CN217461008U

CN217461008U - High-ductility FRP (fiber reinforced Plastic) -friction type self-resetting energy consumption device

Info

Publication number: CN217461008U
Application number: CN202121962031.7U
Authority: CN
Inventors: 许坤; 白玉磊; 席川; 贾俊峰
Original assignee: Beijing University of Technology
Current assignee: Beijing University of Technology
Priority date: 2021-08-20
Filing date: 2021-08-20
Publication date: 2022-09-20
Anticipated expiration: 2031-08-20

Abstract

The utility model discloses a high-ductility FRP-friction type self-resetting energy dissipation device, wherein two conical inner cores are positioned in a circular outer sleeve and are tightly attached to the circular outer sleeve, and the left end of a first conical inner core and the right end of a second conical inner core extend out of the outer sleeve and are respectively connected with a left end plate and a right end plate; the self-resetting system mainly comprises high-ductility FRP strips or whole-package FRP and a circular external sleeve, wherein when the strip FRP form is adopted, the FRP strips are uniformly distributed in the axis direction of the circular external sleeve and are tightly connected with the periphery of the circular external sleeve; when the FRP form of the whole bag is adopted, the FRP completely wraps the round external sleeve and is tightly attached to the round external sleeve, and the support has the advantages of good practicability, energy consumption capability, self-resetting capability and the like.

Description

High-ductility FRP (fiber reinforced Plastic) -friction type self-resetting energy consumption device

Technical Field

The utility model belongs to the technical field of structural engineering energy dissipation shock attenuation, specifically speaking relates to a high ductility FRP-friction type is from restoring to throne power consumption device

Background

The existence of the residual deformation of the bridge structure after the earthquake can seriously reduce the capability of the structure for resisting the aftershock, and the reinforcing and maintaining cost of the bridge structure after the earthquake is increased, even the bridge structure needs to be overturned for reconstruction, thereby causing huge economic loss. In order to reduce the residual displacement of the structure after the earthquake, students propose different types of self-resetting energy-consuming supports. The system consumes earthquake input energy through the energy consumption device, protects the safety of the main structure, and simultaneously provides self-restoring force through the additional self-restoring device so as to reduce or even eliminate the residual deformation of the structure and ensure that the structure can restore the use function after earthquake. The additional self-resetting energy consumption device can improve the energy consumption performance of the structure and reduce the residual displacement of the structure after the earthquake, so that the additional self-resetting energy consumption device is favored by many experts and scholars. Common energy consumption systems are mainly divided into three categories, namely steel plastic deformation energy consumption, friction energy consumption and viscoelastic material energy consumption. Compared with the viscous-elastic material energy consumption and the steel plastic deformation energy consumption, the friction energy consumption has more advantages: is insensitive to load frequency and surrounding environment, is relatively cheap, consumes large energy and is stable,

Can be repeatedly used and is simple to produce. The fatigue-resistant self-resetting system is mainly divided into two categories of Shape Memory Alloy (SMA) and elastic material (such as disc spring, spring and the like). However, SMA is expensive, and after the strain exceeds 8%, the phenomena of stress strengthening, plastic displacement reduction and rigidity reduction occur, which are easily affected by temperature, and the energy consumption capability of SMA is reduced with the increase of load frequency. And the spring type components are more and the installation is complex. The self-resetting support mostly adopts a single group of pre-pressing disc springs to provide restoring force, the axial deformation capacity of the disc springs cannot be fully utilized, large-scale loading equipment is needed in the process of pre-pressing the disc springs, and the requirement on the installation environment is high.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to solve one of the problems that prior art exists at least, provide one kind and have good from restoring to the throne and power consumption ability to install easily and change novel from restoring to the throne power consumption device.

