism, the first damping mechanism comprises a first sliding rod 41, a first piston 42, a first spring 43, a second spring 44 and oil, the oil is filled in the first sliding cavity, the first sliding rod 41 is located in the first sliding cavity and extends to the outside of the first sliding cavity to be connected with the first buckling-restrained brace 31, the first piston 42 is fixed in the middle of the first sliding rod 41, the first piston 42 is in sliding fit with the inner wall of the first sliding cavity to divide the first sliding cavity into two chambers, a first damping hole is arranged on the first piston 42, the oil can flow back and forth in the two chambers through the first damping hole, the first spring 43 is sleeved on the first sliding rod 41 and located on the first side of the first piston 42, two ends of the first spring 43 are respectively abutted against the first piston 42 and the inner wall of the first sliding cavity, the second spring 44 is sleeved on the first sliding rod 41 and located on the second side of the first piston 42, two ends of the second spring 44 respectively abut against the first piston 42 and the inner wall of the first sliding cavity, the first piston 42 is located in the middle of the first sliding cavity in a free state of the first damping mechanism, a distance is reserved between the end part of the first sliding rod 41 far away from the first buckling-restrained brace 31 and the bottom of the first sliding cavity, and the first sliding rod 41 is restrained from moving under the elastic force action of the first spring 43 and the second spring 44 in the moving process;
the damping device further comprises a second damping mechanism, the second damping mechanism comprises a second sliding rod 51, a second piston 52, a third spring 53, a fourth spring 54 and oil, the oil is filled in the second sliding cavity, the second sliding rod 51 is located in the second sliding cavity and extends to the outside of the second sliding cavity to be connected with the second buckling-restrained brace 32, the second piston 52 is fixed in the middle of the second sliding rod 51, the second piston 52 is in sliding fit with the inner wall of the second sliding cavity to divide the second sliding cavity into two chambers, a second damping hole is formed in the second piston 52, the oil can flow back and forth in the two chambers through the second damping hole, the third spring 53 is sleeved on the second sliding rod 51 and located on the first side of the second piston 52, two ends of the third spring 53 are respectively abutted against the inner walls of the second piston 52 and the second sliding cavity, the fourth spring 54 is sleeved on the second sliding rod 51 and located on the second side of the second piston 52, two ends of the fourth spring 54 respectively abut against the second piston 52 and the inner wall of the second sliding cavity, the second piston 52 is located in the middle of the second sliding cavity in a free state of the second damping mechanism, a distance is reserved between the end of the second sliding rod 51 far away from the second buckling-restrained brace 32 and the bottom of the second sliding cavity, and the second sliding rod 51 is restrained from moving under the elastic force action of the third spring 53 and the fourth spring 54 in the moving process of the second sliding rod 51.
When an earthquake occurs, the earthquake energy is transmitted to the first sliding rod 41 through the first anti-buckling support 31, so that the first sliding rod 41 slides in the first sliding cavity, the first sliding rod 41 drives the first piston 42 to slide, the sliding speed of the first piston 42 is low because the sliding of the first piston 42 is restrained by the first spring 43, the second spring 44 and the oil, the energy transmitted by the first anti-buckling support 31 is consumed through the sliding of the first piston 42, the two-time energy consumption of the first anti-buckling support 31 and the first damping mechanism is realized, and only a small amount of earthquake energy is transmitted to the steel beam 1; similarly, the seismic energy is transmitted to the second slide rod 51 through the second buckling-restrained brace 32, so that the second slide rod 51 slides in the second slide cavity, the second slide rod 51 drives the second piston 52 to slide, the sliding speed of the second piston 52 is low as the sliding of the second piston 52 is restrained by the third spring 53, the fourth spring 54 and the oil, the energy transmitted by the second buckling-restrained brace 32 is consumed through the sliding of the second piston 52, the two-time energy consumption of the second buckling-restrained brace 32 and the second damping mechanism is realized, and only a small amount of seismic energy is transmitted to the steel beam 1; thereby ensuring that the steel structural member connected with the steel beam 1 is stable and not damaged when an earthquake occurs.
Further, the first slide bar 41 is hinged to the first buckling restrained brace 31, the first slide bar 41 and the first buckling restrained brace 31 can rotate relatively, and the rotation of the first buckling restrained brace 31 caused by an earthquake cannot be transmitted to the first slide bar 41, that is, the rotation of the first buckling restrained brace 31 cannot cause the first slide bar 41 to rotate, so that the first slide bar 41 is hinged to the first buckling restrained brace 31 to further consume earthquake energy; similarly, the second slide bar 51 is hinged to the second buckling restrained brace 32, the second slide bar 51 and the second buckling restrained brace 32 can rotate relatively, and the rotation of the second buckling restrained brace 32 caused by an earthquake is not transmitted to the second slide bar 51, that is, the rotation of the second buckling restrained brace 32 does not cause the second slide bar 51 to rotate, so that the second slide bar 51 is hinged to the second buckling restrained brace 32, and further earthquake energy is consumed.
