CN113374107B - Rigidity-variable friction pendulum support - Google Patents
Rigidity-variable friction pendulum support Download PDFInfo
- Publication number
- CN113374107B CN113374107B CN202110738410.6A CN202110738410A CN113374107B CN 113374107 B CN113374107 B CN 113374107B CN 202110738410 A CN202110738410 A CN 202110738410A CN 113374107 B CN113374107 B CN 113374107B
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- steel plate
- steel sheet
- surface portion
- curved surface
- friction pendulum
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- 229910000831 Steel Inorganic materials 0.000 claims abstract description 99
- 239000010959 steel Substances 0.000 claims abstract description 99
- 230000005484 gravity Effects 0.000 claims abstract description 18
- 238000006073 displacement reaction Methods 0.000 claims description 15
- 230000035939 shock Effects 0.000 claims description 13
- 230000004044 response Effects 0.000 claims description 7
- 230000000694 effects Effects 0.000 claims description 3
- 238000002955 isolation Methods 0.000 description 6
- 238000009413 insulation Methods 0.000 description 3
- 230000009471 action Effects 0.000 description 2
- 230000003139 buffering effect Effects 0.000 description 2
- 230000009467 reduction Effects 0.000 description 2
- 238000011160 research Methods 0.000 description 2
- 229910001285 shape-memory alloy Inorganic materials 0.000 description 2
- 230000001133 acceleration Effects 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 239000000956 alloy Substances 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 230000007797 corrosion Effects 0.000 description 1
- 238000005260 corrosion Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005265 energy consumption Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052761 rare earth metal Inorganic materials 0.000 description 1
- 150000002910 rare earth metals Chemical class 0.000 description 1
- 238000011084 recovery Methods 0.000 description 1
- 238000006467 substitution reaction Methods 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
-
- 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
- E04B1/36—Bearings or like supports allowing movement
-
- 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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- Engineering & Computer Science (AREA)
- Architecture (AREA)
- Environmental & Geological Engineering (AREA)
- Civil Engineering (AREA)
- Structural Engineering (AREA)
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Business, Economics & Management (AREA)
- Emergency Management (AREA)
- Vibration Prevention Devices (AREA)
- Buildings Adapted To Withstand Abnormal External Influences (AREA)
Abstract
The invention discloses a rigidity-variable friction pendulum support which comprises an upper steel plate, a sliding block, a lower steel plate and an SMA cable, wherein the lower steel plate comprises a first steel plate and a second steel plate, the first steel plate is connected with the second steel plate, the second steel plate is provided with a curved surface part, the curved surface part comprises a small-radius spherical surface part and a gravity well curved surface part, the small-radius spherical surface part is positioned at the center of the gravity well curved surface part, the upper end of the sliding block is arranged on the upper steel plate, the lower end of the sliding block is arranged on the small-radius spherical surface part, and the upper steel plate is connected with the first steel plate through the SMA cable. The invention endows the support with self-resetting capability, endows the support with variable rigidity and can resist very rare vibration.
Description
Technical Field
The invention relates to the technical field of earthquake-proof design in civil engineering, in particular to a rigidity-variable friction pendulum support.
Background
The Chinese fifth generation earthquake motion parameter demarcation map GB18306-2015 presents extremely rare earthquake motion, and higher requirements on the earthquake resistance of the structure are provided. Under the background, development of a shock insulation support with strong shock resistance and self-recovery after a shock is urgently needed.
Through setting the curved surface of polynomial, a friction pendulum vibration isolation support with 6 times polynomial curved surfaces has been proposed, and performance targets under different levels can be met. However, they indicate that this design does not take into account the very rare shock, which would lead to a dramatic increase in acceleration response, if considered, the design surface should be modified. Through three batches of SMA (ShapeMmemory Alloy, super elastic shape memory alloy) ropes that tighten in proper order, multi-stage fortification SMA lead core support has been proposed in addition, can improve the shock insulation efficiency of support during medium and small earthquake, can effectively restrict the support displacement under the strong earthquake effect during strong earthquake, but can cause the increase of the internal force of structure. Through early friction support sliding and later relaxation SMA cable tensioning, still have proposed the shock insulation support of hierarchical fortification. In the prior art, a three-stage design variable curvature friction pendulum vibration isolation support is also proposed, the restoring force of the first stage and the second stage is respectively provided by a friction surface in a parabolic curve and an exponential curve, and the restoring force of the third stage is provided by the friction surface and a tensioned SMA wire. Researches show that the negative stiffness device has an active control effect and can effectively reduce the internal force of the structure. The advantages of the SMA member and the negative stiffness device are combined, and an SMA negative stiffness damping device exists in the prior art, wherein the negative stiffness is provided by a reverse double spherical surface, and the self-resetting capability is provided by an annular SMA cable. Theoretical and experimental researches show that the device can effectively reduce the internal force response of the structure under strong shock. However, the existing variable-rigidity self-resetting vibration isolation device is not designed to take very rare earthquake vibration into consideration. In rare cases of shock, the internal force and displacement response of the structures employing these devices is excessive and there is a high likelihood of failure.
