CN202090457U - Shearing earthquake-resistant damper for architectural structure with mild steels in parallel - Google Patents
Shearing earthquake-resistant damper for architectural structure with mild steels in parallel Download PDFInfo
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- CN202090457U CN202090457U CN2011201749279U CN201120174927U CN202090457U CN 202090457 U CN202090457 U CN 202090457U CN 2011201749279 U CN2011201749279 U CN 2011201749279U CN 201120174927 U CN201120174927 U CN 201120174927U CN 202090457 U CN202090457 U CN 202090457U
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Abstract
The utility model discloses a shearing earthquake-resistant damper for an architectural structure with mild steels in parallel, which relates to the technical field of architectural engineering, and solves the technical problems of improving the anti-seismic performance of the architectural structure, decreasing the post-earthquake repair cost and ensuring normal use of post-earthquake architectural structure. The damper comprises two rectangular low-yield-point mild steel plates, two lateral reinforced steel rib plates and two node plates; the plate surfaces of the two low-yield-point mild steel plates are parallel to each other, and the peripheral edges thereof are parallel; the two lateral reinforced steel rib plates are fixedly welded at the left and right sides of the two low-yield-point mild steel plates respectively; the two node plates are fixedly welded at the upper and lower sides of the two low-yield-point mild steel plates; and the plate surfaces of the two low-yield-point mild steel plates are vertical to the plate surfaces of the lateral reinforced steel rib plates and the plate surfaces of the node plates. The damper provided by the utility model can efficiently consume earthquake energy; and moreover, the damper is low in cost and convenient to repair and replace.
Description
Technical field
The utility model relates to the technology of construction work, particularly relates to the technology of a kind of shearing-type mild steel building structure aseismatic in parallel damper.
Background technology
Fast development along with Urbanization in China, be accompanied by diversified day by day instructions for use, large amount of complex build high level and super-high building structure continue to bring out, this has brought new huge challenge to seismic design---and building structure can be satisfied the bearing capacity calculation requirement except needs, also wants to realize the design object of performanceization.In this case, by traditional structural arrangement form, the design section of members such as beam, post must be very big, also is that earthquake response increases but can cause dead load like this; Also have an important contradiction to be in addition, after the earthquake shock of traditional structure experience, collapse even without integral body takes place, often also can be very high to the reparation cost of members such as beam, post, and can bring influence to the normal use of building structure.
The utility model content
At the defective that exists in the above-mentioned prior art, technical problem to be solved in the utility model provides a kind of effectively earthquake energy, and cost is low, is convenient to repair the shearing-type mild steel building structure aseismatic in parallel damper of replacing simultaneously.
In order to solve the problems of the technologies described above, a kind of shearing-type provided by the utility model mild steel building structure aseismatic in parallel damper is characterized in that: comprise two rectangle low-yield mild steel plates, two sidepieces put more energy into steel floor and two gusset plates;
The plate face of described two low-yield mild steel plates is parallel to each other, and the surrounding is along flushing;
Described two sidepieces be placed in left and right sides of two low-yield mild steel plates of steel floor of putting more energy into, and the put more energy into left margin solid welding of plate face and two low-yield mild steel plates of steel floor of left side sidepiece, right side sidepiece are put more energy into the right of the plate face of steel floor and two low-yield mild steel plates along solid welding;
The be placed in both sides up and down of two low-yield mild steel plates of described two gusset plates, and the upper edge solid welding of the plate face of upside gusset plate and two low-yield mild steel plates, the plate face of downside gusset plate and the lower edge solid welding of two low-yield mild steel plates;
The put more energy into plate face of plate face, each gusset plate of steel floor of the plate face of described two low-yield mild steel plates and each sidepiece is all vertical.
Further, the yield strength of described low-yield mild steel plate is smaller or equal to 235MPa, and its elongation per unit length is greater than 40%.
Further, the ratio of the spacing between the spacing between the last lower edge of described low-yield mild steel plate and its edge, left and right sides is 0.5～2.
Further, the plate face of described low-yield mild steel plate middle part has a through hole.
Further, the through hole that the plate face middle part of described low-yield mild steel plate is offered is an ellipse hole, the minor axis of described ellipse hole is parallel to the minor face of low-yield mild steel plate, and the length of its minor axis is smaller or equal to 0.7 times of low-yield mild steel plate bond length.
