CN216616349U

CN216616349U - Parallel triple-sleeve type double-yield-point buckling restrained brace

Info

Publication number: CN216616349U
Application number: CN202123239179.0U
Authority: CN
Inventors: 閤东东; 苗启松; 解琳琳; 刘谦敏; 程俊飞; 陈晗; 陈曦; 赵帆; 卢筱; 刘长东; 许关飞; 刘性硕; 武京
Original assignee: Beijing Institute of Architectural Design Group Co Ltd
Current assignee: Beijing Institute of Architectural Design Group Co Ltd
Priority date: 2021-12-22
Filing date: 2021-12-22
Publication date: 2022-05-27
Anticipated expiration: 2031-12-22

Abstract

The invention discloses a parallel triple sleeve type double-yield-point buckling restrained brace, which comprises: a concrete core area; the concrete core area is formed by pouring concrete inside the first-stage energy-consumption soft steel pipe, and at least one end of the first-stage energy-consumption soft steel pipe is provided with a limiting pin; the second-stage energy-consumption soft steel pipe is sleeved outside the first-stage energy-consumption soft steel pipe, and the pipe wall of at least one end of the second-stage energy-consumption soft steel pipe is provided with a first limiting hole; the constraint steel pipe is sleeved outside the secondary energy consumption soft steel pipe, and the pipe wall of at least one end of the constraint steel pipe is provided with a second limiting hole; the limiting pin is embedded into the first limiting hole and the second limiting hole, the cross section of the limiting pin is smaller than that of the first limiting hole, and the size of the first limiting hole is smaller than that of the second limiting hole. The buckling restrained brace can play the energy consumption performance of the full anti-seismic stage of the structure, ensures the safety of the structure, has high bearing energy consumption strength, and meets the requirement of large-tonnage bearing energy consumption.

Description

Parallel triple-sleeve type double-yield-point buckling restrained brace

Technical Field

The invention relates to the technical field of building components, in particular to a parallel triple-sleeve type double-yield-point buckling restrained brace.

Background

The buckling restrained brace provides lateral stiffness for the structure under the action of small shock, and plays a role of a common brace; under the action of medium and large earthquakes, the buckling restrained brace can dissipate the energy input by the earthquake through repeated pulling and pressing hysteresis.

In recent years, the application range of the buckling restrained brace is expanded by researching and applying the combination of dampers with different energy consumption mechanisms and the combination of dampers with different energy consumption materials. In addition, part of scholars adopt the combination of the core sections with the oblong holes with different lengths and the bolts to convert the support axial force into the shearing force of the bolts, so that the staged yielding of the buckling restrained brace parallel core sections is realized, but the limited shearing resistance bearing capacity of the bolts leads the buckling restrained brace with staged yielding to be only suitable for the condition of small tonnage, and the popularization and the application of the staged yielding buckling restrained brace are severely limited.

The inventor has carried out relevant research on the double-yield-point energy dissipation structure, but in practical application, the bearing capacity is small, the double-yield-point energy dissipation structure cannot be used for large-tonnage bearing, and the double-yield-point energy dissipation structure is not suitable for large-volume building structures such as high-rise buildings and super high-rise buildings, so that the existing structure needs to be further improved.

Disclosure of Invention

In order to solve the above problems, an object of the present invention is to provide a buckling restrained brace, and in particular, to a parallel triple-sleeve type double-yield-point buckling restrained brace, so as to solve one or more problems of the existing buckling restrained brace, and especially to meet the requirement of large tonnage bearing.

The above purpose can be realized by the following technical scheme:

the invention provides a parallel triple-sleeve type double-yield-point buckling restrained brace, which comprises:

the concrete core area is used as a buckling restrained brace buckling-restrained core unit;

the concrete core area is formed by pouring concrete inside the first-stage energy-consumption soft steel pipe, and at least one end of the first-stage energy-consumption soft steel pipe is provided with a limiting pin;

the second-stage energy-consumption soft steel pipe is sleeved outside the first-stage energy-consumption soft steel pipe, and the pipe wall of at least one end of the second-stage energy-consumption soft steel pipe is provided with a first limiting hole;

the constraint steel pipe is sleeved outside the secondary energy consumption soft steel pipe, and the pipe wall of at least one end of the constraint steel pipe is provided with a second limiting hole;

the first limiting hole corresponds to the second limiting hole in position, the limiting pin is embedded into the first limiting hole and the second limiting hole, the cross section size of the limiting pin is smaller than that of the first limiting hole, and the size of the first limiting hole is smaller than that of the second limiting hole.