Disclosure of Invention
The invention aims to overcome the defect that the vibration isolation device is not designed to take very rarely vibration into consideration, and provides a variable-rigidity friction pendulum support.
The aim of the invention is achieved by the following technical scheme: the utility model provides a become rigidity friction pendulum support, includes steel sheet, slider, lower steel sheet and SMA cable, the lower steel sheet includes first steel sheet and second steel sheet, first steel sheet is connected with the second steel sheet, the second steel sheet is equipped with curved surface portion, curved surface portion includes small radius spherical surface portion and gravity well curved surface portion, small radius spherical surface portion is located the center of gravity well curved surface portion, the upper end of slider is installed in last steel sheet, the lower extreme of slider is installed in small radius spherical surface portion, it is connected with first steel sheet that the upper steel sheet passes through the SMA cable.
More preferably, the upper steel plate comprises a third steel plate, a fourth steel plate and a limiting block which are sequentially connected, the limiting block is provided with a spherical groove, the upper end of the sliding block is arranged in the spherical groove, and the third steel plate is connected with the first steel plate through an SMA cable.
More preferably, the sliding block comprises a first hemispherical part, a connecting part and a second hemispherical part which are sequentially connected, wherein the first hemispherical part is arranged on the upper steel plate, and the second hemispherical part is arranged on the small-radius spherical part.
More preferably, the radius of the small radius spherical surface part is 1-3m.
More preferably, one end of the SMA rope is connected with the upper steel plate through a U-shaped hoop.
More preferably, the other end of the SMA rope is connected with the second steel plate through a U-shaped hoop.
Compared with the prior art, the invention has the following advantages:
1. According to the invention, the self-resetting capability of the support is endowed by the upper steel plate, the sliding block, the lower steel plate and the SMA cable, the small-radius spherical surface part can be better self-resetting capability under small and medium vibration, and the super-elastic SMA cable can be used for providing better self-resetting capability under strong vibration; under the action of strong vibration, the gravity well curved surface can convert a vertical deformation path (warp direction) into a track running path (weft direction) in a horizontal plane, so that not only can the internal force transmitted to the lower structure be reduced, but also the displacement response (because it converts one-dimensional displacement into two-dimensional displacement) can be reduced, in addition, the running distance along the track is longer than the vertical deformation length, and the sliding block can rub and dissipate more energy; the bridge pier Liang Jianwei can resist rare earth vibration, and under rare earthquakes, the SMA cable is tensioned, so that the maximum displacement of the vibration reduction and isolation support can be effectively limited, the pier Liang Jianwei is reduced, and the occurrence of beam falling vibration damage is effectively prevented.
Drawings
FIG. 1 is a schematic illustration of a variable stiffness friction pendulum mount of the present invention;
FIG. 2 is a schematic view of an upper steel plate of a variable stiffness friction pendulum support of the present invention;
FIG. 3 is a schematic illustration of a slider of a variable stiffness friction pendulum mount of the present invention;
FIG. 4 is a schematic view of a lower steel plate of a variable stiffness friction pendulum support of the present invention;
FIG. 5 is a force analysis diagram of a variable stiffness friction pendulum mount of the present invention;
the reference numerals for the various parts in the drawings: 1. a steel plate is arranged; 11. a third steel plate; 12. a fourth steel plate; 13. a limiting block; 131. a spherical groove; 2. a slide block; 21. a first hemispherical portion; 22. a connection part; 23. a second hemispherical portion; 3. a lower steel plate; 31. a first steel plate; 32. a second steel plate; 33. a curved surface portion; 331. a small radius spherical surface portion; 332. gravity well curvature; 4. an SMA cable; 5. a U-shaped hoop.
