CN113417502A - Double-yield-point buckling restrained brace - Google Patents
Double-yield-point buckling restrained brace Download PDFInfo
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- CN113417502A CN113417502A CN202110856782.9A CN202110856782A CN113417502A CN 113417502 A CN113417502 A CN 113417502A CN 202110856782 A CN202110856782 A CN 202110856782A CN 113417502 A CN113417502 A CN 113417502A
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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
- 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 utility model provides a two yield point buckling restrained brace, includes the body, and the body includes the linkage unit at core unit, outer constraint unit, unbonded slip mechanism unit and both ends, and the core unit includes the compoboard of surging stage by stage, and the compoboard of surging stage by stage includes first surging steel sheet and second surging steel sheet, and outer constraint unit includes overcoat steel pipe and filler, and unbonded slip mechanism unit sets up between core unit and filler, linkage unit fixed connection is in the outside of the first linkage segment and the second linkage segment of joining region. The buckling restrained brace comprises two yielding sections, the buckling restrained brace is provided with two yielding points through the structure, energy consumption can be achieved through yielding under a small earthquake, the structural deformation is increased along with the increase of the earthquake action, and when the earthquake reaches a medium earthquake or a large earthquake, the second yielding section enters a working state, so that the requirement of the earthquake-resistant performance design of the structure is well met.
Description
Technical Field
The invention relates to a structural anti-seismic component, in particular to a buckling restrained brace with staged yielding.
Background
The buckling restrained brace is composed of a core energy consumption section and an outer-coated restraining component, when the core energy consumption section bears axial pressure, the outer-coated restraining unit is used for restraining the transverse deformation of the core energy consumption section, buckling of the core energy consumption section is prevented, the core energy consumption section can be subjected to full-section yielding under the action of axial force, and symmetrical stress performance is obtained in the stretching and compressing directions. The buckling restrained brace has the characteristics of clear damping mechanism, obvious damping effect, safety, reliability, economy and reasonability, and can meet the anti-seismic requirements of different structures. Under the normal use state and the action of small earthquake, the buckling restrained brace provides lateral stiffness for the building structure, and plays a role of common bracing; under the action of a large earthquake, the buckling restrained brace can dissipate the energy input by the earthquake through repeated pulling and pressing hysteresis.
The buckling restrained brace has the advantages that the energy consumption section is a main stress unit and is generally made of steel with a low yield point, the restraining unit provides a restraining mechanism to prevent the energy consumption unit from being unstable integrally or buckling locally when being pressed, the energy consumption section can be made of steel pipe concrete, a steel concrete outer sleeve, a circular or polygonal steel pipe and the like, and an unbonded material provides a sliding interface between the energy consumption unit and the restraining unit, so that the buckling restrained brace has similar mechanical properties when being pulled and pressed as much as possible, and the increase of axial force caused by friction between the energy consumption unit and the restraining unit after being pressed and expanded is avoided. In general, the buckling-restrained energy-dissipation brace only has one yielding section, does not yield under the action of a frequent earthquake, only provides additional rigidity, does not participate in energy dissipation, and provides additional rigidity and additional damping under the action of a rare earthquake.
In recent years, some researchers begin to develop a staged yielding buckling restrained brace, one part of the yielding restrained brace firstly yields and consumes energy under a small earthquake, and most of the yielding restrained brace yields and consumes energy under a medium earthquake or a large earthquake, so that the energy consumption capability of the yielding restrained brace for resisting earthquakes with different strengths is effectively improved. The existing implementation method of the staged energy consumption buckling restrained brace comprises the combination of dampers with different energy consumption mechanisms and the combination of dampers with different energy consumption materials. For example, Oucault indica et al sets a friction damper between a sleeve and a connecting section of a common buckling restrained brace, the friction damper and an energy dissipation section of the buckling restrained brace are in a parallel connection relationship to form a composite energy dissipater yielding in stages, because the rigidity of the energy dissipation section of the buckling restrained brace is far greater than the initial rigidity of the friction damper, the buckling restrained brace bears more axial force, and because the rigidity of the friction damper is smaller, the axial force shared by the friction damper is limited, thereby influencing the energy dissipation effect of the friction damper under a small earthquake; the method that the energy consumption sections with low yield points and the energy consumption sections with high yield points are connected in parallel is adopted by Malua and the like, the problems are also caused, the rigidity of the energy consumption section with high yield points is much higher than that of the energy consumption section with low yield points, so that the energy consumption of the energy consumption section with low yield points is greatly influenced, and the staged yield cannot be well realized.