In order to solve the technical problem, the utility model adopts the following technical scheme:

a high-ductility FRP-friction type self-resetting energy dissipation device mainly comprises end plates at two ends, a friction energy dissipation system in the middle and an FRP self-resetting system;

the friction energy dissipation system is composed of a circular outer sleeve, a first conical inner core, a second conical inner core, a left end plate and a right end plate. The self-resetting system consists of FRP, a circular outer sleeve and a conical inner core; the first conical inner core and the second conical inner core are positioned in the circular outer sleeve and are tightly attached to the circular outer sleeve, the left end of the first conical inner core and the right end of the second conical inner core extend out of the circular outer sleeve and are respectively connected with the left end plate and the right end plate, and the FRP is wound and enclosed in the circumferential direction of the circular outer sleeve; the circular outer sleeve is surrounded by sixteen sector-shaped parts.

Specifically, the circular outer sleeve is formed by splicing 16 same fan-shaped components, and a first conical inner core and a second conical inner core of the circular outer sleeve are tightly attached.

Specifically, first toper inner core left end stretches out circular outer sleeve and is connected with the left end board, second toper inner core right-hand member stretches out circular outer sleeve and is connected with the right end board, and first toper inner core and second toper inner core all can move in the sleeve, and when both end plates received the extrusion, the motion of end plate extrusion toper inner core simultaneously, in order to avoid the inner core to appear stress concentration phenomenon when sliding in outer casing groove track, toper inner core edge and outer casing groove track edges and corners adopt the arc design. The edges of the first conical inner core and the second conical inner core are in fillet transition.

The self-resetting system consists of FRP and a circular outer sleeve, wherein the FRP can be divided into two forms of an FRP strip and an FRP whole package;

specifically, in the FRP strip form, the FRP strips surround the circular sleeve and are tightly connected with the outer sleeve, the FRP strips are uniformly distributed on the periphery of the circular sleeve, and in the FRP whole-pack form, the FRP wraps the whole outer sleeve and is tightly connected with the circular outer sleeve. The FRP is wound and enclosed in the circumferential direction of the circular outer sleeve.

Specifically, the fiber directions of the FRP are both up and down in the drawing.

The utility model discloses a theory of operation as follows:

when the support is not acted by external load or the external load is smaller than the horizontal component of the friction force between the conical inner core and the circular outer sleeve, the conical inner core does not slide in the track of the outer sleeve. The horizontal distance between the left conical inner core and the right conical inner core and the distance between the 16 components of the circular outer sleeve are kept unchanged. When the external load borne by the support is larger than the horizontal component of the friction force between the conical inner core and the outer sleeve, the conical inner core and the circular outer sleeve slide. When the tapered inner core is pulled in the circular outer sleeve rail to slide, the distance between the 16 components of the circular outer sleeve is increased due to the existence of the tapered angle, the radius of the whole circular outer sleeve is increased, the FRP is pulled, and the FRP can give pressure to the outer sleeve, so that the pressure between the inner core and the circular outer sleeve is increased. The restoring force provided by the FRP and the friction force between the inner core and the outer sleeve are increased along with the increase of the tension displacement, namely along with the increase of the tension displacement, the energy consumption capability and the self-resetting capability are improved. Because the left inner core and the right inner core have the same structure and the same displacement load value, the component forces of the reaction force of the two conical inner cores on the circular outer sleeve in the horizontal direction and the vertical direction are equal in magnitude and opposite in direction, so that the circular outer sleeve is in a self-balancing state. When the FRP strip is pulled, the maximum deformation of the support is mainly determined by the restraining force of the FRP strip and half of the horizontal size of the tapered inner core. After the tensile load is unloaded, due to the existence of the core taper angle, the restoring force provided by the FRP strip or the whole package of FRP can 'pinch' the tapered core back to the original position along the groove track of the circular outer sleeve, and the support realizes the full self-resetting capability. When the support is pressed to work, the left conical inner core and the right conical inner core slide to approach each other along the outer sleeve groove track under the action of external load, the distance between the 16 components of the circular outer sleeve is the same as the support tension, the radius of the whole circular outer sleeve is increased along with the increase of the support deformation, and the FRP constraint force is also increased. With the increase of the compression displacement, the supporting energy consumption capability and the self-resetting capability are improved. The maximum amount of deformation supported under compression depends on the horizontal distance between the left and right inner cores and the effective restraining force of the FRP. When the device is unloaded, the inner core returns to the original position along the track by the constraint force of the FRP, and the support realizes the full self-resetting capability. The support can realize energy consumption and complete self-resetting effect through a simple mechanical principle by the aid of a support working mechanism.