Detailed Description
The present invention will be described in further detail with reference to the drawings and specific examples, which are not to be construed as limiting the embodiments of the present invention.
As shown in fig. 1, the variable-rigidity friction pendulum support comprises an upper steel plate 1, a sliding block 2, a lower steel plate 3 and an SMA rope 4, wherein the upper steel plate 1 is connected with the lower steel plate 3 through the sliding block 2, a plurality of screw holes are formed in the edge of the upper steel plate 1 and the edge of the lower steel plate 3, a U-shaped hoop 5 is arranged on the screw holes, one end of the SMA rope 4 is connected with the upper steel plate 1 through the U-shaped hoop 5, and the other end of the SMA rope 4 is connected with the lower steel plate 3 through the U-shaped hoop 5. The support in this embodiment adapts to the requirements of different fortification targets under different earthquake motion levels. Under the action of small and medium vibration, the rigidity of the bearing is consistent with that of the small-radius spherical friction pendulum support, and the self-resetting capability is strong; under strong shock, the gravity well curved surface portion 332 can convert the vertical deformation path (warp direction) into the orbit running path (weft direction) in the horizontal plane, and not only can reduce the internal force transmitted to the lower structure, but also can reduce the displacement response (because it converts the one-dimensional displacement into the two-dimensional displacement). Furthermore, the sliding block 2 will rub to dissipate more energy along the track over a longer travel distance than the vertical deformation length.
The upper steel plate 1 is used for bearing gravity and also used for buffering earthquakes. The slide block 2 plays a role in buffering, the upper steel plate 1 can incline at different angles relative to the lower steel plate 3, and the influence caused by earthquake is buffered. The lower steel plate 3 plays a supporting role, and can provide restoring force and reduce the influence of internal force and displacement of the structure. The SMA rope 4 (shape memory alloy rope) is used as a novel intelligent material and has the advantages of large strain, recoverable deformation, extra energy consumption, fatigue resistance, good corrosion resistance and the like. In this embodiment, the SMA cable 4 can limit the displacement of the upper steel plate 1 under strong shock, and can provide better self-resetting capability under strong shock. In rare earthquakes, the SMA cable 4 is tensioned, so that the maximum displacement of the seismic reduction and isolation support can be effectively limited, the pier Liang Jianwei is reduced, and the occurrence of beam falling vibration damage is effectively prevented. The U-shaped hoop 5 is used to fix the SMA wire 4 to the upper and lower steel plates 1 and 3, so that the SMA wire 4 can be prevented from sliding due to the tensile force.
As shown in fig. 2, the upper steel plate 1 includes a third steel plate 11, a fourth steel plate 12 and a limiting block 13, the fourth steel plate 12 is installed in the middle of the third steel plate 11, the limiting block 13 is installed in the middle of the fourth steel plate 12, the limiting block 13 is provided with a spherical groove 131, the upper end of the sliding block 2 is installed in the spherical groove 131, a plurality of evenly distributed screw holes are formed in the edge of the third steel plate 11, a plurality of U-shaped hoops 5 are installed on the screw holes, and one end of the SMA cable 4 is fixed on the U-shaped hoops 5.
The third steel plate 11 is used for fixing the SMA rope 4; the fourth steel plate 12 is used for connecting the third steel plate 11 and the limiting block 13; the limiting block 13 is matched with the first half ball part 21 of the sliding block 2 through the spherical groove 131, so that the upper steel plate 1 can rotate at different angles relative to the first half ball part 21.
As shown in fig. 3, the slider 2 includes a first hemispherical portion 21, a connecting portion 22, and a second hemispherical portion 23, the upper end of the connecting portion 22 is connected to the first hemispherical portion 21, and the lower end of the connecting portion 22 is connected to the second hemispherical portion 23. The first hemispherical portion 21 is mounted on the spherical recess 131 of the upper steel plate 1, and the second hemispherical portion 23 is mounted on the small radius spherical portion 331 of the lower steel plate 3.
The first hemispherical part 21 and the limiting block 13 of the upper steel plate 1 can rotate relatively; the connection part 22 controls the distance between the upper steel plate 1 and the lower steel plate 3; the second hemispherical portion 23 is rotatable relative to the small radius spherical portion 331 of the lower steel plate 3.