Disclosure of Invention
The invention aims to provide a double-yield-point buckling restrained brace, and aims to solve the technical problems that the rigidity of an energy consumption section with a high yield point of the existing staged yielding buckling restrained brace is higher than that of an energy consumption section with a low yield point, so that the energy consumption of the energy consumption section with the low yield point is greatly influenced, and staged yielding cannot be really realized.
In order to achieve the purpose, the invention adopts the following technical scheme:
a double-yield-point buckling restrained brace comprises a body, wherein the body comprises a core unit, an outer restraining unit, an unbonded sliding mechanism unit and connecting units at two ends,
the core unit comprises a staged yielding combined plate, the staged yielding combined plate comprises a first yielding steel plate and a second yielding steel plate which are arranged in the front and back middle and are oppositely attached and fixedly connected, the thickness of the first yielding steel plate is smaller than that of the second yielding steel plate, the first yielding steel plate and the second yielding steel plate are both steel plates with straight cross sections,
the stress area of the body is divided into a core area at the middle part, transition areas at two sides of the core area and connecting areas at the outer sides of the transition areas along the longitudinal direction,
the first yield steel plate comprises a first core section positioned in the core area, a first transition section positioned in the transition area and a first connecting section positioned in the connecting area,
the second yield steel plate comprises a second core section positioned in the core area, a second transition section positioned in the transition area and a second connecting section positioned in the connecting area,
the length of the first core segment is longer than the length of the second core segment,
the external constraint unit comprises an outer sleeve steel pipe sleeved outside the core unit and also comprises a filling material filled between the outer sleeve steel pipe and the core unit, the unbonded sliding mechanism unit is arranged between the core unit and the filling material,
the connecting unit is fixedly connected to the outer sides of the first connecting section and the second connecting section of the connecting area.
The first yield steel plate and the second yield steel plate have the same length.
The plate width of the first core section is smaller than that of the second core section, and the plate widths of the first connecting section and the second connecting section are the same.
The first connecting section has a plate width greater than that of the first core section, and the first transition section smoothly transitions between the first core section and the first connecting section.
The second connecting section has a plate width greater than that of the second core section, and the second transition section smoothly transitions between the second core section and the second connecting section.
The cross section of the outer sleeved steel pipe is rectangular.
The filler is the concrete, the unbonded slip mechanism unit is the unbonded coating that the core unit surface set up, still be equipped with one deck slidable material between first yield steel sheet and the second yield steel sheet, slidable material is polytetrafluoroethylene.
The edge of the outer sleeved steel pipe is aligned with the outer edge of the first transition section.
The connecting unit comprises a connecting assembly, the connecting assembly comprises a connecting assembly plate and a connecting bolt, the connecting group plate comprises two parallel clamping plates which are clamped at the outer sides of the first connecting section and the second connecting section, a group of bolt holes for connecting bolts to pass through are arranged on the clamping plates, the bolt hole is also provided with a corresponding first connecting hole and a corresponding second connecting hole at the positions corresponding to the first connecting section and the second connecting section, the first connecting holes, the second connecting holes and the bolt holes are aligned one by one and are bolted through connecting bolts, the connecting group plate also comprises a limiting plate which is vertically and fixedly connected with the outer side of the clamping plate, the outer end surface of the first connecting section and the outer end surface of the second connecting plate are tightly attached to the inner side surface of the limiting plate, the connecting plate set further comprises an ear plate fixedly connected to the outer side of the limiting plate in the middle, and the ear plate is parallel to the staged yielding combination plate and provided with an ear plate hole.
The first connecting hole and the second connecting hole are round holes, or the first connecting hole is a round hole, the second connecting hole is a long round hole, or the first connecting hole is a long round hole, the second connecting hole is a round hole, or the first connecting hole and the second connecting hole (24) are long round holes.
Compared with the prior art, the invention has the following characteristics and beneficial effects:
the invention provides a buckling restrained brace with two yield sections, the novel buckling restrained brace is provided with two yield points through a structure, the buckling restrained brace can be subjected to yielding energy consumption under a small earthquake, the structural deformation is increased along with the increase of the earthquake action, and when the structure reaches a medium earthquake or a large earthquake, the second yield section enters a working state, so that the requirement of the seismic performance design of the structure is well met.
The first yielding section has a longer core section, smaller thickness, smaller axial rigidity, and larger yielding displacement and ultimate displacement; the second yielding section core section is shorter than the first yielding section, larger in thickness, large in axial rigidity, and smaller in yielding displacement and ultimate displacement.
The working principle is as follows:
under the action of small vibration: the first yielding section core section firstly enters yielding energy consumption, and the second yielding section core section does not enter a working state due to the release effect of the long round bolt hole, so that the energy dissipation effect of the first yielding section core section is not influenced.