In some embodiments, at least one end of the primary energy-consuming mild steel pipe is welded with a section of connecting steel bar, the connecting steel bar and the primary energy-consuming mild steel pipe are sleeved together in the secondary energy-consuming mild steel pipe, and the limiting pin is installed on the connecting steel bar.

In some embodiments, a through hole is formed in the connecting steel bar, the limiting pin is a whole, penetrates through the through hole, and is embedded into two first limiting holes on the secondary energy consumption soft steel pipe and two second limiting holes on the constraint steel pipe; or,

two non-through holes are symmetrically formed in the connecting steel bar, two limiting pins are arranged, the two limiting pins are respectively inserted into the two non-through holes, and are embedded into the two first limiting holes in the secondary energy consumption soft steel pipe and the two second limiting holes in the constraint steel pipe.

In some embodiments, the length of the first-stage energy-consumption soft steel pipe is shorter than that of the second-stage energy-consumption soft steel pipe and that of the constraint steel pipe, and the lengths of the second-stage energy-consumption soft steel pipe and that of the constraint steel pipe are the same.

In some embodiments, an unbonded sliding layer is arranged between the concrete core area and the first-stage energy-consuming soft steel pipe, between the first-stage energy-consuming soft steel pipe and the second-stage energy-consuming soft steel pipe, and/or between the second-stage energy-consuming soft steel pipe and the constraint steel pipe.

In some embodiments, the first limiting hole, the second limiting hole, the limiting pin and the connecting steel bar are only arranged at one end, the connecting steel bar is connected with one end connecting piece in a welding mode, and the first-stage energy-consumption soft steel pipe, the second-stage energy-consumption soft steel pipe and the constraint steel pipe are connected with the other end connecting piece in a welding mode.

In some embodiments, the other end of the first-stage energy-consumption soft steel pipe, the second-stage energy-consumption soft steel pipe and the end of the constraint steel pipe are welded with a sealing plate, and the other end connecting piece is welded with the sealing plate.

In some embodiments, the first limiting hole, the second limiting hole, the limiting pin and the connecting steel bar are arranged at two ends, and the connecting steel bars at the two ends are respectively connected with an end connecting piece in a welding mode.

In some embodiments, the cross sections of the primary energy consumption soft steel pipe, the secondary energy consumption soft steel pipe and the constraint steel pipe are rectangular, square or circular.

Compared with the prior art, the invention has the following beneficial effects:

(1) introducing a first-stage energy-consumption soft steel pipe and a second-stage energy-consumption soft steel pipe, and restraining the maximum deformation value delta of energy consumption by controlling first-stage buckling₁And the maximum deformation value delta of the two-stage buckling constraint energy consumption₂The two-stage working mode of double-yield-point design is realized, and the next-stage energy-dissipating mild steel generates yield energy dissipation under the action of small shock, so that the energy dissipation and shock absorption effects are achieved; meanwhile, the device is ensured to still have the energy consumption capability under the working conditions of medium and large earthquakes;

(2) introducing a constraint steel pipe, and when the supporting energy consumption soft steel pipe reaches a deformation value delta₂Then, the device continues to provide necessary lateral stiffness for the structure through the constraint steel pipe, so that the structure is prevented from being seriously damaged and completely quitting working under the action of the estimated rare earthquake, and meanwhile, the primary energy consumption soft steel pipe and the secondary energy consumption soft steel pipe are prevented from buckling in the whole energy consumption process;

(3) the concrete core area is introduced to provide radial restraint for the first-stage energy consumption soft steel pipe, so that the first-stage energy consumption soft steel pipe is not bent in the whole energy consumption process; meanwhile, the concrete core area adopts high-strength concrete or grouting material, necessary constraint conditions can be provided for large-tonnage bearing of the primary energy-consumption soft steel pipe, and the size and the cross section of the energy-consumption soft steel pipe also meet the performance requirements of large-tonnage energy-consumption components;

(4) the supporting main body structure and the end connecting node are simple in structure, reasonable in layout, reliable in connection and easy to implement.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below. It should be apparent that the drawings in the following description are merely exemplary, and that other embodiments can be derived from the drawings provided by those of ordinary skill in the art without inventive effort.

