CN116815947B - Passive reset rigidity energy dissipation arm extension system of high-rise building structure - Google Patents
Passive reset rigidity energy dissipation arm extension system of high-rise building structure Download PDFInfo
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- CN116815947B CN116815947B CN202311107758.0A CN202311107758A CN116815947B CN 116815947 B CN116815947 B CN 116815947B CN 202311107758 A CN202311107758 A CN 202311107758A CN 116815947 B CN116815947 B CN 116815947B
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- 230000021715 photosynthesis, light harvesting Effects 0.000 title claims abstract description 24
- 239000003921 oil Substances 0.000 claims description 36
- 239000012530 fluid Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 6
- 230000006835 compression Effects 0.000 claims description 3
- 238000007906 compression Methods 0.000 claims description 3
- 239000010720 hydraulic oil Substances 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- 229920002545 silicone oil Polymers 0.000 claims description 3
- 235000017166 Bambusa arundinacea Nutrition 0.000 claims 2
- 235000017491 Bambusa tulda Nutrition 0.000 claims 2
- 241001330002 Bambuseae Species 0.000 claims 2
- 235000015334 Phyllostachys viridis Nutrition 0.000 claims 2
- 239000011425 bamboo Substances 0.000 claims 2
- 230000004044 response Effects 0.000 abstract description 5
- 238000006073 displacement reaction Methods 0.000 description 9
- 230000000694 effects Effects 0.000 description 6
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 5
- 230000007704 transition Effects 0.000 description 3
- 238000010276 construction Methods 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000000149 penetrating effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- E—FIXED CONSTRUCTIONS
- E04—BUILDING
- E04B—GENERAL BUILDING CONSTRUCTIONS; WALLS, e.g. PARTITIONS; ROOFS; FLOORS; CEILINGS; INSULATION OR OTHER PROTECTION OF BUILDINGS
- E04B1/00—Constructions in general; Structures which are not restricted either to walls, e.g. partitions, or floors or ceilings or roofs
- E04B1/62—Insulation or other protection; Elements or use of specified material therefor
- E04B1/92—Protection against other undesired influences or dangers
- E04B1/98—Protection against other undesired influences or dangers against vibrations or shocks; against mechanical destruction, e.g. by air-raids
Abstract
The invention discloses a passive reset rigidity energy dissipation cantilever system of a high-rise building structure, which belongs to the technical field of vibration control of the high-rise building structure and comprises a core tube, a cantilever truss, an outer frame column and a passive reset rigidity damper, wherein the passive reset rigidity damper comprises an oil cylinder, a piston, a groove-shaped rod and a bypass loop; the two ends of the bypass loop are respectively communicated with the upper chamber and the lower chamber, and the bypass loop is provided with a normally closed bypass valve, and a swing needle of the normally closed bypass valve is abutted in a groove of the rack. The invention realizes the resetting of rigidity in a passive control mode, solves the problem that the existing active/semi-active control mode needs external energy input, and improves the reliability and the energy dissipation capacity of the dynamic response control of the super high-rise building structure.
Description
Technical Field
The invention relates to the field of vibration control of high-rise building structures, in particular to a passive reset rigidity energy dissipation cantilever system of a high-rise building structure.
Background
With the rapid development of global economy, the building structure system is increasingly perfected and the construction technology level is continuously improved, and a large number of high-rise and super-high-rise buildings are emerging. The super high-rise building structure adopts a plurality of structural systems, and the frame-arm-extending-core tube system is the most widely applied system in the construction of the super high-rise structure after 21 st century. Conventional boom systems utilize boom trusses to connect the outer frame columns and the central core tube to increase the anti-side stiffness of the structure, but lack additional energy dissipation devices. The energy dissipation cantilever system is based on the deformation characteristics of the traditional cantilever system, and energy dissipation components such as viscous dampers, buckling restrained braces and the like are arranged at the connection position of the outer frame column and the cantilever truss end, so that the energy dissipation capability of the energy dissipation components is fully exerted by utilizing larger vertical relative deformation concentrated between the cantilever end and the outer frame column.
