Embedded prestressed carbon fiber self-resetting buckling-restrained brace

Abstract

The invention provides an embedded prestressed carbon fiber self-resetting buckling-restrained brace, which comprises a core material used for yielding energy consumption in an axial tension or compression state; the restraining body is arranged on the outer side of the core material in a sleeving mode and used for restraining buckling of the core material when the core material is pressed; the inner sleeve is arranged on the outer side of the restraining body in a sleeving mode, two inner sleeve lug plates are arranged on the inner side of one end of the inner sleeve in an up-and-down corresponding mode, and inner sleeve inserting grooves are formed in the other end of the inner sleeve in an up-and-down corresponding mode; the outer side of the inner sleeve is sleeved with the outer sleeve, and an outer sleeve lug plate corresponding to the inner sleeve inserting groove is arranged on the inner side of one end of the outer sleeve; the prestress assembly is provided with sealing plates abutting against the two ends of the outer sleeve, and a prestress part is connected between the two sealing plates; the post-earthquake energy-dissipating and resetting device has the energy-dissipating capacity, meanwhile, the post-earthquake resetting function can be achieved, and the economic and time cost of post-earthquake repairing is remarkably reduced.

Description

Technical Field

[0001] The invention belongs to the technical field of engineering disaster prevention, and specifically relates to an embedded prestressed carbon fiber self-resetting anti-buckling support. Background Art

[0002] Buckling-resistance braces are highly efficient energy dissipation and shock-absorbing components that are designed to eliminate or significantly reduce the risk of buckling failure of ordinary braces under compression, thereby providing a stable energy dissipation mechanism under earthquakes or other dynamic loads. Buckling-resistance braces are mainly composed of core materials and restraints. The core material mainly bears axial tension and pressure, and is usually made of steel with a lower yield point; the restraints mainly play a buckling restraining role on the core material, so that the core material can stably dissipate energy under axial tension and compression loads, achieving energy dissipation and shock-absorbing effects.

[0003] In the prior art, a Chinese invention patent application with application publication number CN115853148A discloses an anti-buckling support, which includes an outer cylinder, a first connecting rod, an elastic member and a second connecting rod. The outer cylinder has a first end and a second end along its axial direction, and the first end is connected to the first member; the first connecting rod is arranged in the outer cylinder near the first end; the elastic member is arranged in the outer cylinder, and one end of the elastic member is connected to the end of the first connecting rod away from the first end; the second connecting rod is partially arranged in the outer cylinder and near the second end, one end of the second connecting rod is connected to the elastic member, and the other end is suitable for extending out of the outer cylinder to connect to the second member. It has stable and reliable energy consumption capacity and improves energy consumption efficiency.

[0004] Although the above-mentioned buckling-resistance braces have a high energy absorption capacity, they will cause a large amount of residual deformation after a large or extremely large earthquake. Even if the main structure does not suffer serious damage such as collapse, the large residual deformation will make post-earthquake repair difficult and the economic and time costs will be high.

[0005] Therefore, it is necessary to design an embedded prestressed carbon fiber self-resetting anti-buckling support that has energy dissipation capacity and can realize post-earthquake reset function, significantly reducing the economic and time costs of post-earthquake repair, in order to solve the current technical problems. Summary of the invention

[0006] In view of the deficiencies in the prior art, the present invention provides an embedded prestressed carbon fiber self-resetting anti-buckling support that has energy dissipation capability and can realize post-earthquake reset function, thereby significantly reducing the economic and time costs of post-earthquake repair.

[0007] The technical solution of the present invention is: an embedded prestressed carbon fiber self-resetting anti-buckling support, comprising:

[0008] Core material, used for yield energy dissipation under axial tension or compression;

[0009] A restraining body, which is sleeved on the outside of the core material and is used to restrain the buckling of the core material when it is under pressure;

[0010] An inner sleeve, the inner sleeve is sleeved on the outer side of the constraint body, two inner sleeve ear plates are arranged correspondingly on the upper and lower inner sides of one end of the inner sleeve, and an inner sleeve slot is opened correspondingly on the upper and lower sides of the other end of the inner sleeve;

[0011] An outer sleeve, the outer sleeve is sleeved on the outer side of the inner sleeve, and an outer sleeve ear plate corresponding to the inner sleeve slot is arranged on the inner side of one end of the outer sleeve;

[0012] A prestressed component, wherein the prestressed component has sealing plates abutting against two ends of the outer sleeve, and a prestressed member is connected between the two sealing plates.