The structures, ratios, sizes, and the like shown in the present specification are only used for matching with the contents disclosed in the specification, so that those skilled in the art can understand and read the present invention, and do not limit the conditions for implementing the present invention, so that the present invention has no technical significance, and any structural modifications, changes in the ratio relationship, or adjustments of the sizes, without affecting the functions and purposes of the present invention, shall fall within the scope covered by the technical contents disclosed in the present invention.

FIG. 1 is a schematic illustration of an explosive structure according to an exemplary embodiment of the present invention;

FIG. 2 is a schematic cross-sectional view schematically illustrating FIG. 1;

FIG. 3 is a longitudinal cross-sectional view of the end node of FIG. 1, as exemplary;

FIG. 4 is a top plan view of the end node exemplarily shown in FIG. 1;

fig. 5-8 are general top view schematic diagrams of various exemplary embodiments of the present invention.

Detailed Description

In order to make the objects, technical solutions and advantages of the embodiments of the present invention more apparent, the present invention is described in further detail below with reference to the embodiments and the accompanying drawings. The exemplary embodiments and descriptions of the present invention are provided to explain the present invention, but not to limit the present invention.

In the description of the present invention, the terms "comprises/comprising," "consisting of … …," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a product, apparatus, process, or method that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such product, apparatus, process, or method if desired. Without further limitation, an element defined by the phrases "comprising/… …", "consisting of … …" does not exclude the presence of additional like elements in a product, device, process or method that comprises the element.

It is to be understood that, unless otherwise expressly specified or limited, the terms "mounted," "connected," "secured," and the like are intended to be open-ended, i.e., to mean either a fixed connection, a removable connection, or an integral part; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood according to specific situations by those of ordinary skill in the art.

It will be further understood that the terms "upper," "lower," "front," "rear," "left," "right," "top," "bottom," "inner," "outer," "center," and the like are used in an orientation or positional relationship illustrated in the drawings for convenience in describing and simplifying the invention, and do not indicate or imply that the device, component, or structure being referred to must have a particular orientation, be constructed in a particular orientation, or be operated in a particular manner, and should not be construed as limiting the invention.

Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include one or more of that feature. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise.

The following describes the implementation of the present invention in detail with reference to preferred embodiments.

The buckling restrained brace consists of a core material, a non-adhesive material, a filling material and an outer sleeve. The buckling restrained brace only has the core plate connected with other components, all the load borne by the core plate is borne by the core plate, and the restrained sleeve only restrains the core plate from buckling under compression, so that the core plate can be subjected to yielding under tension and compression, and therefore, the buckling restrained brace has excellent hysteresis performance and better energy consumption capability.

The general buckling restrained brace mainly comprises three parts, namely a core unit, an outer wrapping restrained unit and a sliding mechanism unit. When the core energy consumption section bears axial pressure, the outsourcing constraint unit is utilized to constrain the transverse deformation of the core energy consumption section, so that the core energy consumption section is prevented from buckling, the core energy consumption section can generate 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.

The existing BRB buckling restrained brace mainly has the following problems:

(1) the traditional buckling restrained brace generally has only one yield point, and the brace generally does not yield under the action of small shock and only provides lateral rigidity;

(2) the existing buckling restrained brace cannot meet the requirement of providing necessary lateral rigidity for the structure when the structure encounters more than estimated earthquake;

(3) the existing buckling restrained brace can not meet the requirements of multi-stage energy consumption and large-tonnage bearing energy consumption at the same time.

Therefore, the buckling restrained brace provided by the invention can play the energy consumption performance of the full anti-seismic stage of the structure, and can still provide necessary lateral stiffness for the structure when the structure encounters an earthquake exceeding the estimated prevention, so that the safety of the structure is ensured, and the application range is wider.