However, most of the existing energy dissipation arm extension systems adopt passive control energy dissipation components such as viscous dampers, buckling restrained braces and the like, and the vibration control effect is limited; however, the vibration control effect of the active/semi-active control mode is good, but external energy input is required, and the reliability of dynamic response control on the super high-rise building structure is low, so that vibration reduction measures of the high-rise building structure capable of realizing the active/semi-active control effect in a passive control mode are urgently needed.
Disclosure of Invention
The invention aims to provide a passive reset rigidity energy dissipation arm extension system of a high-rise building structure, overcomes the defects of the prior art, realizes rigidity reset in a passive control mode, solves the problem that external energy input is required in the existing active/semi-active control mode, and improves the reliability and energy dissipation capacity of power response control of the super high-rise building structure.
The invention provides a passive reset rigidity energy dissipation cantilever system of a high-rise building structure, which comprises a core tube, a cantilever truss, an outer frame column and a passive reset rigidity damper, wherein the cantilever truss is fixedly connected to the side wall of the core tube, the tail end of the cantilever truss is fixedly connected with the outer frame column through the passive reset rigidity damper, the passive reset rigidity damper comprises an oil cylinder, a piston, a groove-shaped rod and a bypass loop, the side wall of the oil cylinder is fixedly connected with the cantilever truss through a base plate, the oil cylinder is filled with fluid, the piston comprises a horizontal plug body and a vertical rod body which are fixedly connected with each other, the horizontal plug body divides the oil cylinder into an upper cavity and a lower cavity, the upper end and the lower end of the vertical rod body respectively penetrate through a bracket on the outer frame column after penetrating out of the oil cylinder, the two ends of the vertical rod body extend out of the oil cylinder are respectively fixedly connected with the two ends of the groove-shaped rod, and a rack is arranged on one side surface of the vertical rod, which is close to the oil cylinder;
the bypass loop is located between the oil cylinder and the rack, two ends of the bypass loop are respectively communicated with the upper cavity and the lower cavity, a normally closed bypass valve is arranged on the bypass loop and comprises a valve pipe, a spring, a sliding block and a swing needle, the spring, the sliding block and the swing needle are sequentially arranged in the valve pipe, the valve pipe is communicated with the bypass loop through an upper interface and a lower interface, the valve pipe is vertically penetrated by the groove-shaped rod and is in sliding sealing connection with the groove-shaped rod, one end of the spring is fixedly connected with the inner wall of the valve pipe, the other end of the spring is fixedly connected with the sliding block, the other end of the sliding block is in rotating connection with the swing needle, the other end of the swing needle is abutted to a groove of the rack, when the swing needle is perpendicular to the groove-shaped rod, the sliding block is in a staggered arrangement with the upper interface and the lower interface, when the swing needle is not perpendicular to the groove-shaped rod, the sliding block is in an upper interface and a closed state, and the normally closed bypass valve is in a closed state.
Preferably, the valve tube is provided with an upper slit and a lower slit for the groove-shaped rod to pass through, and sealing strips are arranged between the upper slit and the groove-shaped rod and between the lower slit and the groove-shaped rod.
Preferably, one end of the valve tube is fixedly connected with the outer side wall of the oil cylinder.
Preferably, the fluid is a liquid with a small volume compression coefficient.
Preferably, the fluid is hydraulic oil or silicone oil.
Therefore, the passive reset rigidity energy dissipation arm extension system of the high-rise building structure adopting the structure has the following beneficial effects:
1. the invention combines the characteristics of an energy dissipation cantilever system, a passive reset stiffness damper is arranged between the cantilever truss and an outer frame column, and the normally closed bypass valve is controlled to be opened and closed by utilizing the relative vertical displacement of the piston and the oil cylinder, so that stiffness, reset stiffness and energy dissipation are generated.
2. The invention solves the problem that external energy input is needed in active/semi-active control, achieves the effect of the existing active/semi-active control mode in a passive control mode, and improves the reliability of structural power response control.
3. The invention can be integrated with the arm extending system of the super high-rise building structure, does not occupy redundant space, and is easy to install and maintain.