Further, the plate face of two low-yield mild steel plates all is divided at least two daughter boards from top to bottom, and the daughter board quantity of two low-yield mild steel plates is identical, all be welded with the level steel floor of putting more energy between per two neighbouring daughter boards, described level puts more energy into that the plate face of steel floor is parallel to the last lower edge of low-yield mild steel plate and perpendicular to the plate face of low-yield mild steel plate.
Further, the plate face of two low-yield mild steel plates all is divided at least two daughter boards from left to right, and the daughter board quantity of two low-yield mild steel plates is identical, all be welded with the steel floor of vertically putting more energy between the adjacent daughter board in per two left and right sides, the plate face of the described steel floor of vertically putting more energy into is parallel to the edge, the left and right sides of low-yield mild steel plate and perpendicular to the plate face of low-yield mild steel plate.
Further, the plate face of two low-yield mild steel plates all is divided into the daughter board matrix of at least two row two row, and the daughter board matrix of two low-yield mild steel plates is identical, all be welded with the steel floor of vertically putting more energy between the adjacent daughter board in per two row left and right sides, all be welded with the level steel floor of putting more energy between the neighbouring daughter board of per two row, the plate face of the described steel floor of vertically putting more energy into is parallel to the edge, the left and right sides of low-yield mild steel plate and perpendicular to the plate face of low-yield mild steel plate, and described level puts more energy into that the plate face of steel floor is parallel to the last lower edge of low-yield mild steel plate and perpendicular to the plate face of low-yield mild steel plate.
Further, the plate face of every daughter board middle part all has an ellipse hole, and the minor axis of described ellipse hole is parallel to the minor face of daughter board, and the length of its minor axis is smaller or equal to 0.7 times of the daughter board bond length.
Further, the plate face of every daughter board middle part all has a runway shape through hole, the arc limit of the evagination of Kong Bianwei up and down of described runway shape through hole, and left and right sides Kong Bianwei straight flange, the spacing between the Kong Bian of its left and right sides is smaller or equal to 0.7 times of the daughter board bond length.
Shearing-type that the utility model provides mild steel building structure aseismatic in parallel damper, with upper and lower gusset plate respectively with the beams and slabs and steel support and connection of building structure after, can with agent structure co-operation, effective earthquake energy, and cheap.Little shake stage (being elastic stage), the low-yield mild steel plate can increase the structure lateral rigidity, reduces relative storey displacement; In the big shake stage (being elastic-plastic phase), the distortion of the hysteresis of low-yield mild steel plate can earthquake energy, thus the main component of protection structure; By perforate, can significantly improve deformability, the optimization stress distribution of mild steel plate, avoid forming the X-shaped cross fracture that runs through, thereby improve its hysteretic energy performance all sidedly.And be convenient to after the earthquake repair to change, the economic cost of its reparation and replacing is also less, the follow-up normal use of building structure is not brought influence substantially.
Description of drawings
Fig. 1 is the front view of the shearing-type mild steel building structure aseismatic in parallel damper of the utility model first embodiment;
Fig. 2 is the vertical view after the shearing-type mild steel building structure aseismatic in parallel damper of the utility model first embodiment removes the upside gusset plate;
Fig. 3 is the front view of the shearing-type mild steel building structure aseismatic in parallel damper of the utility model second embodiment;
Fig. 4 is the front view of the shearing-type mild steel building structure aseismatic in parallel damper of the utility model the 3rd embodiment;
Fig. 5 is the front view of the shearing-type mild steel building structure aseismatic in parallel damper of the utility model the 4th embodiment;
Fig. 6 is the front view of the shearing-type mild steel building structure aseismatic in parallel damper of the utility model the 5th embodiment.
The specific embodiment
Below in conjunction with description of drawings embodiment of the present utility model is described in further detail, but present embodiment is not limited to the utility model, every employing analog structure of the present utility model and similar variation thereof all should be listed protection domain of the present utility model in.