Under the action of medium or large earthquake: the interlayer horizontal deformation ratio of the structure is remarkably increased under small earthquake, the length released by the long round bolt hole is reached or exceeded, the second yielding section core section enters a working state, axial deformation energy dissipation is generated, and the rigidity and the bearing capacity of the second yielding section core section are remarkably higher than those of the first yielding section core section, so that the increase of earthquake action and the energy dissipation requirement of the structure are well adapted, and the energy dissipation function is jointly played with the first yielding section core section.
The first yielding section core section has larger ultimate displacement, so the first yielding section core section can normally work under the condition of large shock, and the requirement of ultimate deformation is easily met; the ultimate displacement of the second yielding section core section is smaller, but the yielding energy dissipation starts under the medium or large earthquake, and the requirement of ultimate deformation is easily met.
The double-yield-point buckling restrained brace well utilizes the energy dissipation mechanism and product characteristics of the buckling restrained brace, is suitable for gradual increase of earthquake action, is well suitable for structural grading performance design, and is a shock absorption product with excellent performance.
Drawings
The present invention will be described in further detail with reference to the accompanying drawings.
Fig. 1 is a schematic structural view of the present invention.
Fig. 2 is a schematic longitudinal side view of the structure of fig. 1.
Fig. 3 is another longitudinal side view of the structure of fig. 2.
Fig. 4 is a schematic structural view of the core unit and the connection unit of fig. 3.
Fig. 5 is a coupling disassembled view of the core unit and the coupling unit of fig. 4.
Fig. 6 is a structural view of the first yield steel plate.
Fig. 7 is a structural view of a second yield steel plate.
Fig. 8 is a schematic structural view of a section a-a in fig. 2.
Fig. 9 is a schematic structural view of a section B-B in fig. 2.
Fig. 10 is a schematic view of the structure of the connection plate.
Fig. 11 is a disassembled structural schematic view of the present invention.
Reference numerals: 1-a first yield steel plate, 11-a first core section, 12-a first transition section, 13-a first connecting section, 14-a first connecting hole, 2-a second yield steel plate, 21-a second core section, 22-a second transition section, 23-a second connecting section, 24-a second connecting hole, 3-an external constraint unit, 31-an outer steel tube, 32-a filler, 4-a connecting unit, 41-a clamping plate, 42-a limiting plate, 43-an ear plate, 44-an ear plate hole, 5-a connecting bolt, 6-a bolt hole, 7-a core unit and 8-a slidable material.
Detailed Description
Examples referring to fig. 1-5 and 11, a dual yield point buckling restrained brace comprises a body including a core unit 7, an outer restraining unit 3, an unbonded sliding mechanism unit and a connecting unit 4.
The core unit 7 comprises a staged yielding combined plate, the staged yielding combined plate comprises a first yielding steel plate 1 and a second yielding steel plate 2 which are arranged in the front and back, centered, just opposite to each other, tightly attached to each other and fixedly connected with each other, the thickness of the first yielding steel plate 1 is smaller than that of the second yielding steel plate 2, and the first yielding steel plate 1 and the second yielding steel plate 2 are both steel plates with straight cross sections.
The stress area of the body is divided into a core area at the middle part, transition areas at two sides of the core area and connecting areas at the outer sides of the transition areas along the longitudinal direction,
referring to fig. 6, the first yield steel plate 1 includes a first core section 11 at a core region, a first transition section 12 at a transition region, and a first connection section 13 at a connection region,
referring to fig. 7, the second yield steel plate 2 includes a second core section 21 at the core region, a second transition section 22 at the transition region and a second connection section 23 at the connection region,
the length of the first core section 11 is longer than the length of the second core section 21.
The external restraint unit 3 comprises an outer sleeve steel pipe 31 sleeved outside the core unit, and also comprises a filling material 32 filled between the outer sleeve steel pipe 31 and the core unit, and the unbonded sliding mechanism unit is arranged between the core unit and the filling material 32.
The connection unit 4 is fixedly connected to the outside of the first and second connection sections 13 and 23 of the connection area.
The first yield steel plate 1 and the second yield steel plate 2 have the same length. The plate width of the first core section 11 is smaller than that of the second core section 21, and the plate widths of the first connecting section 13 and the second connecting section 23 are the same. The first connecting section 13 has a plate width larger than that of the first core section 11, and the first transition section 12 smoothly transitions between the first core section 11 and the first connecting section 13. The second connecting section 23 has a plate width larger than that of the second core section 21, and the second transition section 22 smoothly transitions between the second core section 21 and the second connecting section 23.