As shown in fig. 1, fig. 1 is an exploded schematic view of the whole device, showing a parallel triple-sleeve double-yield-point buckling restrained brace according to an implementation manner of the invention, and the whole device can be provided with the following components: the concrete core area 1, the primary energy consumption soft steel pipe 2, the secondary energy consumption soft steel pipe 3, the constraint steel pipe 4, the unbonded sliding material 5, the limit pin 6, the connecting steel bar 7, the closing plate 8 and the end connecting piece 9 are only combined and formed in a preferable mode for realizing the invention, and do not mean that the whole device is required to use all the components, and the necessary structure, functions and realization modes of the whole device are exemplarily described in detail below.

It is easy to understand that "parallel connection" mainly means that the first-stage energy consumption soft steel pipe 2, the second-stage energy consumption soft steel pipe 3 and the constraint steel pipe 4 are in parallel connection. "buckling", sometimes also referred to as yielding, reaches a critical state of stress or deformation at the limit. "support" is a generic term for a type of structure or member, and is not limited to a specific form or function of the structure, and may be a tension member, a compression member, etc., or a combination thereof according to a use scenario.

The core assembly is explained in detail below with reference to the drawings.

As shown in fig. 2, in the invention, the concrete core area 1 serves as a buckling restrained core unit of the whole buckling restrained brace, bears the compression effect, provides radial restraint for the later first-stage energy-consuming soft steel pipe 2, and prevents the inward local buckling instability of the first-stage energy-consuming soft steel pipe 2.

According to the invention, the primary energy-consumption soft steel pipe 2 is wrapped outside the concrete core area 1, namely the concrete is poured inside the primary energy-consumption soft steel pipe 2 to form the concrete core area 1, and the primary energy-consumption soft steel pipe 2 can provide a certain degree of constraint effect for the concrete in the core area, so that the support strength of the concrete is improved.

At least one end of the first-level energy-consumption soft steel pipe 2 is provided with a limiting pin 6, and the function of the limiting pin 6 will be explained in detail later.

The secondary energy consumption soft steel pipe 3 is sleeved outside the primary energy consumption soft steel pipe 2, and at least one end of the secondary energy consumption soft steel pipe 3 is provided with a first limiting hole 3-1 on the pipe wall; when the first-stage energy consumption soft steel pipe 2 is subjected to buckling energy consumption, the second-stage energy consumption soft steel pipe 3 provides lateral restraint for the first-stage energy consumption soft steel pipe 2, and the first-stage energy consumption soft steel pipe 2 is prevented from being subjected to out-of-plane instability.

In the present invention, the use of "soft steel pipe" is not the only option, and ordinary steel materials such as Q235 can be used, and in practical applications, soft steel pipe is preferred in at least the first yield section because of its superior hysteresis energy dissipation curve.

In addition, the "mild steel" may be carbon steel having a carbon content of less than 0.25%, and has low strength and low hardness.

It should be understood that the primary and secondary energy dissipating

soft steel pipes

2 and 3 each play the same important role in the whole restraining support according to the earthquake intensity and the yield stage, and the primary and secondary energy dissipating soft steel pipes are only in a hierarchical relationship here and are not limited to the level, primary and secondary or importance.

The constraint steel pipe 4 is sleeved outside the secondary energy consumption soft steel pipe 3, and at least one end of the constraint steel pipe 4 is provided with a second limiting hole 4-1 on the pipe wall; when the second-stage energy consumption soft steel pipe 3 is subjected to buckling energy consumption, the constraint steel pipe 4 provides radial constraint for the second-stage energy consumption soft steel pipe 3, so that the second-stage energy consumption soft steel pipe 3 is prevented from being unstable, and meanwhile, the constraint steel pipe 4 can provide necessary lateral stiffness for the structure.

In the invention, the restraint steel pipe 4 can be a common steel pipe, the wall thickness has no special requirement, and the requirement of no yield under the condition of large shock in practical application can be met.