Referring to fig. 2, the external steel structural member in the embodiment is directly connected to the connecting seat 2, and the specific design is as follows, a third sliding cavity is arranged on one side of the connecting seat 2 away from the buckling-restrained brace assembly;
the damping device further comprises a third damping mechanism, the third damping mechanism comprises a third sliding rod 61, a third piston 62, a fifth spring 63, a sixth spring 64 and oil, the oil is filled in the third sliding cavity, the third sliding rod 61 is positioned in the third sliding cavity and extends to the outside of the third sliding cavity to be connected with an external steel structural member, the third piston 62 is fixed in the middle of the third sliding rod 61, the third piston 62 is in sliding fit with the inner wall of the third sliding cavity to divide the third sliding cavity into two chambers, a third damping hole is formed in the third piston 62, the oil can flow back and forth in the two chambers through the third damping hole, the fifth spring 63 is sleeved on the third sliding rod 61 and is positioned on the first side of the third piston 62, two ends of the fifth spring 63 are respectively abutted against the inner walls of the third piston 62 and the third sliding cavity, the sixth spring 64 is sleeved on the third sliding rod 61 and is positioned on the second side of the third piston 62, two ends of a sixth spring 64 respectively abut against the third piston 62 and the inner wall of the third sliding cavity, the third piston 62 is located in the middle of the third sliding cavity in a free state of the third damping mechanism, a distance is reserved between the end, far away from the third buckling-prevention support, of the third slide bar 61 and the bottom of the third sliding cavity, and the third slide bar 61 is restrained from moving under the elastic force action of a fifth spring 63 and the sixth spring 64 in the moving process of the third slide bar 61.
The third slide bar 61 in the third damping mechanism is used for connecting the connecting seat 2 and an external steel structural member, when an earthquake occurs, after earthquake energy is transmitted to the connecting seat 2, the connecting seat 2 vibrates, and since the third piston 62 and the connecting seat 2 can slide relatively and the third piston 62 interacts in the third sliding cavity, the vibration of the connecting seat 2 does not cause the third piston 62 to vibrate synchronously, and further, the external steel structural member connected with the third slide bar 61 does not vibrate; therefore, the third group of mechanisms plays a role in connection and seismic energy consumption.
Referring to fig. 1, buckling restrained brace subassembly still includes elastic connection spare 7, and elastic connection spare 7 both ends are connected with first buckling restrained brace 31 middle part and second buckling restrained brace 32 middle part respectively, and elastic connection spare 7 of this implementation is the steel pipe, and steel pipe rigidity is less, can have deformation, can improve buckling restrained brace subassembly's stability simultaneously.
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. An anti-seismic steel structure with anti-buckling supports is characterized by comprising a steel beam (1), a plurality of connecting seats (2) and a plurality of anti-buckling support assemblies;
the connecting seats (2) are fixed on the steel beam (1) at equal intervals along the length direction of the steel beam (1);
the buckling-restrained brace assembly is connected with the connecting seats (2) and located below the connecting seats (2), the buckling-restrained brace assembly comprises a first buckling-restrained brace (31) and a second buckling-restrained brace (32), one end of the first buckling-restrained brace (31) is connected with the connecting seats (2), one end of the second buckling-restrained brace (32) is connected with the connecting seats (2), the first buckling-restrained brace (31) and the second buckling-restrained brace (32) are located in the same plane, and acute included angles are preset between the first buckling-restrained brace (31) and the second buckling-restrained brace (32);
a first sliding cavity and a second sliding cavity are arranged on the connecting seat (2);
the damping device further comprises a first damping mechanism, the first damping mechanism comprises a first sliding rod (41), a first piston (42), a first spring (43), a second spring (44) and oil, the first sliding rod (41) is located in the first sliding cavity and extends to the outside of the first sliding cavity to be connected with the first buckling-restrained brace (31), the first piston (42) is fixed in the middle of the first sliding rod (41), the first piston (42) is in sliding fit with the inner wall of the first sliding cavity, a first damping hole is formed in the first piston (42), the first spring (43) is sleeved on the first sliding rod (41) and located on the first side of the first piston (42), two ends of the first spring (43) are respectively abutted against the first piston (42) and the inner wall of the first sliding cavity, the second spring (44) is sleeved on the first sliding rod (41) and located on the second side of the first piston (42), two ends of the second spring (44) are respectively abutted against the first piston (42) and the inner wall of the first sliding cavity, the oil liquid is filled in the first sliding cavity, and a first piston (42) is positioned in the middle of the first sliding cavity in a free state of the first damping mechanism;
the damping mechanism comprises a second sliding rod (51), a second piston (52), a third spring (53), a fourth spring (54) and oil, the second sliding rod (51) is located in the second sliding cavity and extends to the outside of the second sliding cavity to be connected with a second buckling-restrained brace (32), the second piston (52) is fixed in the middle of the second sliding rod (51), the second piston (52) is in sliding fit with the inner wall of the second sliding cavity, a second damping hole is formed in the second piston (52), the third spring (53) is sleeved on the second sliding rod (51) and located on the first side of the second piston (52), two ends of the second spring (44) are respectively abutted against the second piston (52) and the inner wall of the second sliding cavity, the fourth spring (54) is sleeved on the second sliding rod (51) and located on the second side of the second piston (52), and two ends of the fourth spring (54) are respectively abutted against the second piston (52) and the inner wall of the second sliding cavity, the oil liquid is filled in the second sliding cavity, and a second piston (52) is positioned in the middle of the second sliding cavity in the free state of the second damping mechanism.