The technical scheme of the invention is further described in detail through the drawings and the embodiments.
Drawings
FIG. 1 is a schematic elevation view of the passive return stiffness energy dissipating boom system of the high-rise building structure of the present invention in a super high-rise building arrangement;
FIG. 2 is an enlarged schematic view at A in FIG. 1;
FIG. 3 is a schematic illustration of an embodiment of a passive return stiffness damper in a passive return stiffness energy dissipating boom system of a high rise building structure of the present invention;
FIG. 4 is a graph showing force versus piston displacement for a passive restoring stiffness damper of the present invention in operation;
FIG. 5 is a schematic illustration of the normally closed bypass valve operating in section OA of FIG. 4;
FIG. 6 is a schematic diagram of the normally closed bypass valve in the operational state transition of section AB of FIG. 4;
FIG. 7 is a schematic diagram of the normally closed bypass valve in transition from the operating state of section CD of FIG. 4.
Reference numerals
1. A core tube; 2. an extension arm truss; 3. an outer frame column; 4. a passive reset stiffness damper; 41. an oil cylinder; 42. a piston; 421. a horizontal plug body; 422. a vertical rod body; 43. a channel shaped rod; 44. a bypass circuit; 45. a rack; 46. a normally closed bypass valve; 461. a valve tube; 462. a spring; 463. a slide block; 464. a swing needle; 5. a backing plate; 6. ear plates; 7. and (5) bracket.
Detailed Description
Embodiments of the present invention will be further described with reference to the accompanying drawings.
As shown in figures 1-7, the passive reset rigidity energy dissipation cantilever system of the high-rise building structure comprises a core tube 1, a cantilever truss 2, an outer frame column 3 and a passive reset rigidity damper 4, wherein the cantilever truss 2 is fixedly connected to the side wall of the core tube 1, and the tail end of the cantilever truss 2 is connected with the outer frame column 3 through the passive reset rigidity damper 4. The passive reset stiffness damper 4 comprises an oil cylinder 41, a piston 42, a groove-shaped rod 43 and a bypass loop 44, wherein the side wall of the oil cylinder 41 is fixedly connected with the cantilever truss 2 through a base plate 5, the base plate 5 can protect the side wall of the oil cylinder 41 in vibration, and the service life of the oil cylinder 41 is ensured. The cylinder 41 is filled with a fluid, which is a liquid having a small volume compression coefficient, such as hydraulic oil or silicone oil.
The piston 42 includes a horizontal stopper 421 and a vertical rod 422 fixedly connected to each other, and the horizontal stopper 421 divides the cylinder 41 into an upper chamber and a lower chamber. The upper end and the lower end of the vertical rod body 422 respectively penetrate through the oil cylinder 41 and then are hinged with the bracket 7 on the outer frame column 3 through the lug plates 6, the two ends of the vertical rod body 422 extending out of the oil cylinder 41 are respectively fixedly connected with the two ends of the groove-shaped rod 43, a rack 45 is arranged on one side surface of the groove-shaped rod 43, which is close to the oil cylinder 41, the vertical rod body 422 can realize the fixed connection between the piston 42 and the outer frame column 3 and between the rack 45 and the outer frame column 3, and when relative vertical deformation is generated between the end part of the cantilever truss 2 and the outer frame column 3, relative vertical movement is generated between the oil cylinder 41 and the piston 42 and between the oil cylinder 41 and the rack 45.
The bypass circuit 44 is located between the cylinder 41 and the rack 45, two ends of the bypass circuit 44 are respectively communicated with the upper chamber and the lower chamber, and a normally closed bypass valve 46 is arranged on the bypass circuit 44, and when the normally closed bypass valve 46 is closed, the fluid in the upper chamber and the fluid in the lower chamber are not communicated with each other. The normally closed bypass valve 46 includes a valve tube 461, and a spring 462, a slider 463 and a needle 464 which are sequentially provided in the valve tube 461, the valve tube 461 is communicated with the bypass circuit 44 through an upper interface and a lower interface, and the valve tube 461 is vertically penetrated by the groove-shaped rod 43 and is slidably and hermetically connected with the groove-shaped rod 43. The sliding sealing connection may be realized by providing an upper slit and a lower slit for the groove-shaped rod 43 to pass through on the valve tube 461, and sealing strips are provided between the upper slit and the groove-shaped rod 43 and between the lower slit and the groove-shaped rod 43. One end of the valve tube 461 is fixedly connected with the outer side wall of the oil cylinder 41, and the connection of the valve tube 461 and the oil cylinder 41 can increase the stability of the valve tube 461 and prevent cracks from being generated at the upper interface and the lower interface after long-time use.