The first limiting hole 3-1 and the second limiting hole 4-1 are corresponding in position, and the limiting pin 6 is embedded into the first limiting hole 3-1 and the second limiting hole 4-1 simultaneously. The size of the cross section of the limiting pin 6 is smaller than that of the first limiting hole 3-1, the size of the first limiting hole 3-1 is smaller than that of the second limiting hole 4-1, namely, a first gap is formed between the limiting pin 6 and the edge of the first limiting hole 3-1 in the axial direction, and the first gap is defined as delta₁A second gap is formed between the limit pin 6 and the edge of the second limit hole 4-1 in the axial direction, and the second gap is defined as delta₂The first gap is delta₁A second clearance delta from₂The function of which will be described in detail later.

In some embodiments, referring to fig. 1 and 3 again, a connecting steel bar 7 is welded to at least one end of the primary energy consumption soft steel pipe 2, the connecting steel bar 7 and the primary energy consumption soft steel pipe 2 are sleeved together in the secondary energy consumption soft steel pipe 3, and the limit pin 6 is installed on the connecting steel bar 7. The invention preferably adopts a solid steel bar structure and is welded with the first-stage energy-consumption soft steel pipe 2, in particular to the end surface of the first-stage energy-consumption soft steel pipe 2, the limiting pin 6 is arranged on the end surface, compared with the situation that the limiting pin 6 is directly arranged on the first-stage energy-consumption soft steel pipe 2, the first-stage energy-consumption soft steel pipe 2 is soft steel, the pipe wall strength is lower, the local damage to the first-stage energy-consumption soft steel pipe 2 caused by the arrangement of the limiting pin 6 is avoided, the connection strength of the limiting pin 6 is difficult to ensure, and the problem is well solved by the connecting steel bar 7.

Preferably, the length of the connecting steel bar 7 is not limited temporarily, only the limiting pin 6 is installed enough, and the size of the cross section of the connecting steel bar 7 is not limited, but the connecting steel bar is preferably designed to be the same as the size of the cross section of the first-stage energy-consumption soft steel pipe 2, so that welding construction is facilitated, and the connecting steel bar 7 can just block the end face of the first-stage energy-consumption soft steel pipe 2 after welding connection, so that concrete is sealed in the first-stage energy-consumption soft steel pipe 2, and the corrosion resistance of the concrete in a core area is improved.

In the invention, the connecting steel bar 7 is provided with an insertion hole, and the limiting pin 6 is inserted into the insertion hole and connected with the connecting steel bar 7. The specific form of the insertion hole is not limited, and the insertion hole can be arranged according to the section form of the connecting steel bar 7 as long as the insertion hole can be matched with the limiting pin 6, so that the limiting pin 6 can be conveniently inserted and kept in the insertion hole.

In some embodiments, the insertion hole on the connecting steel bar 7 is a through hole, the limiting pin 6 is a whole body, penetrates through the through hole, is embedded into the two first limiting holes 3-1 on the secondary energy consumption soft steel pipe 3, and is embedded into the two second limiting holes 4-1 on the restraining steel pipe 4, so that the connecting steel bar 7 and the primary energy consumption soft steel pipe 2 are restrained in the first limiting holes 3-1 and the second limiting holes 4-1.

Certainly, two non-through holes can be symmetrically formed in the connecting steel bar 7, two limiting pins 6 are provided, the two limiting pins 6 are respectively inserted into the two non-through holes and embedded into the two first limiting holes 3-1 of the secondary energy consumption flexible steel pipe 3 and the two second limiting holes 4-1 of the constraint steel pipe 4, and the connecting steel bar 7 and the primary energy consumption flexible steel pipe 2 are constrained in the first limiting holes 3-1 and the second limiting holes 4-1.

In addition, the size of the through hole or the non-through hole is slightly smaller than that of the stopper pin 6, or a structure such as a protrusion, a convex strip, a convex rib or the like is provided on the inner wall of the hole, or the stopper pin 6 and the insertion hole are designed to be in threaded connection, so that the stopper pin 6 can be firmly held after being wedged, and is prevented from slipping out of the hole.

It is easily understood that the above-mentioned connection of the arresting pin 6 and the connecting steel bar 7 is possible and that the strength and reliability of the connection are guaranteed, but this is not the only limitation of the present invention, and other connection means reasonably foreseen by a person skilled in the art should not be understood as departing from the spirit of the present invention.