2. Earthquake-resistant steel structure provided with buckling restrained braces according to claim 1, characterized in that the first slide bar (41) is hinged with the first buckling restrained brace (31) and the second slide bar (51) is hinged with the second buckling restrained brace (32).
3. The anti-seismic steel structure with the anti-buckling support is characterized in that a third sliding cavity is formed in one side, away from the anti-buckling support assembly, of the connecting seat (2);
the damping mechanism comprises a third sliding rod (61), a third piston (62), a fifth spring (63), a sixth spring (64) and oil, the third sliding rod (61) is located in the third sliding cavity and extends to the outside of the second sliding cavity, the third piston (62) is fixed in the middle of the third sliding rod (61), the third piston (62) is in sliding fit with the inner wall of the third sliding cavity, a third damping hole is formed in the third piston (62), the fifth spring (63) is sleeved on the third sliding rod (61) and located on the first side of the third piston (62), two ends of the fifth spring (63) are respectively abutted against the third piston (62) and the inner wall of the third sliding cavity, the sixth spring (64) is sleeved on the third sliding rod (61) and located on the second side of the third piston (62), two ends of the sixth spring (64) are respectively abutted against the third piston (62) and the inner wall of the third sliding cavity, the oil liquid is filled in the third sliding cavity, and a third piston (62) is positioned in the middle of the third sliding cavity in the free state of a third damping mechanism.
4. An earthquake-proof steel structure with anti-buckling supports according to claim 1, characterized in that the anti-buckling support assembly further comprises an elastic connecting piece (7), and two ends of the elastic connecting piece (7) are respectively connected with the middle parts of the first anti-buckling support (31) and the second anti-buckling support (32).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910262193.0A CN110067426B (en) | 2019-04-02 | 2019-04-02 | Anti-seismic steel structure with buckling-restrained brace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201910262193.0A CN110067426B (en) | 2019-04-02 | 2019-04-02 | Anti-seismic steel structure with buckling-restrained brace |
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| CN110067426A CN110067426A (en) | 2019-07-30 |
| CN110067426B true CN110067426B (en) | 2020-10-27 |
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Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3791133B2 (en) * | 1997-07-14 | 2006-06-28 | 株式会社大林組 | Damping structure using a disc spring friction damper |
| CN206495353U (en) * | 2017-02-15 | 2017-09-15 | 北京四汇建筑工程有限责任公司 | A kind of buckling restrained brace device |
| CN206495354U (en) * | 2017-02-15 | 2017-09-15 | 北京四汇建筑工程有限责任公司 | Buckling restrained brace structure |
| CN105468827B (en) * | 2015-11-18 | 2018-09-07 | 中铁大桥科学研究院有限公司 | A kind of inclined type bridge earthquake resistance damper and its parameter optimization method |
-
2019
- 2019-04-02 CN CN201910262193.0A patent/CN110067426B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3791133B2 (en) * | 1997-07-14 | 2006-06-28 | 株式会社大林組 | Damping structure using a disc spring friction damper |
| CN105468827B (en) * | 2015-11-18 | 2018-09-07 | 中铁大桥科学研究院有限公司 | A kind of inclined type bridge earthquake resistance damper and its parameter optimization method |
| CN206495353U (en) * | 2017-02-15 | 2017-09-15 | 北京四汇建筑工程有限责任公司 | A kind of buckling restrained brace device |
| CN206495354U (en) * | 2017-02-15 | 2017-09-15 | 北京四汇建筑工程有限责任公司 | Buckling restrained brace structure |
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| CN110067426A (en) | 2019-07-30 |
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