One end of the spring 462 is fixedly connected with the inner wall of the valve tube 461, the other end of the spring 462 is fixedly connected with the slider 463, the other end of the slider 463 is rotatably connected with the balance needle 464, and the other end of the balance needle 464 is abutted in the groove of the rack 45. The spring 462 has proper pre-pressure, so that the sliding block 463 applies a pushing force to the swing needle 464, the tail end of the swing needle 464 is always located in the groove of the rack 45, and meanwhile, the deformation performance of the spring 462 enables the swing needle 464 to swing in the valve tube 461 under the stirring of the rack 45, so that the state transition between the swing needle 464 and the groove-shaped rod is realized. When the swing needle 464 is perpendicular to the groove-shaped rod 43, the sliding block 463 is arranged in a staggered manner with the upper connector and the lower connector, the normally closed bypass valve 46 is in an open state, when the swing needle is not perpendicular to the groove-shaped rod 43, the sliding block 463 is blocked between the upper connector and the lower connector, and the normally closed bypass valve 46 is in a closed state, so that fluid in the upper chamber and fluid in the lower chamber are not communicated with each other.
When the core tube 1 is subjected to horizontal external force to generate rotation deformation, relative vertical deformation is generated between the end part of the cantilever truss 2 and the outer frame column 3, and the relative vertical deformation acts on the passive reset stiffness damper 4, so that synchronous vertical displacement is generated between the piston 42 and the oil cylinder 41 and between the rack 45 and the normally closed bypass valve 46, and the force in the passive reset stiffness damper 4 is changed by the vertical displacement of the piston 42 and the oil cylinder 41. The curve of the relative displacement between the force and the piston in the passive restoring stiffness damper 4 is shown in fig. 4, the point O is the initial state, the normally closed bypass valve 46 is set to be in the closed state as shown in fig. 5, the balance needle is at the maximum inclination angle, the section OA shows the process of moving the piston 42 upwards to the maximum relative displacement relative to the oil cylinder 41, in this process, the fluid in the upper chamber and the lower chamber is not circulated, the piston 42 compresses the fluid in the oil cylinder 41, thereby providing the integral stiffness of the structure, and energy is stored in the passive restoring stiffness damper 4, and meanwhile, the balance needle 464 slides between the balance needle and the rack due to the maximum inclination angle; segment AB indicates the process of moving the piston 42 downward in the opposite direction, causing the rack 45 to oscillate with the needle 464 in a direction perpendicular to the channel shaped rod 43, during which the normally closed bypass valve 46 is still in a closed state, providing structural overall stiffness despite the reduced force in the passive return stiffness damper 4; the BC section indicates that the piston 42 just moves downwards to the rack 45 to dial the balance needle 464 to a position vertical to the groove-shaped rod 43, the balance needle realizes the balance amplitude with the size of d, at the moment, the sliding block 463 is staggered with the upper interface and the lower interface, the normally closed bypass valve 46 is opened, the fluid in the upper cavity and the lower cavity is circulated, and the rigidity reset and the energy dissipation are realized; the CD section indicates that piston 42 continues to move down until maximum relative displacement, during which rack 45 dials needle 464 from perpendicular to channel bar 43 to maximum tilt and slip occurs between needle 464 and needle 464 after needle 464 is dialed to maximum tilt, slider 463 is spring biased to a position opposite upper and lower ports, normally closed bypass valve 46 is closed, fluid in upper and lower chambers is not in communication with each other, piston 42 compresses fluid in cylinder 41, thereby providing structural overall stiffness and storing energy in passive reset stiffness damper 4; the DE section represents the process of moving the piston 42 up again, causing the rack 45 to oscillate with the needle 464 in a direction perpendicular to the channel shaped rod 43, during which the normally closed bypass valve 46 is still in a closed state, providing structural overall stiffness despite the reduced force in the passive return stiffness damper 4; the EF section indicates that the piston 42 moves right up to the rack 45 to dial the needle 464 to a position perpendicular to the grooved bar 43, the needle realizes a swing with a size d, at this time, the slider 463 is staggered with respect to the upper port and the lower port, the normally closed bypass valve 46 is opened, fluid in the upper chamber and the lower chamber is circulated, the stiffness reset and the energy dissipation are realized, the FG section indicates that the piston 42 continues to move up and move to the maximum relative displacement, during this process, the rack 45 dials the needle 464 from a state perpendicular to the grooved bar 43 to a state of maximum inclination, and after the needle 464 is dialed to a state of maximum inclination, slipping occurs between the needle 464, the slider 463 is pushed by a spring to a position opposite to the upper port and the lower port, the normally closed bypass valve 46 is closed, the fluid in the upper chamber and the lower chamber are not circulated with each other, the piston 42 compresses the fluid in the cylinder 41, thereby providing the overall stiffness of the structure, and storing the energy in the passive reset stiffness damper 4.