Referring again to fig. 1, the present invention provides for the attachment of end connectors 9 at both ends of the brace, the end connectors 9 being adapted to be connected to a host structure or structural member to which the entire buckling restrained brace is attached. The end connecting piece 9 of the invention adopts a cross connecting component formed by welding steel plates, the steel plates are provided with bolt holes and are fixedly connected with a main body structure or a structural component through bolts.

Referring to fig. 1 and 2, as a preferred embodiment, an unbonded sliding layer 5 is further disposed between the concrete core region 1 and the primary energy dissipating soft steel pipe 2, the unbonded sliding layer 5 is formed by an unbonded sliding material in a gap between the concrete core region 1 and the primary energy dissipating soft steel pipe 2, and particularly, the energy dissipating member may be coated with a common material such as polytetrafluoroethylene when being processed in a factory. The unbonded sliding material provides a sliding interface between two structural interfaces, so that friction is reduced, the buckling restrained brace has similar mechanical properties as much as possible when being pulled and pressed, and the increase of axial force caused by friction between the energy consumption unit and the restrained unit after being pressed and expanded is avoided.

Of course, an unbonded sliding layer can be arranged between the first-stage energy consumption soft steel pipe 2 and the second-stage energy consumption soft steel pipe 3 and between the second-stage energy consumption soft steel pipe 3 and the constraint steel pipe 4 independently or simultaneously.

In some embodiments, with continued reference to fig. 1, the length of the first-stage energy-consuming soft steel pipe 2 is shorter than the length of the second-stage energy-consuming soft steel pipe 3 and the length of the constraining steel pipe 4, or the lengths of the second-stage energy-consuming soft steel pipe 3 and the length of the constraining steel pipe 4 are designed to be the same, so that convenience is provided for connecting the limiting pin 6 at one end or two ends of the first-stage energy-consuming soft steel pipe 2, limiting holes can be conveniently formed in the second-stage energy-consuming soft steel pipe 3 and the constraining steel pipe 4, and the limiting pin 6 is connected at one end or two ends of the first-stage energy-consuming soft steel pipe 2 and embedded into the limiting holes.

Even, as shown in fig. 3, the length difference between the first-stage energy-consumption soft steel pipe 2 and the second-stage energy-consumption soft steel pipe 3 and the restraint steel pipe 4 is exactly equal to the length of the connecting steel bar 7, so that after the connecting steel bar 7 is fixedly welded to the end face of the first-stage energy-consumption soft steel pipe 2, the connecting steel bar 7 is flush with the end faces of the second-stage energy-consumption soft steel pipe 3 and the restraint steel pipe 4, and the structural arrangement is more reasonable.

In some embodiments, as shown in fig. 3, two first limiting holes 3-1 are symmetrically formed in the tube wall of the secondary energy consumption soft steel tube 3, and two corresponding second limiting holes 4-1 are symmetrically formed in the tube wall of the constraint steel tube 4, or four limiting holes are formed in the tube section in a manner of uniformly distributing the upper part, the lower part, the left part and the right part, as the case may be, and the symmetrically arranged limiting pins 6 can ensure that the sliding energy consumption on the tube wall section is more reasonable and the stress is more uniform.

In the invention, the cross section forms of the first-stage energy consumption soft steel pipe 2, the second-stage energy consumption soft steel pipe 3 and the constraint steel pipe 4 are not limited, the common steel pipe sections of the constraint support in the building can be used, and the invention preferably adopts rectangular, square or circular section steel pipes, as shown in figures 5-8.

Accordingly, the form of the first and second position-limiting holes 3-1 and 4-1 can be flexibly adjusted, and the present invention is exemplified by rectangular holes, i.e., rectangular long sides along the axial direction of the tube and short sides along the radial direction of the tube, but it is obvious that other forms of holes, such as square holes, circular holes, elliptical holes, cross-shaped holes, etc., do not depart from the spirit of the present invention.

In the invention, the buckling energy dissipation structure can be arranged at one end of the support, namely the first limiting hole 3-1, the second limiting hole 4-1 and the limiting pin 6 are arranged at one end, as shown in fig. 5 and 6, the end part connecting piece 9 is welded with the connecting steel bar 7 at the end, a sealing plate 8 is welded with the first-stage energy dissipation soft steel pipe 2, the second-stage energy dissipation soft steel pipe 3 and the constraint steel pipe 4 at the other end of the support, the end surface of each steel pipe is sealed, and the other end part connecting piece 9 is welded on the sealing plate 8.