[0013] Both ends of the prestressed component are provided with prestressed anchors for anchoring it to the sealing plate; the end of the prestressed anchor away from the prestressed component is provided with a screw rod, and the screw rod is equipped with a nut, and the nut connects the screw rod to the sealing plate.

[0014] The prestressed member is a carbon fiber rib or a tension rod.

[0015] The inner sleeve ear plate and the outer sleeve ear plate are respectively vertically fixedly connected to the two ends of the core material; the outer sleeve ear plate is slidably arranged inside the inner sleeve slot, and there is a deformation reserved space between the outer sleeve ear plate and the inner end of the inner sleeve slot.

[0016] The shape of the sealing plate matches the cross section of the outer cylinder, and the inner sleeve ear plate, the outer sleeve ear plate and the end of the core material all penetrate the corresponding sealing plate.

[0017] The restraining body is a concrete restraining body cast on the outside of the core material and matched with the inside of the inner sleeve.

[0018] The embedded prestressed carbon fiber self-resetting anti-buckling support is assembled by the following method:

[0019] S1, sequentially sleeve the inner sleeve and the outer sleeve onto the outer side of the core material;

[0020] S2, fixing the inner sleeve ear plate and the outer sleeve ear plate to two ends of the core material respectively;

[0021] S3, fixing the inner sleeve ear plate inside the inner sleeve, and fixing the outer sleeve ear plate inside the outer sleeve;

[0022] S4, inserting the prestressed component into the space between the core material and the inner sleeve for positioning, installing the sealing plate, tensioning the prestressed component to a designed prestressing force value, and then anchoring the end of the prestressed component to the sealing plate;

[0023] S5, pouring concrete inside the inner sleeve to form the constraint body surrounding the core material.

[0024] Beneficial effects of the present invention:

[0025] (1) In the present invention, by setting a prestressed component and applying prestress, after the core material yields and consumes energy under tension or compression during an earthquake, a restoring force is provided for the core material to perform post-earthquake restoration, thereby reducing the economic and time costs of post-earthquake repair;

[0026] (2) The prestressed component is placed inside the inner sleeve, and both ends of the prestressed component are connected to the sealing plate, which can effectively protect the prestressed component from adverse loads such as lateral impact and fire, thereby improving the structural safety;

[0027] (3) By setting the inner sleeve and the outer sleeve and fixing the two ends of the core material respectively, the inner sleeve and the outer sleeve of the embedded prestressed carbon fiber self-resetting buckling-restrained support can be relatively displaced during the tension and compression process of the whole structure, driving the prestressed component to form a continuous tension mechanism, providing restoring force after unloading, and realizing post-earthquake reset. BRIEF DESCRIPTION OF THE DRAWINGS

[0028] Figure 1 It is a schematic diagram of the overall and disassembled structures of the embedded prestressed carbon fiber self-resetting anti-buckling support in the present invention.

[0029] Figure 2 This is one of the overall structural schematic diagrams of the assembly process of the embedded prestressed carbon fiber self-resetting anti-buckling support in the present invention.

[0030] Figure 3 This is the second overall structural schematic diagram of the assembly process of the embedded prestressed carbon fiber self-resetting anti-buckling support in the present invention.

[0031] Figure 4 This is the third overall structural schematic diagram of the assembly process of the embedded prestressed carbon fiber self-resetting anti-buckling support in the present invention.

[0032] Figure 5 It is a schematic diagram of the overall structure of the embedded prestressed carbon fiber self-resetting anti-buckling support in the present invention.

[0033] Figure 6 It is a schematic diagram of the partial structure of the embedded prestressed carbon fiber self-resetting anti-buckling support in the present invention.

[0034] Figure 7It is a schematic diagram of the overall structure of the deformation mechanism of the embedded prestressed carbon fiber self-resetting anti-buckling support in the present invention.

[0035] Figure 8 This is one of the partial structural schematic diagrams of the deformation mechanism of the embedded prestressed carbon fiber self-resetting buckling-restrained brace in the present invention.