Therefore, each time the movement direction of the piston 42 of the passive restoring stiffness damper 4 relative to the cylinder 41 changes, the normally closed bypass valve 46 is opened and closed instantaneously, so that the restoring stiffness effect which can be realized by the traditional active/semi-active control is realized in a passive control mode, and the vibration problem of the super high-rise building cantilever structure system under the action of external power load is effectively controlled.
Therefore, the passive reset rigidity energy dissipation cantilever system of the high-rise building structure adopts the structure, combines the characteristics of the energy dissipation cantilever system, arranges a passive reset rigidity damper between the cantilever truss and the outer frame column, and controls the normally closed bypass valve to be opened and closed by utilizing the relative vertical displacement of the piston and the oil cylinder so as to generate rigidity, reset rigidity and dissipated energy; the problem that external energy is required for active/semi-active control is solved, the effect of the existing active/semi-active control mode is realized in a passive control mode, and the reliability of structural power response control is improved; can be integrated with the arm extending system of the super high-rise building structure, does not occupy redundant space, and is easy to install and maintain.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention and not for limiting it, and although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that: the technical scheme of the invention can be modified or replaced by the same, and the modified technical scheme cannot deviate from the spirit and scope of the technical scheme of the invention.
Claims (5)
1. The utility model provides a high-rise building structure passive form rigidity energy dissipation arm stretching system that resets, includes core section of thick bamboo, arm stretching truss, outer frame post and passive form rigidity damper that resets, arm stretching truss fixed connection in on the lateral wall of core section of thick bamboo, the end of arm stretching truss is passed through passive form rigidity damper that resets with outer frame post is connected, its characterized in that: the passive reset stiffness damper comprises an oil cylinder, a piston, a groove-shaped rod and a bypass loop, wherein the side wall of the oil cylinder is fixedly connected with the cantilever truss through a base plate, the oil cylinder is filled with fluid, the piston comprises a horizontal plug body and a vertical rod body which are fixedly connected with each other, the oil cylinder is divided into an upper cavity and a lower cavity by the horizontal plug body, the upper end and the lower end of the vertical rod body respectively penetrate through the oil cylinder and then are hinged with brackets on an outer frame column through ear plates, the two ends of the vertical rod body extending out of the oil cylinder are respectively fixedly connected with the two ends of the groove-shaped rod, and a rack is arranged on one side surface of the groove-shaped rod, which is close to the oil cylinder;
the bypass loop is located between the oil cylinder and the rack, two ends of the bypass loop are respectively communicated with the upper cavity and the lower cavity, a normally closed bypass valve is arranged on the bypass loop and comprises a valve pipe, a spring, a sliding block and a swing needle, the spring, the sliding block and the swing needle are sequentially arranged in the valve pipe, the valve pipe is communicated with the bypass loop through an upper interface and a lower interface, the valve pipe is vertically penetrated by the groove-shaped rod and is in sliding sealing connection with the groove-shaped rod, one end of the spring is fixedly connected with the inner wall of the valve pipe, the other end of the spring is fixedly connected with the sliding block, the other end of the sliding block is in rotating connection with the swing needle, the other end of the swing needle is abutted to a groove of the rack, when the swing needle is perpendicular to the groove-shaped rod, the sliding block is in a staggered arrangement with the upper interface and the lower interface, when the swing needle is not perpendicular to the groove-shaped rod, the sliding block is in an upper interface and a closed state, and the normally closed bypass valve is in a closed state.
