CN215759741U - Self-resetting energy dissipation support based on large strain FRP - Google Patents
Self-resetting energy dissipation support based on large strain FRP Download PDFInfo
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- CN215759741U CN215759741U CN202121962505.8U CN202121962505U CN215759741U CN 215759741 U CN215759741 U CN 215759741U CN 202121962505 U CN202121962505 U CN 202121962505U CN 215759741 U CN215759741 U CN 215759741U
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Abstract
The utility model discloses a self-resetting energy-consuming support based on large-strain FRP, which comprises: the friction energy dissipation system consists of an upper outer sleeve, a lower outer sleeve, a first wedge-shaped inner core, a second wedge-shaped inner core, a left end plate and a right end plate. The two wedge-shaped inner cores are positioned in the upper outer sleeve and the lower outer sleeve and are tightly attached to the upper outer sleeve and the lower outer sleeve, and the left end of the first wedge-shaped inner core and the right end of the second wedge-shaped inner core extend out of the outer sleeves to be respectively connected with the left end plate and the right end plate; the self-resetting system consists of an FRP strip or a whole package of FRP and an upper outer sleeve and a lower outer sleeve, wherein the FRP is large strain FRP, and when a strip FRP form is adopted, the FRP strip is uniformly distributed on two sides of the upper outer sleeve and the lower outer sleeve, the upper end of the FRP strip is tightly connected with the top end of the upper outer sleeve, and the lower end of the FRP strip is tightly connected with the bottom end of the lower outer sleeve; when the form of the whole package of FRP is adopted, the FRP completely wraps the upper outer sleeve and the lower outer sleeve, the upper end of the FRP is tightly connected with the top end of the upper outer sleeve, the lower end of the FRP is tightly connected with the bottom end of the lower outer sleeve, and the support has good practicability, energy consumption capability and self-resetting capability.
Description
Technical Field
The utility model belongs to the technical field of energy dissipation and shock absorption of structural engineering, and particularly relates to a novel self-resetting energy dissipation support based on large-strain FRP.
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: the device is insensitive to load frequency and surrounding environment, relatively cheap, large and stable in energy consumption, reusable and 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 prepressing 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 prepressing the disc springs, and the requirement on the installation environment is high.
Disclosure of Invention
The present invention is directed to solve at least one of the problems of the prior art, and provides a novel self-resetting sliding friction brace with good self-resetting and energy consumption capabilities, and easy installation and replacement.
In order to solve the technical problems, the utility model adopts the following technical scheme:
a novel self-resetting energy dissipation support based on large strain FRP is mainly composed of 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 an upper outer sleeve, a lower outer sleeve, a first wedge-shaped inner core, a second wedge-shaped inner core, a left end plate and a right end plate.
Specifically, the upper outer sleeve is tightly attached to the upper portions of the first wedge-shaped inner core and the second wedge-shaped inner core, the lower outer sleeve is tightly attached to the lower portions of the first wedge-shaped inner core and the second wedge-shaped inner core, and the upper outer sleeve and the lower outer sleeve are identical in structure and are vertically symmetrical about a central axis.
Specifically, the first wedge inner core left end stretches out upper and lower portion outer sleeve and is connected with the left end board, the second wedge inner core right end stretches out upper and lower portion outer sleeve and is connected with the right end board, and first wedge inner core and second wedge inner core all can move in the sleeve, and when both end boards received the extrusion, the end board extruded wedge inner core simultaneously and moved, in order to avoid the inner core to appear stress concentration phenomenon when sliding in the outer tube recess track, wedge inner core edge and outer tube recess track edges and corners adopt the arc design.
The self-resetting system consists of FRP, an upper outer sleeve and a lower outer sleeve, wherein the FRP can be divided into two forms of an FRP strip and an FRP whole package;
specifically, the FRP is large strain FRP, the fracture strain is large, and the ductility is good.
Specifically, the upper end of the FRP strip in the FRP strip form is tightly connected with the upper outer sleeve, the lower end of the FRP strip in the FRP strip form is tightly connected with the lower outer sleeve, the FRP strip is uniformly distributed on two sides of the upper outer sleeve and the lower outer sleeve, the FRP in the FRP whole package form wraps the whole outer sleeve, and the upper part and the lower part of the FRP strip are tightly connected with the outer sleeve.
Specifically, the fiber directions of the FRP are both up and down in the drawing.