As Fig. 1-shown in Figure 2, a kind of shearing-type mild steel building structure aseismatic in parallel damper that the utility model first embodiment is provided is characterized in that: comprise two rectangle low-yield mild steel plates 11, two sidepieces put more energy into steel floor 12 and two gusset plates 13;
The plate face of described two low-yield mild steel plates 11 is parallel to each other, and the surrounding is along flushing;
Described two sidepieces be placed in left and right sides of two low-yield mild steel plates 11 of steel floor 12 of putting more energy into, and the put more energy into left margin solid welding of plate face and two low-yield mild steel plates 11 of steel floor 12 of left side sidepiece, right side sidepiece are put more energy into the right of the plate face of steel floor 12 and two low-yield mild steel plates 11 along solid welding;
The be placed in both sides up and down of two low-yield mild steel plates 11 of described two gusset plates 13, and the plate face of upside gusset plate 13 and the upper edge solid welding of two low-yield mild steel plates 11, the plate face of downside gusset plate 13 and the lower edge solid welding of two low-yield mild steel plates 11;
The put more energy into plate face of plate face, each gusset plate 13 of steel floor 12 of the plate face of described two low-yield mild steel plates 11 and each sidepiece is all vertical.
Among the utility model first embodiment, the yield strength of described low-yield mild steel plate is smaller or equal to 235MPa, and its elongation per unit length is greater than 40%.
Among the utility model first embodiment, the ratio of the spacing between the spacing between the last lower edge of described low-yield mild steel plate and its edge, left and right sides is 0.5～2.
As shown in Figure 3, a kind of shearing-type that the utility model second embodiment is provided mild steel building structure aseismatic in parallel damper is characterized in that: comprise two rectangle low-yield mild steel plates 21, two sidepieces put more energy into steel floor 22 and two gusset plates 23;
The plate face of described two low-yield mild steel plates 21 is parallel to each other, and the surrounding is along flushing;
Described two sidepieces be placed in left and right sides of two low-yield mild steel plates 21 of steel floor 22 of putting more energy into, and the put more energy into left margin solid welding of plate face and two low-yield mild steel plates 21 of steel floor 22 of left side sidepiece, right side sidepiece are put more energy into the right of the plate face of steel floor 22 and two low-yield mild steel plates 21 along solid welding;
The be placed in both sides up and down of two low-yield mild steel plates 21 of described two gusset plates 23, and the plate face of upside gusset plate 23 and the upper edge solid welding of two low-yield mild steel plates 21, the plate face of downside gusset plate 23 and the lower edge solid welding of two low-yield mild steel plates 21;
The put more energy into plate face of plate face, each gusset plate 23 of steel floor 22 of the plate face of described two low-yield mild steel plates 21 and each sidepiece is all vertical;
The plate face middle part of described low-yield mild steel plate 21 has an ellipse hole 24, and the minor axis of described ellipse hole 24 is parallel to the minor face of low-yield mild steel plate 21, and the length of its minor axis is smaller or equal to 0.7 times of low-yield mild steel plate 21 bond length.
Among the utility model second embodiment, the yield strength of described low-yield mild steel plate is smaller or equal to 235MPa, and its elongation per unit length is greater than 40%.
Among the utility model second embodiment, the ratio of the spacing between the spacing between the last lower edge of described low-yield mild steel plate and its edge, left and right sides is 0.5～2.
Among the utility model second embodiment, the through hole that the plate face of described low-yield mild steel plate 21 middle part is offered also can be runway shape or circle.
As shown in Figure 4, a kind of shearing-type that the utility model the 3rd embodiment is provided mild steel building structure aseismatic in parallel damper is characterized in that: comprise two rectangle low-yield mild steel plates 31, two sidepieces put more energy into steel floor 32 and two gusset plates 33;
The plate face of described two low-yield mild steel plates 31 is parallel to each other, and the surrounding is along flushing;
Described two sidepieces be placed in left and right sides of two low-yield mild steel plates 31 of steel floor 32 of putting more energy into, and the put more energy into left margin solid welding of plate face and two low-yield mild steel plates 31 of steel floor 32 of left side sidepiece, right side sidepiece are put more energy into the right of the plate face of steel floor 32 and two low-yield mild steel plates 31 along solid welding;
The be placed in both sides up and down of two low-yield mild steel plates 31 of described two gusset plates 33, and the plate face of upside gusset plate 33 and the upper edge solid welding of two low-yield mild steel plates 31, the plate face of downside gusset plate 33 and the lower edge solid welding of two low-yield mild steel plates 31;
The put more energy into plate face of plate face, each gusset plate 33 of steel floor 32 of the plate face of described two low-yield mild steel plates 31 and each sidepiece is all vertical;
The plate face of two low-yield mild steel plates 31 all is divided at least two daughter boards from top to bottom, and the daughter board quantity of two low-yield mild steel plates 31 is identical, all be welded with the level steel floor 35 of putting more energy between per two neighbouring daughter boards, described level puts more energy into that the plate face of steel floor 35 is parallel to the last lower edge of low-yield mild steel plate 31 and perpendicular to the plate face of low-yield mild steel plate 31.