Compared with the prior art, the utility model discloses the beneficial effect who has lies in:

(1) the utility model discloses well support simple structure easily makes and installs, need not to change after shaking, and the supporting component generally can adopt materials processing preparation such as steel, aluminum product to form, and the cost is also relatively cheaper, has higher use value and economic benefits.

(2) The utility model provides a high ductility FRP has great fracture and meets an emergency, consequently has very high ductility.

(3) The utility model discloses in provide from characteristics such as high ductility FRP of reset ability still has light weight, high strength corrosion resistance, consequently make to compare in current support, can greatly reduced weight, convenient transportation. Meanwhile, the method can also be applied to acidic environments such as oceans.

(4) The utility model discloses a friction energy dissipation system has to load frequency and surrounding environment insensitive, cheap relatively, consume energy big and stable, reuse and produce advantages such as simple and fatigue-resistant.

(5) The utility model discloses homoenergetic reaches good shock attenuation effect under the environment of difference, and can realize the design of the accurate antidetonation of many levels, and utility model discloses utilize the frictional force of outer sleeve and toper inner core to form the friction power consumption mechanism, reduce the damage of structure, realize from the reset function through the FRP strip simultaneously, reduce the structure residual deformation.

Drawings

In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required to be used in the description of the embodiments will be briefly introduced below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic structural diagram of a high-ductility whole-pack FRP-friction type self-resetting energy dissipation device according to an embodiment of the present invention;

fig. 2 is a schematic structural diagram of a high-ductility strip FRP-friction type self-resetting energy dissipation device according to an embodiment of the present invention;

fig. 3 is a schematic structural view of a tapered core according to an example of the present invention;

fig. 4 is a schematic view of an external sleeve structure according to an example of the present invention;

fig. 5 is a schematic view of an external sleeve structure according to an example of the present invention;

fig. 6 is a schematic view of a tapered inner core and outer sleeve connection involved in an example of the present invention;

wherein 1, a first conical inner core; 2. a second tapered inner core; 3. a circular outer sleeve; 4. wholly wrapping FRP; 5. strip FRP; 6. a left end plate; 7. and a right end plate.

Detailed Description

The technical solution of the present invention will be described in detail and completely with reference to the drawings in the present invention, and all other embodiments obtained by those skilled in the art without creative work belong to the protection scope of the present invention based on the embodiments of the present invention. In the description of the present invention, the terms "length", "width", "thickness", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", and the like indicate the orientation or positional relationship based on that shown in the drawings, and are only for convenience of description and simplicity of description, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be construed as limiting the present 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.

As shown in fig. 1 and 2, the present embodiment provides a novel self-resetting sliding friction support system, which mainly includes a first tapered inner core, a second tapered inner core, a circular outer sleeve, an FRP strip set or a complete package of FRP, a left end plate, and a right end plate. The components form an energy consumption system and a self-resetting system of the support system according to respective functions and actions.

The energy consumption system mainly comprises a first conical inner core, a second conical inner core and a circular outer sleeve. The circular outer sleeve clamps the two conical inner cores in the middle, and the two conical inner cores can move left and right relatively. The conical inner cores penetrate through the circular outer sleeve part cylinder to be connected with the two end plates, one ends of the two conical inner cores are not in contact, the two conical inner cores can move freely, and the conical inner cores are suitable for the deformation capacity of a building structure. The friction force generated when the two conical inner cores and the outer sleeve move relatively provides an energy consumption effect, the larger the relative displacement is, the larger the positive pressure of the contact between the inner cores and the outer sleeve is, the larger the friction force is, and the energy consumption capability is also improved.