As shown in fig. 4, the lower steel plate 3 includes a first steel plate 31 and a second steel plate 32, the top of the first steel plate 31 is connected with the bottom of the second steel plate 32, the top of the second steel plate 32 is provided with a curved surface portion 33, the curved surface portion 33 includes a small radius spherical surface portion 331 and a gravity well curved surface portion 332, the small radius spherical surface portion 331 is located at the center position of the gravity well curved surface portion 332, the radius of the small radius spherical surface portion 331 is 1-3m, the second hemispherical portion 23 of the slider 2 is installed in the small radius spherical surface portion 331, the edge of the first steel plate 31 is provided with a plurality of symmetrical screw holes, the U-shaped hoop 5 is installed on the screw holes through nuts, and the other end of the SMA cable 4 is fixed on the U-shaped hoop 5.
The first steel plate 31 is used for fixedly connecting the SMA rope 4; the second steel plate 32 is provided with a small-radius spherical surface part 331 and a gravity well curved surface part 332, the small-radius spherical surface part 331 has better self-resetting capability under small and medium shocks, the gravity well curved surface part 332 converts the running track of the sliding block 2 from one-dimensional vertical to horizontal two-dimensional track running, and the internal force and displacement response of the structure are reduced.
As shown in fig. 5, in the curve profile and the slide stress analysis chart, R is the radius of the small radius spherical surface portion 331, F is the horizontal force, P is the vertical force, N is the reaction force of the small radius spherical surface portion 331 to the slide, F f is the friction force between the small radius spherical surface portion 331 and the slide 2, θ is the intersection of the small radius spherical surface portion 331 and the gravity well curve surface portion 332, and the angle between the tangent line of the small radius spherical surface portion 331 and the horizontal line. The distance x 0 between the variable slope points of the small radius spherical surface part 331 and the gravity well curved surface part 332 and the axis of the gravity well and the parameters of the loose SMA cable are required to be determined according to the displacement of the structure under different earthquake motion levels. The first derivative continuity of the contour line needs to be met at the slope changing point.
The above embodiments are preferred examples of the present invention, and the present invention is not limited thereto, and any other modifications or equivalent substitutions made without departing from the technical aspects of the present invention are included in the scope of the present invention. .
Claims (6)
1. The utility model provides a become rigidity friction pendulum support, its characterized in that includes upper steel sheet, slider, lower steel sheet and SMA cable, lower steel sheet includes first steel sheet and second steel sheet, first steel sheet is connected with the second steel sheet, the second steel sheet is equipped with curved surface portion, curved surface portion includes small radius spherical surface portion and gravity well curved surface portion, small radius spherical surface portion is located gravity well curved surface portion's center, the upper end of slider is installed in upper steel sheet, the lower extreme of slider is installed in small radius spherical surface portion, upper steel sheet passes through the SMA cable and is connected with first steel sheet;
Under the strong shock effect, gravity well curved surface portion converts vertical deformation route into the track operation route in the horizontal plane to reduce the internal force that transmits to the substructure and reduce displacement response, the travel distance of slider along the track is greater than vertical deformation length, the slider can more energy of friction dissipation.
2. The variable stiffness friction pendulum support according to claim 1, wherein the upper steel plate comprises a third steel plate, a fourth steel plate and a limiting block which are sequentially connected, the limiting block is provided with a spherical groove, the upper end of the sliding block is mounted in the spherical groove, and the third steel plate is connected with the first steel plate through an SMA cable.
3. The variable stiffness friction pendulum support of claim 1, wherein the slider comprises a first hemispherical portion, a connecting portion and a second hemispherical portion, wherein the first hemispherical portion is mounted on the upper steel plate, and the second hemispherical portion is mounted on the small-radius spherical portion.
4. A variable stiffness friction pendulum mount according to claim 1 wherein said small radius spherical segment has a radius of 1-3m.
5. A variable stiffness friction pendulum support according to claim 1 wherein one end of said SMA wire is connected to the upper steel plate by a U-shaped collar.