The plate face middle part of every daughter board all has an ellipse hole 34, and the minor axis of described ellipse hole 34 is parallel to the minor face of daughter board, and the length of its minor axis is smaller or equal to 0.7 times of the daughter board bond length.
Among the utility model the 3rd embodiment, the yield strength of described low-yield mild steel plate is smaller or equal to 235MPa, and its elongation per unit length is greater than 40%.
Among the utility model the 3rd embodiment, the ratio of the spacing between the spacing between the last lower edge of described low-yield mild steel plate and its edge, left and right sides is 0.5～2.
Among the utility model the 3rd embodiment, the through hole that the plate face of every daughter board middle part is offered also can be runway shape or circle.
As shown in Figure 5, a kind of shearing-type that the utility model the 4th embodiment is provided mild steel building structure aseismatic in parallel damper is characterized in that: comprise two rectangle low-yield mild steel plates 41, two sidepieces put more energy into steel floor 42 and two gusset plates 43;
The plate face of described two low-yield mild steel plates 41 is parallel to each other, and the surrounding is along flushing;
Described two sidepieces be placed in left and right sides of two low-yield mild steel plates 41 of steel floor 42 of putting more energy into, and the put more energy into left margin solid welding of plate face and two low-yield mild steel plates 41 of steel floor 42 of left side sidepiece, right side sidepiece are put more energy into the right of the plate face of steel floor 42 and two low-yield mild steel plates 41 along solid welding;
The be placed in both sides up and down of two low-yield mild steel plates 41 of described two gusset plates 43, and the plate face of upside gusset plate 43 and the upper edge solid welding of two low-yield mild steel plates 41, the plate face of downside gusset plate 43 and the lower edge solid welding of two low-yield mild steel plates 41;
The put more energy into plate face of plate face, each gusset plate 43 of steel floor 42 of the plate face of described two low-yield mild steel plates 41 and each sidepiece is all vertical;
The plate face of two low-yield mild steel plates 41 all is divided at least two daughter boards from left to right, and the daughter board quantity of two low-yield mild steel plates is identical, all be welded with the steel floor 46 of vertically putting more energy between the adjacent daughter board in per two left and right sides, the plate face of the described steel floor 46 of vertically putting more energy into is parallel to the edge, the left and right sides of low-yield mild steel plate 41 and perpendicular to the plate face of low-yield mild steel plate 41.
The plate face middle part of every daughter board all has a runway shape through hole 44, the arc limit of the evagination of Kong Bianwei up and down of described runway shape through hole 44, and left and right sides Kong Bianwei straight flange, the spacing between the Kong Bian of its left and right sides is smaller or equal to 0.7 times of the daughter board bond length.
Among the utility model the 4th embodiment, the yield strength of described low-yield mild steel plate is smaller or equal to 235MPa, and its elongation per unit length is greater than 40%.
Among the utility model the 4th embodiment, the ratio of the spacing between the spacing between the last lower edge of described low-yield mild steel plate and its edge, left and right sides is 0.5～2.
Among the utility model the 4th embodiment, the through hole that the plate face of every daughter board middle part is offered also can be oval or circular.