The working principle of the utility model is 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 wedge-shaped inner core and the upper outer sleeve and the lower outer sleeve, the inner core does not slide in the groove track of the outer sleeve. The horizontal distance between the left wedge-shaped inner core and the right wedge-shaped inner core of the support and the vertical distance between the upper outer sleeve and the lower 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 inner core and the outer sleeve, the inner core and the outer sleeve slide. When the wedge-shaped inner core is pulled in the groove tracks of the upper outer sleeve and the lower outer sleeve to slide, the vertical distance between the upper outer sleeve and the lower outer sleeve is increased due to the existence of the wedge-shaped angle, the strip FRP is pulled, otherwise, a pressure is given to the outer sleeve, and the pressure between the inner core and the outer sleeve is increased. The restoring force provided by the strip FRP and the friction force between the inner core and the outer sleeve are increased along with the increase of the tension displacement, namely, the energy consumption capability and the self-resetting capability are improved along with the increase of the tension displacement. Because the left inner core and the right inner core have the same structure and the same displacement load value, the components of the reaction force of the two wedge-shaped inner cores on the upper outer sleeve and the lower outer sleeve in the horizontal direction and the vertical direction are equal in magnitude and opposite in direction, so that the upper outer sleeve and the lower outer sleeve are in a self-balancing state. When the FRP is tensioned, the maximum deformation of the support is mainly determined by the binding force of the FRP and half of the horizontal size of the inner core. After the tensile load is unloaded, due to the wedge-shaped angle of the inner core, the restoring force provided by the strip FRP or the whole package of FRP enables the wedge-shaped inner core to be 'pinched' back to the original position along the groove track of the outer sleeve, and the support achieves the full self-resetting capability. When the support is pressed to work, the left wedge-shaped inner core and the right wedge-shaped inner core slide and approach each other along the groove track of the outer sleeve under the action of external load, the vertical distance between the upper outer sleeve and the lower outer sleeve is increased along with the increase of the support deformation as well as the increase of the FRP constraint force as the support is pulled. 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 cores and the effective restraining force of the FRP strip. 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 has the beneficial effects that:
(1) the support structure is simple, easy to manufacture and install, and does not need to be replaced after the earthquake, the support component can be generally made of steel, aluminum and other materials, the manufacturing cost is relatively low, and the support structure has high use value and economic benefit.
(2) The FRP in the utility model is large in large strain, and the breaking strain of the FRP is not less than 5%, so that the FRP has good ductility.
(3) The high-strain FRP with self-resetting capability provided by the utility model also has the characteristics of light weight, high strength, corrosion resistance and the like, so that compared with the existing support, the weight can be greatly reduced, and the transportation is convenient. Meanwhile, the method can also be applied to acidic environments such as oceans and the like.
(4) The friction energy dissipation system is adopted, and the friction energy dissipation device has the advantages of insensitivity to load frequency and surrounding environment, relative cheapness, large and stable energy dissipation, reusability, simple production, fatigue resistance and the like.
(5) The utility model can achieve good shock absorption effect in different environments, can realize multi-level anti-seismic design, forms a friction energy dissipation mechanism by utilizing the friction force of the outer sleeve and the wedge-shaped inner core, reduces the damage of the structure, and simultaneously realizes the self-resetting function through large strain FRP, and reduces the residual deformation of the structure.
Drawings
In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings needed 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 it is obvious for those skilled in the art to obtain other drawings based on these drawings without creative efforts.
FIG. 1 is a schematic structural view of an FRP complete package self-resetting sliding friction support according to an embodiment of the present invention;
FIG. 2 is a schematic structural view of an FRP strip self-resetting sliding friction support according to an embodiment of the present invention;
FIG. 3 is a schematic structural view of a wedge-shaped core involved in an example of the present invention;
FIG. 4 is a schematic view of a lower outer sleeve construction involved in an example of the present invention;
FIG. 5 is a schematic view of the connection of a wedge-shaped inner core and a lower outer sleeve involved in an example of the present invention;
FIG. 6 is a schematic view of the wedge-shaped inner core, lower outer sleeve, and end plate connection involved in an example of the present invention;
wherein 1, a first wedge-shaped inner core; 2. a second wedge-shaped inner core; 3. a lower outer sleeve; 4. an upper outer sleeve; 5. wholly wrapping FRP; 6. strip FRP; 7. a left end plate; 8. 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 accompanying drawings, and all other embodiments obtained by those skilled in the art without any inventive work based on the embodiments of the present invention are within the scope of the present invention. In the description of the present invention, the terms "length," "width," "thickness," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like, indicate an orientation or positional relationship that is based on what is shown in the figures, and are used merely for convenience in describing and simplifying the utility model, but do not indicate or imply that the device or element so referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore should not be taken as limiting the utility model. 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 wedge-shaped inner core, a second wedge-shaped inner core, an upper outer sleeve, a lower outer sleeve, an FRP strip set or complete 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 wedge-shaped inner core, a second wedge-shaped inner core, an upper outer sleeve and a lower outer sleeve. The upper outer sleeve and the lower outer sleeve clamp the two wedge-shaped inner cores in the middle, and the two wedge-shaped inner cores can move left and right relatively. The wedge-shaped inner cores penetrate through the upper outer sleeve and the lower outer sleeve to be connected with the two end plates, one ends of the middles of the two wedge-shaped inner cores are not contacted, the two wedge-shaped inner cores can move freely, and the wedge-shaped inner cores can adapt to the deformation capacity of a building structure. The friction force generated when the two wedge-shaped 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 upper outer sleeve and the lower outer sleeve is provided with a wedge-shaped groove matched with the first wedge-shaped inner core and the second wedge-shaped inner core, and the upper outer sleeve and the lower outer sleeve are matched and connected with the first wedge-shaped inner core and the second wedge-shaped inner core through the grooves.