[0036] Fig. 9 This is the second schematic diagram of the local structure of the deformation mechanism of the embedded prestressed carbon fiber self-resetting buckling-restrained support in the present invention. DETAILED DESCRIPTION

[0037] Various exemplary embodiments of the present invention will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is not intended to be any limitation on the present invention and its application or use. The present invention can be implemented in many different forms and is not limited to the embodiments described herein. These embodiments are provided to make the present invention thorough and complete and to fully express the scope of the present invention to those skilled in the art. It should be noted that unless otherwise specifically stated, the relative arrangement of the parts and steps, the composition of the materials, the numerical expressions and the numerical values ​​set forth in these embodiments should be interpreted as being merely exemplary and not as limitations.

[0038] The words "first", "second" and similar words used in the present invention do not indicate any order, quantity or importance, but are only used to distinguish different parts. The words "include" or "comprise" and similar words mean that the elements before the word include the elements listed after the word, and do not exclude the possibility of including other elements. "Up", "down", "left", "right" and the like are only used to indicate relative positional relationships. When the absolute position of the described object changes, the relative positional relationship may also change accordingly.

[0039] like Figures 1 to 9As shown, the embedded prestressed carbon fiber self-resetting anti-buckling support comprises: a core material 1, which is used for yielding energy dissipation under axial tension or compression; a constraint body 2, which is sleeved on the outside of the core material 1, and is used to constrain the buckling of the core material 1 when it is compressed; an inner sleeve 3, which is sleeved on the outside of the constraint body 2, and two inner sleeve ear plates 31 are correspondingly arranged on the upper and lower inner sides of one end of the inner sleeve 3, and an inner sleeve slot 32 is correspondingly opened on the upper and lower ends of the other end of the inner sleeve 3; an outer sleeve 4, which is sleeved on the outside of the inner sleeve 3, and an outer sleeve ear plate 41 corresponding to the inner sleeve slot 32 is arranged on the inner side of one end of the outer sleeve 4; a prestressed component, which has a sealing plate 6 abutting against the two ends of the outer sleeve, and a prestressed member 5 is connected between the two sealing plates 6; the whole of the embedded prestressed carbon fiber self-resetting anti-buckling support When the body is under tension, the inner sleeve 3 slides in the tensile direction, driving the core material 1 to stretch and deform, and dissipate energy by yielding under tension. As the inner sleeve 3 slides, the sealing plate 6 near the inner sleeve ear plate 31 side is separated from the outer sleeve 4, and the sealing plate 6 near the outer sleeve ear plate 41 side is pressed against the outer sleeve 4 and does not move, so that the prestressed component 5 stretches and deforms, providing reset capability when the external force is unloaded; when the whole is under compression, the inner sleeve 3 slides in the compressive direction, driving the core material 1 to compress and deform, and dissipate energy by yielding under compression, and the core material 1 is constrained by the concrete constraint body 2 to bend under compression, which is the same as when it is under tension; as the inner sleeve 3 slides, the sealing plate 6 near the outer sleeve ear plate 41 side is separated from the outer sleeve 4, and the sealing plate 6 near the inner sleeve ear plate 31 side is pressed against the outer sleeve 4 and does not move, so that the prestressed component 5 still stretches and deforms, providing reset capability when the external force is unloaded.

[0040] In the above embodiment, by setting up a prestressed component and applying prestress, after the core material 1 yields and consumes energy under tension or compression during an earthquake, a restoring force is provided for it to be reset after the earthquake, thereby reducing the economic and time costs of post-earthquake repair; the prestressed component 5 is placed inside the inner sleeve 3, and the two ends of the prestressed component 5 are connected to the sealing plate 6, which can effectively protect the prestressed component 5 from adverse loads such as lateral impact and fire, thereby improving the structural safety; by setting up the inner sleeve 3 and the outer sleeve 4 and fixing the two ends of the core material 1 respectively, the inner sleeve 3 and the outer sleeve 4 of the embedded prestressed carbon fiber self-resetting anti-buckling support can be relatively displaced during the tension and compression process of the whole body, driving the prestressed component 5 to form a continuous tension mechanism, providing a restoring force after unloading, and realizing post-earthquake reset.

[0041] In the above embodiment, the core material 1 is usually steel with a low yield point, which dissipates seismic energy through tensile and compressive yielding; the concrete constraint body 2 surrounding the core material is used to restrain the buckling of the core material 1 when it is under pressure, so that its tension and compression are isotropic, and the strength of the constraint body 2 should be enough to restrain the buckling of the core material 1 to avoid the constraint body 2 being crushed and causing the buckling constraint to fail; the sealing plate 6 is not fixedly connected to any component, and is only pressed against the ends of the inner sleeve 3 and the outer sleeve 4 after applying prestress through the prestressed member 5.