As shown in Figure 6, a kind of shearing-type that the utility model the 5th embodiment is provided mild steel building structure aseismatic in parallel damper is characterized in that: comprise two rectangle low-yield mild steel plates 51, two sidepieces put more energy into steel floor 52 and two gusset plates 53;
The plate face of described two low-yield mild steel plates 51 is parallel to each other, and the surrounding is along flushing;
Described two sidepieces be placed in left and right sides of two low-yield mild steel plates 51 of steel floor 52 of putting more energy into, and the put more energy into left margin solid welding of plate face and two low-yield mild steel plates 51 of steel floor 52 of left side sidepiece, right side sidepiece are put more energy into the right of the plate face of steel floor 52 and two low-yield mild steel plates 51 along solid welding;
The be placed in both sides up and down of two low-yield mild steel plates 51 of described two gusset plates 53, and the plate face of upside gusset plate 53 and the upper edge solid welding of two low-yield mild steel plates 51, the plate face of downside gusset plate 53 and the lower edge solid welding of two low-yield mild steel plates 51;
The put more energy into plate face of plate face, each gusset plate 53 of steel floor 52 of the plate face of described two low-yield mild steel plates 51 and each sidepiece is all vertical;
The plate face of two low-yield mild steel plates 51 all is divided into the daughter board matrix (being divided into four in the present embodiment) of at least two row two row, and the daughter board matrix of two low-yield mild steel plates is identical, all be welded with the steel floor 56 of vertically putting more energy between the adjacent daughter board in per two row left and right sides, all be welded with the level steel floor 55 of putting more energy between the neighbouring daughter board of per two row, the plate face of the described steel floor 56 of vertically putting more energy into is parallel to the edge, the left and right sides of low-yield mild steel plate 51 and perpendicular to the plate face of low-yield mild steel plate 51, and described level puts more energy into that the plate face of steel floor 55 is parallel to the last lower edge of low-yield mild steel plate 51 and perpendicular to the plate face of low-yield mild steel plate 51.
Among the utility model the 5th embodiment, the yield strength of described low-yield mild steel plate is smaller or equal to 235MPa, and its elongation per unit length is greater than 40%.
Among the utility model the 5th embodiment, the ratio of the spacing between the spacing between the last lower edge of described low-yield mild steel plate and its edge, left and right sides is 0.5～2.
Among the utility model the 5th embodiment, the through hole that the plate face of every daughter board middle part is offered also can be runway shape or circle.
When each embodiment of the utility model uses, with the steel support and connection formation power consumption parts of lower node plate and building structure.Last gusset plate is connected with the beams and slabs of building structure,, can adopts welding or bolt to connect if building structure is steel work; If building structure is concrete structure, then connect by crab-bolt; The antidetonation principle of each embodiment of the utility model is as follows:
Little shake stage (being elastic stage), perforate rectangle low-yield mild steel plate can increase the structure lateral rigidity, reduces relative storey displacement; In the big shake stage (being elastic-plastic phase), the distortion of the hysteresis of perforate rectangle low-yield mild steel plate can earthquake energy, thus the main component of protection structure.
Claims (9)
1. shearing-type mild steel building structure aseismatic in parallel damper is characterized in that: comprise two rectangle low-yield mild steel plates, two sidepieces put more energy into steel floor and two gusset plates;
The plate face of described two low-yield mild steel plates is parallel to each other, and the surrounding is along flushing;
Described two sidepieces be placed in left and right sides of two low-yield mild steel plates of steel floor of putting more energy into, and the put more energy into left margin solid welding of plate face and two low-yield mild steel plates of steel floor of left side sidepiece, right side sidepiece are put more energy into the right of the plate face of steel floor and two low-yield mild steel plates along solid welding;
The be placed in both sides up and down of two low-yield mild steel plates of described two gusset plates, and the upper edge solid welding of the plate face of upside gusset plate and two low-yield mild steel plates, the plate face of downside gusset plate and the lower edge solid welding of two low-yield mild steel plates;
The put more energy into plate face of plate face, each gusset plate of steel floor of the plate face of described two low-yield mild steel plates and each sidepiece is all vertical.
2. shearing-type according to claim 1 mild steel building structure aseismatic in parallel damper, it is characterized in that: the ratio of the spacing between the spacing between the last lower edge of described low-yield mild steel plate and its edge, left and right sides is 0.5～2.
3. shearing-type according to claim 1 mild steel building structure aseismatic in parallel damper is characterized in that: the plate face middle part of described low-yield mild steel plate has a through hole.