2. The passive restoring rigidity energy dissipating cantilever system of high-rise building structure according to claim 1, wherein: the valve pipe is provided with an upper slit and a lower slit for the groove-shaped rod to pass through, and sealing strips are arranged between the upper slit and the groove-shaped rod and between the lower slit and the groove-shaped rod.
3. The passive restoring rigidity energy dissipating cantilever system of high-rise building structure according to claim 2, wherein: one end of the valve tube is fixedly connected with the outer side wall of the oil cylinder.
4. A passive restoring stiffness energy dissipating boom system for a high-rise building structure as set forth in claim 3, wherein: the fluid is a liquid with a small volume compression coefficient.
5. The passive restoring rigidity energy dissipating cantilever system of high-rise building structure according to claim 4, wherein: the fluid is hydraulic oil or organic silicone oil.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311107758.0A CN116815947B (en) | 2023-08-31 | 2023-08-31 | Passive reset rigidity energy dissipation arm extension system of high-rise building structure |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311107758.0A CN116815947B (en) | 2023-08-31 | 2023-08-31 | Passive reset rigidity energy dissipation arm extension system of high-rise building structure |
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| CN116815947A CN116815947A (en) | 2023-09-29 |
| CN116815947B true CN116815947B (en) | 2023-10-31 |
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000145162A (en) * | 1998-11-06 | 2000-05-26 | Tatsuji Ishimaru | Earthquake-resistant reinforcing structure |
| CN104389354A (en) * | 2014-11-12 | 2015-03-04 | 清华大学 | Semi-girder damping system capable of realizing self-restoration after earthquake in super high-rise building |
| CN204266394U (en) * | 2014-11-12 | 2015-04-15 | 清华大学 | The semi-girder damping system of the rear Self-resetting of shake is realized in super highrise building |
| CN113107104A (en) * | 2021-04-06 | 2021-07-13 | 东莞理工学院 | Improved energy dissipation cantilever control system |
| CN114197751A (en) * | 2021-12-28 | 2022-03-18 | 中城建(福建)建筑设计研究院有限公司 | Damping energy-consuming type outrigger truss high-rise structure system |
| CN116464181A (en) * | 2023-04-26 | 2023-07-21 | 中建八局发展建设有限公司 | Truss damping device |
-
2023
- 2023-08-31 CN CN202311107758.0A patent/CN116815947B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000145162A (en) * | 1998-11-06 | 2000-05-26 | Tatsuji Ishimaru | Earthquake-resistant reinforcing structure |
| CN104389354A (en) * | 2014-11-12 | 2015-03-04 | 清华大学 | Semi-girder damping system capable of realizing self-restoration after earthquake in super high-rise building |
| CN204266394U (en) * | 2014-11-12 | 2015-04-15 | 清华大学 | The semi-girder damping system of the rear Self-resetting of shake is realized in super highrise building |
| CN113107104A (en) * | 2021-04-06 | 2021-07-13 | 东莞理工学院 | Improved energy dissipation cantilever control system |
| CN114197751A (en) * | 2021-12-28 | 2022-03-18 | 中城建(福建)建筑设计研究院有限公司 | Damping energy-consuming type outrigger truss high-rise structure system |
| CN116464181A (en) * | 2023-04-26 | 2023-07-21 | 中建八局发展建设有限公司 | Truss damping device |
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| CN116815947A (en) | 2023-09-29 |
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