[0042] In some embodiments, both ends of the prestressed member 5 are provided with prestressed anchors 51 for anchoring it to the sealing plate; a screw rod 7 is provided on the end of the prestressed anchor 51 that is away from the prestressed member 5, and a nut 71 is assembled on the screw rod 7, and the nut 71 connects the screw rod 7 to the sealing plate 6; specifically, a circular hole matching the screw rod 7 is opened on the sealing plate 6, for the screw rod 7 to pass through and then install the nut 71 for anchoring.

[0043] In the above embodiment, as a specific implementation of the prestressed member 5, the prestressed member 5 is a carbon fiber tendon or a tie rod, and both ends of the carbon fiber tendon or the tie rod are matched with carbon fiber tendons or tie rod anchors; the carbon fiber tendon or tie rod anchor can be selected according to the diameter size and surface structure of the carbon fiber tendon or the tie rod. The anchor has a high anchoring efficiency; in this specific embodiment, a large diameter, smooth round surface carbon fiber tie rod is used, and wire clamp type inner and outer mold anchors can be used for anchoring; the connection between the carbon fiber tendon or the tie rod anchor and the screw 7 can be threaded; the internal thread is processed at the end of the carbon fiber tendon or the tie rod anchor, which matches the external thread of the screw 7 and can be directly connected; if the carbon fiber tendon or the tie rod anchor and the screw 7 cannot be directly connected due to size mismatch, an adapter can be processed for connection, that is, the two ends of the adapter are respectively processed with external threads and internal threads, which match the internal threads at the end of the carbon fiber tendon or the tie rod anchor and the external threads of the screw 7, respectively, for connection; more specifically, four prestressed members 5 are evenly arranged between the inner sleeve 3 and the core material 1.

[0044] In some embodiments, the inner sleeve ear plate 31 and the outer sleeve ear plate 41 are respectively vertically fixedly connected to the two ends of the core material 1; the outer sleeve ear plate 41 is slidably arranged inside the inner sleeve slot 32, and there is a deformation reserved space between the outer sleeve ear plate 41 and the inner end of the inner sleeve slot 32. The deformation reserved space enables the outer sleeve ear plate 41 to move inside the inner sleeve slot 32 when deformation is found in the core material 1.

[0045] In some embodiments, the shape of the sealing plate 6 matches the cross-section of the outer cylinder 4, and the inner sleeve ear plate 31, the outer sleeve ear plate 41 and the end of the core material 1 all pass through the corresponding sealing plate 6; specifically, a hole is opened in the middle of the sealing plate 6, through which the sleeve ear plate 31, the outer sleeve ear plate 41 and the end of the core material 1 can pass through the sealing plate 6.

[0046] In some embodiments, the constraint body 2 is a concrete constraint body cast on the outside of the core material 1 and matched with the inside of the inner sleeve 3. The strength of the concrete constraint body should be enough to constrain the buckling of the core material 1 to avoid the constraint body 2 from being crushed and causing the buckling constraint to fail.

[0047] In some embodiments, the embedded prestressed carbon fiber self-resetting buckling-resisting support is assembled by the following method:

[0048] S1, sequentially sleeve the inner sleeve 3 and the outer sleeve 4 onto the outer side of the core material 1;

[0049] S2, the inner sleeve ear plate 31 and the outer sleeve ear plate 41 are fixedly connected to the two ends of the core material 1 respectively;

[0050] S3, fix the inner sleeve ear plate 31 inside the inner sleeve 3, and fix the outer sleeve ear plate 41 inside the outer sleeve 4;

[0051] S4, insert the prestressed component into the space between the core material and the inner sleeve for positioning, install the sealing plate, tension the prestressed component to the designed prestressing force value, and then anchor the end of the prestressed component to the sealing plate;

[0052] S5, pouring concrete inside the inner sleeve to form a restraining body surrounding the core material.