4. shearing-type according to claim 3 mild steel building structure aseismatic in parallel damper, it is characterized in that: the through hole that the plate face middle part of described low-yield mild steel plate is offered is an ellipse hole, the minor axis of described ellipse hole is parallel to the minor face of low-yield mild steel plate, and the length of its minor axis is smaller or equal to 0.7 times of low-yield mild steel plate bond length.
5. shearing-type according to claim 1 mild steel building structure aseismatic in parallel damper, it is characterized in that: the plate face of two low-yield mild steel plates all is divided at least two daughter boards from top to bottom, and the daughter board quantity of two low-yield mild steel plates is identical, all be welded with the level steel floor of putting more energy between per two neighbouring daughter boards, described level puts more energy into that the plate face of steel floor is parallel to the last lower edge of low-yield mild steel plate and perpendicular to the plate face of low-yield mild steel plate.
6. shearing-type according to claim 1 mild steel building structure aseismatic in parallel damper, it is characterized in that: the plate face of two low-yield mild steel plates all is divided at least two daughter boards from left to right, and the daughter board quantity of two low-yield mild steel plates is identical, all be welded with the steel floor of vertically putting more energy between the adjacent daughter board in per two left and right sides, the plate face of the described steel floor of vertically putting more energy into is parallel to the edge, the left and right sides of low-yield mild steel plate and perpendicular to the plate face of low-yield mild steel plate.
7. shearing-type according to claim 1 mild steel building structure aseismatic in parallel damper, it is characterized in that: the plate face of two low-yield mild steel plates all is divided into the daughter board matrix of at least two row two row, and the daughter board matrix of two low-yield mild steel plates is identical, all be welded with the steel floor of vertically putting more energy between the adjacent daughter board in per two row left and right sides, all be welded with the level steel floor of putting more energy between the neighbouring daughter board of per two row, the plate face of the described steel floor of vertically putting more energy into is parallel to the edge, the left and right sides of low-yield mild steel plate and perpendicular to the plate face of low-yield mild steel plate, and described level puts more energy into that the plate face of steel floor is parallel to the last lower edge of low-yield mild steel plate and perpendicular to the plate face of low-yield mild steel plate.
8. according to claim 5,6 or 7 described shearing-types mild steel building structure aseismatic in parallel damper, it is characterized in that: the plate face middle part of every daughter board all has an ellipse hole, the minor axis of described ellipse hole is parallel to the minor face of daughter board, and the length of its minor axis is smaller or equal to 0.7 times of the daughter board bond length.
9. according to claim 5,6 or 7 described shearing-types mild steel building structure aseismatic in parallel damper, it is characterized in that: the plate face middle part of every daughter board all has a runway shape through hole, the arc limit of the evagination of Kong Bianwei up and down of described runway shape through hole, left and right sides Kong Bianwei straight flange, the spacing between the Kong Bian of its left and right sides is smaller or equal to 0.7 times of the daughter board bond length.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201749279U CN202090457U (en) | 2011-05-30 | 2011-05-30 | Shearing earthquake-resistant damper for architectural structure with mild steels in parallel |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2011201749279U CN202090457U (en) | 2011-05-30 | 2011-05-30 | Shearing earthquake-resistant damper for architectural structure with mild steels in parallel |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191822A (en) * | 2011-05-30 | 2011-09-21 | 上海建科结构新技术工程有限公司 | Shearing type parallel mild steel quake-proof damper for building structures |
| CN105971149A (en) * | 2016-08-03 | 2016-09-28 | 云南震安减震科技股份有限公司 | Assembled metal damper |
| CN110886403A (en) * | 2019-11-22 | 2020-03-17 | 山东彤创建筑科技有限公司 | Novel combined shearing bending damper |
-
2011
- 2011-05-30 CN CN2011201749279U patent/CN202090457U/en not_active Expired - Fee Related
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102191822A (en) * | 2011-05-30 | 2011-09-21 | 上海建科结构新技术工程有限公司 | Shearing type parallel mild steel quake-proof damper for building structures |
| CN105971149A (en) * | 2016-08-03 | 2016-09-28 | 云南震安减震科技股份有限公司 | Assembled metal damper |
| CN110886403A (en) * | 2019-11-22 | 2020-03-17 | 山东彤创建筑科技有限公司 | Novel combined shearing bending damper |
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Granted publication date: 20111228 Termination date: 20170530 |