Certainly, the buckling energy dissipation structure may also be disposed at both ends of the brace, which depends on the use situation of the brace, that is, the first limiting hole 3-1, the second limiting hole 4-1 and the limiting pin 6 are disposed at both ends, as shown in fig. 7 and 8, and the manner of disposing both ends is the same, which is not described in detail.

The assembly process of the parallel triple-sleeve double-yield-point buckling restrained brace (taking fig. 1 as an example) comprises the following steps:

firstly, welding a first-stage energy-consumption soft steel pipe 2 (an unbonded sliding material is coated inside to form an unbonded sliding layer 5) with a right sealing plate 8;

secondly, pouring a concrete core area 1;

thirdly, welding the connecting steel bar 7 with the left side of the first-stage energy-consumption soft steel pipe 2;

fourthly, brushing an unbonded sliding material outside the first-stage energy-consumption soft steel pipe 2 to form an unbonded sliding layer 5, and sleeving the second-stage energy-consumption soft steel pipe 3 outside the first-stage energy-consumption soft steel pipe 2 and welding the second-stage energy-consumption soft steel pipe with a right sealing plate 8;

fifthly, brushing an unbonded sliding material on the outer side of the secondary energy consumption soft steel pipe 3 to form an unbonded sliding layer 5, and sleeving the constraint steel pipe 4 outside the secondary energy consumption soft steel pipe 3 and welding the constraint steel pipe with a right sealing plate 8;

sixthly, inserting a limit pin 6;

and in the seventh part, the left end connector 9 is welded with the connecting steel bar 7, and the right end connector 9 is welded with the closing plate 8.

The parallel triple-sleeve type double-yield-point buckling restrained brace has two working stages, and the working mechanism is as follows:

(1) a first yielding phase: the buckling restrained energy dissipation allowable deformation value designed at the stage is smaller than delta₁Delta can be reached in the limit state₁This is a critical state. The secondary energy consumption soft steel pipe 3 provides lateral restraint for the primary energy consumption soft steel pipe 2 at the stage, the primary energy consumption soft steel pipe 2 is prevented from being out-of-plane unstable, and at the moment, the primary energy consumption soft steel pipe 2 generates buckling energy consumption to play an energy dissipation and shock absorption role. In this stage, the concrete core area 1 provides radial restraint for the first-stage energy-consumption soft steel pipe 2, and the soft steel pipe is prevented from being unstable radially inwards.

(2) A second yield stage for designing the allowable deformation value of the buckling constraint energy consumption to be less than delta₂But greater than δ₁. The restraining steel pipe 4 in the stage provides radial restraint for the second-stage energy consumption soft steel pipe 3, the second-stage energy consumption soft steel pipe 3 is prevented from being unstable, at the moment, the first-stage energy consumption soft steel pipe 2 is subjected to buckling energy consumption in the previous stage, and meanwhile, the first-stage energy consumption soft steel pipe and the second-stage energy consumption soft steel pipe 3 are buckled together to consume energy in the stage. The stage is mainly applied to providing energy dissipation and shock absorption guarantee for the structure when the structure encounters rare fortification earthquake action.

After the supporting device finishes the two-stage energy dissipation and shock absorption effects, the first-stage energy dissipation soft steel pipe 2 and the second-stage energy dissipation soft steel pipe 3 quit working, and the device provides necessary lateral stiffness for the structure through the constraint steel pipe 4. Therefore, the unfavorable condition that the lateral stiffness of the building is suddenly reduced instantly due to the fact that the energy consumption component is withdrawn from working under the action of the structure exceeding the estimated rare earthquake is avoided.