In this embodiment, to avoid the phenomenon of stress concentration when the wedge-shaped inner core slides in the outer casing groove track, arc-shaped design is adopted at the edge of the wedge-shaped inner core and the edge of the outer casing groove track.
The self-resetting system mainly comprises an outer sleeve and strip FRP or whole package FRP symmetrically arranged on the upper side and the lower side of the outer sleeve. Both the complete package of FRP and the strip FRP are tightly connected with the top of the upper outer sleeve and the bottom of the lower outer sleeve, and the strip FRP and the complete package of FRP are pre-tensioned to provide sufficient restoring force.
In this example, the high strain FRP is used, and the fracture strain thereof is larger than that of the conventional FRP, and the high strain FRP has good ductility.
In the embodiment, the FRP strip or the whole package of FRP provides enough restoring force, so that the self-restoring capacity of the structure is ensured, the residual deformation of the structure is reduced, and the post-earthquake restoring capacity of the structure is improved.
In the implementation, the trend of the large-strain FRP is up and down, so that the FRP can exert the maximum mechanical property when the support is stressed.
The wedge-shaped inner core and the end plate are connected in a welding mode. The connection of the large strain FRP and the outer sleeve is bonded by epoxy resin.
In this embodiment, factors affecting the support performance include the angle of the wedge-shaped inner core, the friction coefficient between the inner core and the outer sleeve, the initial FRP pre-tightening force, and the FRP stiffness. After unloading, the rigidity and the restoring force are increased along with the increase of the angle of the wedge-shaped 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 wedge-shaped inner core. And with the increase of the friction coefficient and the initial pretightening force of the FRP strip, the energy consumption capacity of the support is increased. The FRP rigidity mainly influences the self-resetting capability of the support, 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 economic benefits and structural effects into consideration.
The above examples are merely illustrative for clearly illustrating the present invention 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 variations or modifications of the utility model may be made without departing from the scope of the utility model.
Claims (6)
1. The utility model provides a from energy consumption support that restores to throne based on big FRP that meets an emergency which characterized in that: the system comprises a friction energy consumption system and a self-resetting system; the friction energy dissipation system comprises an upper outer sleeve, a lower outer sleeve, a first wedge-shaped inner core, a second wedge-shaped inner core, a left end plate and a right end plate; the self-resetting system comprises FRP, an upper outer sleeve, a lower outer sleeve and an inner core; the first wedge-shaped inner core and the second wedge-shaped inner core are positioned in the upper outer sleeve and tightly attached to the upper outer sleeve, and the second wedge-shaped inner core is positioned in the lower outer sleeve and tightly attached to the lower outer sleeve; the left end of the first wedge-shaped inner core and the right end of the second wedge-shaped inner core respectively extend out of the upper outer sleeve and the lower outer sleeve and are respectively connected with the left end plate and the right end plate; the FRP is wound along the circumferential direction of the upper outer sleeve and the lower outer sleeve; the FRP breaking strain of the FRP is not less than 5%.
2. The self-resetting energy-consuming support based on the high-strain FRP as claimed in claim 1, wherein: the first wedge-shaped inner core and the second wedge-shaped inner core are identical.
3. The self-resetting energy-consuming support based on the high-strain FRP as claimed in claim 2, wherein: the first wedge-shaped inner core and the second wedge-shaped inner core can freely move between the upper outer sleeve and the lower outer sleeve.
4. The self-resetting energy-consuming support based on the high-strain FRP as claimed in claim 3, wherein: the edges of the first wedge-shaped inner core and the second wedge-shaped inner core are in round corner transition.
5. The self-resetting energy-consuming support based on the high-strain FRP as claimed in claim 4, wherein: the form of the FRP comprises whole package FRP and strip FRP; when the strip FRP is adopted, the strip FRP is uniformly distributed along the axial direction of the upper outer sleeve and the lower outer sleeve.
6. The self-resetting energy-consuming support based on the high-strain FRP as claimed in claim 5, wherein: the FRP is pre-tensioned FRP.
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| CN202121962505.8U CN215759741U (en) | 2021-08-20 | 2021-08-20 | Self-resetting energy dissipation support based on large strain FRP |
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| CN202121962505.8U CN215759741U (en) | 2021-08-20 | 2021-08-20 | Self-resetting energy dissipation support based on large strain FRP |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508039A (en) * | 2022-02-23 | 2022-05-17 | 浙江大学 | Friction type damping device with energy consumption and limiting functions |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114508039A (en) * | 2022-02-23 | 2022-05-17 | 浙江大学 | Friction type damping device with energy consumption and limiting functions |
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