6. A variable stiffness friction pendulum support according to claim 1 wherein the other end of the SMA wire is connected to the second steel plate by a U-shaped collar.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110738410.6A CN113374107B (en) | 2021-06-30 | 2021-06-30 | Rigidity-variable friction pendulum support |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110738410.6A CN113374107B (en) | 2021-06-30 | 2021-06-30 | Rigidity-variable friction pendulum support |
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| Publication Number | Publication Date |
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| CN113374107A CN113374107A (en) | 2021-09-10 |
| CN113374107B true CN113374107B (en) | 2024-05-24 |
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| CN202110738410.6A Active CN113374107B (en) | 2021-06-30 | 2021-06-30 | Rigidity-variable friction pendulum support |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| WO2023108301A1 (en) * | 2021-12-17 | 2023-06-22 | The Governors Of The University Of Alberta | Smart friction pendulum system |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| WO1995023267A1 (en) * | 1994-02-28 | 1995-08-31 | Wilhelmus Adrianus Van Parera | Apparatus for protecting structures, constructions and the like against earthquakes |
| WO2011152690A2 (en) * | 2010-06-04 | 2011-12-08 | Je Hee Mun | Seismic isolation device responding to earthquake having at least certain intensity |
| CN106320555A (en) * | 2016-10-14 | 2017-01-11 | 智性科技南通有限公司 | Friction pendulum isolation bearing with variable curvature |
| CN109898681A (en) * | 2019-03-29 | 2019-06-18 | 华中科技大学 | A kind of high-bearing capacity tension energy consumption earthquake isolating equipment |
| CN211115079U (en) * | 2019-08-06 | 2020-07-28 | 华中科技大学 | Friction pendulum energy dissipation and shock isolation device with multistage overturn prevention function |
| CN215716202U (en) * | 2021-06-30 | 2022-02-01 | 广州大学 | Variable-rigidity friction pendulum support |
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| US6572071B1 (en) * | 2001-11-16 | 2003-06-03 | Chung-Shien Tsai | Shock eliminator |
| US20070044395A1 (en) * | 2005-08-24 | 2007-03-01 | Lyan-Ywan Lu | Seismic isolator with variable curvature |
| US8484911B2 (en) * | 2006-05-12 | 2013-07-16 | Earthquake Protection Systems, Inc. | Sliding pendulum seismic isolation system |
| KR20080090744A (en) * | 2007-04-06 | 2008-10-09 | 한양대학교 산학협력단 | Friction pendulum system |
| CN107916619A (en) * | 2017-11-16 | 2018-04-17 | 北京工业大学 | Consume energy spacing sliding friction shock isolating pedestal |
| CN107761556B (en) * | 2017-11-16 | 2020-07-31 | 北京工业大学 | Energy-consumption limiting variable-curvature sliding friction shock-insulation support |
| KR20190002725U (en) * | 2018-04-23 | 2019-10-31 | 박재원 | Pendulum Stick Slip |
| JP6628923B1 (en) * | 2019-05-23 | 2020-01-15 | 日鉄エンジニアリング株式会社 | Sliding seismic isolation device |
| CN110258813B (en) * | 2019-06-30 | 2021-04-20 | 华中科技大学 | High-bearing-capacity tensile shock isolation device with bidirectional sliding support |
| CN110685368A (en) * | 2019-10-17 | 2020-01-14 | 北京建筑大学 | Multidimensional control SMA-complex friction pendulum shock isolation system |
| CN115710981A (en) * | 2022-11-28 | 2023-02-24 | 华中科技大学 | SMA-negative stiffness friction pendulum support with limiting function |
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2021
- 2021-06-30 CN CN202110738410.6A patent/CN113374107B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO1995023267A1 (en) * | 1994-02-28 | 1995-08-31 | Wilhelmus Adrianus Van Parera | Apparatus for protecting structures, constructions and the like against earthquakes |
| WO2011152690A2 (en) * | 2010-06-04 | 2011-12-08 | Je Hee Mun | Seismic isolation device responding to earthquake having at least certain intensity |
| CN106320555A (en) * | 2016-10-14 | 2017-01-11 | 智性科技南通有限公司 | Friction pendulum isolation bearing with variable curvature |
| CN109898681A (en) * | 2019-03-29 | 2019-06-18 | 华中科技大学 | A kind of high-bearing capacity tension energy consumption earthquake isolating equipment |
| CN211115079U (en) * | 2019-08-06 | 2020-07-28 | 华中科技大学 | Friction pendulum energy dissipation and shock isolation device with multistage overturn prevention function |
| CN215716202U (en) * | 2021-06-30 | 2022-02-01 | 广州大学 | Variable-rigidity friction pendulum support |
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| CN113374107A (en) | 2021-09-10 |
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