Referring to fig. 8-9, the cross-sectional shape of the outer sleeved steel pipe 31 is rectangular, the filler 32 is concrete, the unbonded sliding mechanism unit is an unbonded coating arranged on the outer surface of the core unit, a layer of slidable material is further arranged between the first yielding steel plate 1 and the second yielding steel plate 2, the width of the slidable material is not more than that of the first core section 11, the end of the slidable material does not exceed the outer edge of the first transition section 12, and the slidable material is polytetrafluoroethylene. The edge of the outer jacket steel tube 31 is aligned with the outer edge of the first transition section 12. The slidable material can further ensure the independence of two sections of yielding of the core unit.
Referring to fig. 5 and 10, the connection unit 4 includes a connection assembly including a connection assembly plate and a connection bolt 5, the connection assembly plate includes two parallel clamp plates 41 clamped outside the first connection section 13 and the second connection section 23, a set of bolt holes 6 for the connection bolt 5 to pass through is opened on the clamp plate 41, corresponding first connection holes 14 and second connection holes 24 are also opened on positions of the bolt holes 6 corresponding to the first connection section 13 and the second connection section 23, the first connection holes 14, the second connection holes 24 and the bolt holes 6 are aligned one by one and bolted through the connection bolt 5, the connection assembly plate further includes a limit plate 42 vertically and fixedly connected outside the clamp plate, an outer side end surface of the first connection section 13 and an outer side end surface of the second connection plate 23 are tightly attached to an inner side surface of the limit plate 42, the connection assembly plate further includes an ear plate 43 fixedly connected outside the limit plate 42 in the middle, the lug plate 43 is parallel to the staged yielding composite plate and has a lug plate hole 44 formed therein.
In this embodiment, the plate body width of the clamping plate 41 is equal to the width of the first connecting section 13 and the second connecting section 23, the limiting plate 42 is a circular plate and is fixedly connected to the outer side of the clamping plate in the middle, and the connecting bolts 5 are calculated according to the design, and six are arranged on each side in this example.
Claims (10)
1. The utility model provides a two yield point buckling restrained brace, includes the body, its characterized in that: the body comprises a core unit (7), an external constraint unit (3), an unbonded sliding mechanism unit and connecting units (4) at two ends,
the core unit (7) comprises a staged yield combination plate, the staged yield combination plate comprises a first yield steel plate (1) and a second yield steel plate (2) which are arranged in the front and back, are centered, are opposite to each other, are tightly attached and are fixedly connected, the thickness of the first yield steel plate (1) is smaller than that of the second yield steel plate (2), the first yield steel plate (1) and the second yield steel plate (2) are both steel plates with straight cross sections,
the stress area of the body is divided into a core area at the middle part, transition areas at two sides of the core area and connecting areas at the outer sides of the transition areas along the longitudinal direction,
the first yield steel plate (1) comprises a first core section (11) positioned in the core area, a first transition section (12) positioned in the transition area and a first connecting section (13) positioned in the connecting area,
the second yield steel plate (2) comprises a second core section (21) positioned in the core area, a second transition section (22) positioned in the transition area and a second connecting section (23) positioned in the connecting area,
the length of the first core segment (11) is longer than the length of the second core segment (21),
the outer constraint unit (3) comprises an outer sleeve steel pipe (31) sleeved on the outer side of the core unit, and further comprises a filling material (32) filled between the outer sleeve steel pipe (31) and the core unit, the unbonded sliding mechanism unit is arranged between the core unit and the filling material (32), and the connecting unit (4) is fixedly connected to the outer sides of the first connecting section (13) and the second connecting section (23) of the connecting area.
2. The dual yield point buckling restrained brace of claim 1, wherein: the first yield steel plate (1) and the second yield steel plate (2) are the same in length.
3. The dual yield point buckling restrained brace of claim 1, wherein: the plate width of the first core section (11) is smaller than that of the second core section (21), and the plate widths of the first connecting section (13) and the second connecting section (23) are the same.
4. The dual yield point buckling restrained brace of claim 1, wherein: the first connecting section (13) has a plate width greater than that of the first core section (11), and the first transition section (12) smoothly transitions between the first core section (11) and the first connecting section (13).
5. The dual yield point buckling restrained brace of claim 1, wherein: the plate width of the second connecting section (23) is larger than that of the second core section (21), and the second transition section (22) smoothly transitions between the second core section (21) and the second connecting section (23).
6. The dual yield point buckling-restrained brace of any one of claims 1-5, wherein: the cross section of the outer sleeved steel pipe (31) is rectangular.