The invention can solve the problems in the prior art and realize that:

(1) aiming at the difficult problems that the traditional buckling restrained brace generally has only one yield point, does not yield under the action of small earthquake, only provides additional rigidity and does not participate in energy consumption, a first-stage energy consumption soft steel pipe 2 and a second-stage energy consumption soft steel pipe 3 are introduced, and the maximum deformation value delta of the first-stage buckling restrained energy consumption is controlled₁And the maximum deformation value delta of the two-stage buckling constraint energy consumption₂The two-stage working mode of double-yield-point design is realized, and the problem can be successfully solved;

(2) aiming at the problems that the existing buckling restrained brace mainly depends on core units to perform structural seismic resistance and energy dissipation, when the structure meets the estimated earthquake, the core units consume energy and are damaged, the brace completely quits the work, so that the lateral stiffness resistance of the building is instantly suddenly reduced, and the collapse and the damage of the building are easily caused, the restraint steel pipe 4 is introduced, and when the support energy dissipation soft steel pipe reaches the deformation value delta₂Then, the device continues to provide necessary lateral stiffness for the structure through the constraint steel pipe 4, and the structure is prevented from being seriously damaged under the action of an estimated rare earthquake;

(3) the combined action of the concrete core area 1 and the restraint steel pipe 4 is utilized to achieve that the primary energy consumption soft steel pipe 2 and the secondary energy consumption soft steel pipe 3 do not generate out-of-plane integral buckling instability in the whole energy consumption process;

(4) the first-level energy-consumption soft steel pipe 2 is filled with the concrete core area 1 and acts with the restraint steel pipe 4 in a combined manner, so that the bearing energy consumption strength of the whole restraint support is greatly improved, the device is particularly suitable for large-tonnage bearing requirements, and the defect of low bearing strength of the structure of the conventional device is overcome.

It will be readily appreciated by those skilled in the art that the various preferences described above may be freely combined, superimposed without conflict.

The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.

Claims

1. A parallelly connected triple double-yield-point buckling restrained brace is characterized by comprising:

2. The buckling-restrained brace of claim 1, wherein:

at least one end of the first-level energy-consumption soft steel pipe is welded with a section of connecting steel bar, the connecting steel bar and the first-level energy-consumption soft steel pipe are sleeved in the second-level energy-consumption soft steel pipe, and the limiting pin is arranged on the connecting steel bar.

3. The buckling-restrained brace of claim 2, wherein:

the connecting steel bar is provided with a through hole, the limiting pin is a whole, penetrates through the through hole, and is embedded into two first limiting holes on the secondary energy consumption soft steel pipe and two second limiting holes on the constraint steel pipe; or,

4. The buckling-restrained brace of claim 1, wherein:

the length of the first-stage energy consumption soft steel pipe is shorter than that of the second-stage energy consumption soft steel pipe and that of the constraint steel pipe, and the lengths of the second-stage energy consumption soft steel pipe and that of the constraint steel pipe are the same.

5. The buckling-restrained brace of claim 1, wherein:

and an unbonded sliding layer is arranged between the concrete core area and the first-stage energy consumption soft steel pipe, between the first-stage energy consumption soft steel pipe and the second-stage energy consumption soft steel pipe, and/or between the second-stage energy consumption soft steel pipe and the constraint steel pipe.

6. The buckling-restrained brace of claim 2, wherein:

the first limiting hole, the second limiting hole, the limiting pin and the connecting steel bar are only arranged at one end, the connecting steel bar is in welded connection with one end part connecting piece, and the first-stage energy-consumption soft steel pipe, the second-stage energy-consumption soft steel pipe and the restraint steel pipe are in welded connection with the other end part connecting piece at the other end.

7. The buckling-restrained brace of claim 6, wherein:

and the other end of the first-stage energy-consumption soft steel pipe, the second-stage energy-consumption soft steel pipe and the end part of the restraint steel pipe are welded with a sealing plate, and the other end connecting piece is welded with the sealing plate.

8. The buckling-restrained brace of claim 2, wherein:

the first limiting hole, the second limiting hole, the limiting pin and the connecting steel bar are arranged at two ends, and the connecting steel bars at the two ends are respectively connected with one end part connecting piece in a welding mode.

9. A buckling-restrained brace as claimed in any one of claims 1 to 8, wherein:

the cross sections of the first-stage energy consumption soft steel pipe, the second-stage energy consumption soft steel pipe and the restraint steel pipe are rectangular, square or circular.