[0053] In the above embodiment, specifically, the outer surface of the inner sleeve 3 and the inner surface of the outer sleeve 4 match, the two fit closely, and a low friction coefficient material is required to be used at the interface between the two to reduce mutual friction; since the outline of the outer sleeve 4 is larger than the outline of the inner sleeve 3, the outer sleeve ear plate 41 needs to pass through the inner sleeve slot 32 and be fixedly connected to the wall of the outer sleeve 4; the two ends of the core material 1 are fixedly connected to the inner sleeve ear plate 31 and the outer sleeve ear plate 41 by welding, and the inner sleeve ear plate 31 and the inner sleeve 3, and the outer sleeve ear plate 41 and the outer sleeve are fixedly connected. The sleeves 4 are fixedly connected by welding; the prestressed anchors 51 need to be installed in advance at both ends of the prestressed member 5 and anchored to form a whole, and the screw 7 is fixedly connected to the prestressed member 5 through the prestressed anchors 51; the selection, quantity and prestress level of the prestressed member 5 can be determined according to parameters such as the overall design yield force and energy consumption capacity requirements of the self-resetting anti-buckling support, and is designable; for pouring concrete, grouting holes need to be opened in advance on the wall surface of the inner sleeve 3 and the outer sleeve 4 at the same position, and the holes must be sealed after the concrete pouring is completed.

[0054] So far, various embodiments of the present invention have been described in detail. In order to avoid obscuring the concept of the present invention, some details known in the art are not described. Based on the above description, those skilled in the art can fully understand how to implement the technical solution disclosed here.

[0055] The above-mentioned embodiments only express some implementation methods of the present invention, and the description thereof is relatively specific and detailed, but it cannot be understood as limiting the scope of the invention patent. It should be pointed out that for ordinary technicians in this field, several modifications and improvements can be made without departing from the concept of the present invention, which all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be based on the attached claims.

Claims

1. An embedded prestressed carbon fiber self-resetting anti-buckling support, characterized in that: include: Core material, used for yield energy dissipation under axial tension or compression; A restraining body, which is sleeved on the outside of the core material and is used to restrain the buckling of the core material when it is under pressure; An inner sleeve, the inner sleeve is sleeved on the outer side of the constraint body, two inner sleeve ear plates are arranged on the inner side of one end of the inner sleeve, and an inner sleeve slot is opened on the other end of the inner sleeve. An outer sleeve, the outer sleeve is sleeved on the outer side of the inner sleeve, and an outer sleeve ear plate corresponding to the inner sleeve slot is arranged on the inner side of one end of the outer sleeve; A prestressed component, wherein the prestressed component has sealing plates abutting against two ends of the outer sleeve, and a prestressed member is connected between the two sealing plates.

2. The embedded prestressed carbon fiber self-resetting buckling-resistance brace according to claim 1 is characterized in that: Both ends of the prestressed member are provided with prestressed anchors for anchoring the prestressed member to the sealing plate; A screw rod is arranged on the end of the prestressed anchor away from the prestressed member, and a nut is assembled on the screw rod, and the nut connects the screw rod with the sealing plate.

3. The embedded prestressed carbon fiber self-resetting buckling-resistance brace according to claim 2 is characterized in that: The prestressed member is a carbon fiber rib or a tension rod.

4. The embedded prestressed carbon fiber self-resetting buckling-resistance brace according to claim 1 is characterized in that: The inner sleeve ear plate and the outer sleeve ear plate are respectively vertically fixedly connected to the two ends of the core material; the outer sleeve ear plate is slidably arranged inside the inner sleeve slot, and there is a deformation reserved space between the outer sleeve ear plate and the inner end of the inner sleeve slot.

5. The embedded prestressed carbon fiber self-resetting buckling-restrained brace according to claim 1, characterized in that: The shape of the sealing plate matches the cross section of the outer cylinder, and the inner sleeve ear plate, the outer sleeve ear plate and the end of the core material all penetrate the corresponding sealing plate.

6. The embedded prestressed carbon fiber self-resetting buckling-resistance brace according to claim 1, characterized in that: The restraining body is a concrete restraining body cast on the outside of the core material and matched with the inside of the inner sleeve.

7. The embedded prestressed carbon fiber self-resetting buckling-restrained brace according to claim 1, characterized in that: Assembled in the following way: S1, sequentially sleeve the inner sleeve and the outer sleeve onto the outer side of the core material; S2, fixing the inner sleeve ear plate and the outer sleeve ear plate to two ends of the core material respectively; S3, fixing the inner sleeve ear plate inside the inner sleeve, and fixing the outer sleeve ear plate inside the outer sleeve; S4, inserting the prestressed component into the space between the core material and the inner sleeve for positioning, installing the sealing plate, tensioning the prestressed component to a designed prestressing force value, and then anchoring the end of the prestressed component to the sealing plate; S5, pouring concrete inside the inner sleeve to form the constraint body surrounding the core material.

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