7. The dual yield point buckling restrained brace of claim 6, wherein: the filling material (32) is concrete, the unbonded sliding mechanism unit is an unbonded coating arranged on the outer surface of the core unit, a layer of slidable material (8) is further arranged between the first yielding steel plate (1) and the second yielding steel plate (2), and the slidable material (8) is polytetrafluoroethylene.
8. The dual yield point buckling restrained brace of claim 6, wherein: the edge of the outer sleeved steel pipe (31) is aligned with the outer edge of the first transition section (12).
9. The dual yield point buckling-restrained brace of any one of claims 2-5, wherein: the connecting unit (4) comprises a connecting assembly, the connecting assembly comprises a connecting assembly plate and connecting bolts (5), the connecting assembly plate comprises two parallel clamping plates (41) which are clamped at the outer sides of a first connecting section (13) and a second connecting section (23), a group of bolt holes (6) for the connecting bolts (5) to pass through are formed in the clamping plates (41), corresponding first connecting holes (14) and second connecting holes (24) are formed in positions, corresponding to the first connecting section (13) and the second connecting section (23), of the bolt holes (6), the first connecting holes (14), the second connecting holes (24) and the bolt holes (6) are aligned one by one and are bolted through the connecting bolts (5), the connecting assembly plate further comprises limiting plates (42) which are vertically and fixedly connected at the outer sides of the clamping plates, the outer side end faces of the first connecting section (13) and the outer side end faces of the second connecting plate (23) are tightly attached to the inner side surfaces of the limiting plates (42), the connecting group plate also comprises an ear plate (43) fixedly connected to the outer side of the limiting plate (42) in the middle, and the ear plate (43) is parallel to the staged yielding combination plate and is provided with an ear plate hole (44).
10. The dual yield point buckling restrained brace of claim 9, wherein: the bolt holes are round holes, the first connecting hole (14) and the second connecting hole (24) are round holes, or the first connecting hole (14) is a round hole, the second connecting hole (24) is a long round hole, or the first connecting hole (14) is a long round hole, the second connecting hole (24) is a round hole, or the first connecting hole (14) and the second connecting hole (24) are long round holes.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110856782.9A CN113417502B (en) | 2021-07-28 | 2021-07-28 | Double-yield-point buckling restrained brace |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202110856782.9A CN113417502B (en) | 2021-07-28 | 2021-07-28 | Double-yield-point buckling restrained brace |
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| Publication Number | Publication Date |
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| CN113417502A true CN113417502A (en) | 2021-09-21 |
| CN113417502B CN113417502B (en) | 2023-02-28 |
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| CN202110856782.9A Active CN113417502B (en) | 2021-07-28 | 2021-07-28 | Double-yield-point buckling restrained brace |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113958000A (en) * | 2021-12-22 | 2022-01-21 | 北京市建筑设计研究院有限公司 | Series sleeve type double-yield-point buckling restrained brace |
| CN113958001A (en) * | 2021-12-22 | 2022-01-21 | 北京市建筑设计研究院有限公司 | Parallel multiple sleeve type double-yield-point buckling restrained brace |
| CN115234034A (en) * | 2022-08-02 | 2022-10-25 | 东华理工大学 | Stainless steel multistage energy consumption buckling restrained brace |
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| CN112922428A (en) * | 2021-03-18 | 2021-06-08 | 震安科技股份有限公司 | Large-displacement high-performance buckling constraint core unit structure and support |
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| CN101105054A (en) * | 2007-07-10 | 2008-01-16 | 中国建筑科学研究院 | Double-layer sleeve cross buckling restrained brace with diaphragm plate |
| JP2012001939A (en) * | 2010-06-15 | 2012-01-05 | Mitsubishi Heavy Ind Ltd | Hysteretic damper structure |
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113958000A (en) * | 2021-12-22 | 2022-01-21 | 北京市建筑设计研究院有限公司 | Series sleeve type double-yield-point buckling restrained brace |
| CN113958001A (en) * | 2021-12-22 | 2022-01-21 | 北京市建筑设计研究院有限公司 | Parallel multiple sleeve type double-yield-point buckling restrained brace |
| CN113958001B (en) * | 2021-12-22 | 2022-03-04 | 北京市建筑设计研究院有限公司 | Parallel multiple sleeve type double-yield-point buckling restrained brace |
| CN115234034A (en) * | 2022-08-02 | 2022-10-25 | 东华理工大学 | Stainless steel multistage energy consumption buckling restrained brace |
| CN115234034B (en) * | 2022-08-02 | 2023-05-19 | 东华理工大学 | Stainless steel multistage energy dissipation buckling restrained brace |
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| Publication number | Publication date |
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| CN113417502B (en) | 2023-02-28 |
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