The middle of the round external sleeve is provided with a conical groove matched with the first conical inner core and the second conical inner core, and the round external sleeve is connected with the first conical inner core and the second conical inner core in a matched mode through the groove.

In this embodiment, in order to avoid the phenomenon of stress concentration when the tapered inner core slides in the outer sleeve groove track, the arc design is adopted at the edge of the tapered inner core and the edge of the outer sleeve groove track.

The self-reset system mainly comprises an outer sleeve and FRP strips or FRP bags symmetrically arranged on the periphery of the outer sleeve. Whether the full package of FRP or the strip FRP is tightly attached to the periphery of the circular outer sleeve, the FRP strip and the full package of FRP should be pre-tensioned to provide sufficient restoring force.

In the embodiment, the strip FRP or the whole package of FRP provides enough restoring force, the self-resetting capability of the structure is ensured, the residual deformation of the structure is reduced, and the post-earthquake restoring capability of the structure is improved.

In the implementation, the trend of the FRP is up and down, so that the FRP can exert the maximum mechanical property when the support is stressed.

The conical inner core and the end plate are connected in a welding mode. The FRP and the outer sleeve are bonded by epoxy resin.

In this embodiment, factors affecting the support performance include the angle of the tapered inner core, the friction coefficient between the inner core and the outer sleeve, the initial pre-tightening force of the FRP, and the stiffness of the FRP. After unloading, the rigidity and the restoring force are increased along with the increase of the angle of the conical inner core, and from the energy consumption angle, the energy consumption capacity of the support is also increased along with the increase of the angle of the conical inner core. And with the increase of the friction coefficient and the initial pre-tightening force of the FRP, the energy consumption capacity of the support is increased. The self-resetting capability of the support is mainly influenced by the rigidity of the FRP, and the larger the rigidity is, the better the self-resetting capability is. In the actual design, the parameters can be adjusted by self to take the economic benefit and the structural effect into consideration.

The above examples are merely illustrative of the present invention clearly and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. Nor is it intended to be exhaustive of all embodiments. And obvious changes and modifications may be made without departing from the scope of the present invention.

Claims

1. The utility model provides a high ductility FRP-friction type is from restoring to throne power consumption device which characterized in that: the system comprises a friction energy consumption system and a self-resetting system; the friction energy dissipation system consists of a circular outer sleeve, a first conical inner core, a second conical inner core, a left end plate and a right end plate; the self-resetting system consists of FRP, a circular outer sleeve and a conical inner core; the first conical inner core and the second conical inner core are positioned in the circular outer sleeve and are tightly attached to the circular outer sleeve, the left end of the first conical inner core and the right end of the second conical inner core extend out of the circular outer sleeve and are respectively connected with the left end plate and the right end plate, and the FRP is wound and enclosed in the circumferential direction of the circular outer sleeve; the circular outer sleeve is surrounded by sixteen sector-shaped parts.

2. The high-ductility FRP-friction type self-resetting energy dissipating device as claimed in claim 1, wherein: the first conical inner core and the second conical inner core are identical.

3. The high-ductility FRP-friction type self-resetting energy dissipating device as claimed in claim 1 or 2, wherein: the edges of the first conical inner core and the second conical inner core are in fillet transition.

4. The high ductility FRP-friction type self-resetting energy dissipation device of claim 3, wherein: the form of the FRP comprises a whole package of FRP and a strip of FRP; when the strip FRP form is adopted, the strip FRP is uniformly distributed in the axial direction of the circular outer sleeve; when the form of the whole package of FRP is adopted, the whole package of FRP completely wraps the periphery of the circular outer sleeve.

5. The high ductility FRP-friction type self-resetting energy dissipation device of claim 4, wherein: the FRP strips or the whole package of FRP are pre-tensioned.