A rotary self-centering frictional sliding joint

Abstract

The present application relates to a kind of rotary self-resetting friction slip joint, belong to civil engineering seismic mitigation technology field.The friction piece of two groups of relative sliding, combined disc spring and a high-strength bolt are included;Two groups of relative sliding friction piece are buckled together, while being connected in series on a high-strength bolt;Friction piece outside on the high-strength bolt is also tightly sleeved with the combined disc spring, and pre-tightening force is applied to friction piece;Each group of friction piece includes an outer friction piece and an inner friction piece, and a plurality of fan-shaped body serrated projections are arranged thereon;The inner side of outer friction piece and the outer side of inner friction piece are provided with wedge-shaped protrusions.The present application can effectively solve the problem of energy dissipation and self-resetting simultaneously.

Description

TECHNICAL FIELD

[0001] The present application relates to a rotary self-resetting frictional sliding joint, belonging to the technical field of civil engineering seismic mitigation. BACKGROUND

[0002] Earthquake disasters have the characteristics of suddenness and unpredictability, and are the natural disasters that cause the most casualties in China. In particular, during moderate and major earthquakes, a large amount of seismic energy is released, causing irreversible damage to structures, and even collapse, which seriously endangers people's lives and property safety.

[0003] For seismic action, China has set up four levels of fortification, which divides earthquakes into four categories: "frequent earthquake", "basic earthquake", "rare earthquake" and "extremely rare earthquake". Four fortification targets are proposed for the four levels of earthquakes: "normal use", "immediate post-earthquake use", "replaceable and repairable", and "non-collapse and no death".

[0004] Energy dissipation technology dissipates the energy in the structure subjected to earthquake input by generating plastic hysteresis deformation such as friction and bending in the energy dissipation device, thereby controlling the damage of the main structure. At the same time, energy dissipation technology also has the advantages of maintenance simplicity and economy, which traditional seismic strategies do not have, and has been widely used in research and practical engineering.

[0005] Self-resetting structures can effectively control the maximum deformation of the structure during an earthquake and the residual deformation of the structure after an earthquake, and can be restored to use without repair or with slight repair after an earthquake.

[0006] Existing self-resetting energy dissipation components achieve the "replaceable and repairable" fortification target under "rare earthquake", but for other earthquake levels, especially under "frequent earthquake" and "basic earthquake", their energy dissipation function is not significant and the components have no self-resetting capability. Unlike traditional self-resetting energy dissipation components, variable hysteresis performance components can change their hysteresis performance according to the size of the external load, and can effectively achieve different levels of fortification targets under different levels of earthquake.

[0007] Therefore, it is necessary to design a self-resetting joint with good energy dissipation capability and self-resetting capability, as well as variable hysteresis performance. SUMMARY

[0008] Based on the above-mentioned defects of the prior art, the present application provides a rotary self-resetting frictional sliding joint, which can be applied to the connection of support components of building structures and bridge structures to solve the problem of simultaneous energy dissipation and self-resetting, and to control earthquakes by classification.

[0009] To solve the above problems, the present application adopts the following technical scheme:

[0010] A rotary self-resetting frictional sliding joint comprises two sets of friction plates that can slide relative to each other, a combined disc spring, and a high-strength bolt; the two sets of friction plates are buckled together and connected in series on the high-strength bolt; the outer side of the friction plates on the high-strength bolt is further tightly sleeved with the combined disc spring to apply a pre-tightening force to the friction plates; the outer end of the combined disc spring is fixed or tightly pressed on the outer side of the high-strength bolt;

[0011] Each set of friction plates comprises an outer friction plate and an inner friction plate, and the two inner friction plates are buckled together relative to each other, and each inner friction plate is provided with a plurality of fan-shaped serrated protrusions on the inner side; the fan-shaped serrated protrusions on the two inner friction plates are arranged in an opposite staggered manner and can rotate relative to each other;

[0012] The outer friction plate is arranged on the outer side of the inner friction plate, and the inner side of the outer friction plate and the outer side of the inner friction plate are both provided with wedge-shaped protrusions; the wedge-shaped protrusions on the outer friction plate and the wedge-shaped protrusions on the inner friction plate are arranged in an opposite staggered manner and are integrated together, thereby being spliced into a cylindrical friction plate.

[0013] Further, the outer side of the outer friction plate is connected to the external structure through a connecting rod, which can drive the two sets of friction plates to rotate relative to each other.

[0014] Further, the pre-tightening force of the combined disc spring, the wedge-shaped height of the wedge-shaped protrusions, and the wedge-shaped angle of the wedge-shaped protrusions determine the opening and closing degree of the outer friction plate and the inner friction plate.

[0015] Further, the stiffness of the combined disc spring and the opening and closing degree of the outer friction plate and the inner friction plate determine the maximum rotation angle of the friction joint.

[0016] Further, the outer friction plate and the inner friction plate are integrally turned by turning.

[0017] Further, the fan-shaped serrated protrusions and the wedge-shaped protrusions are 3-6.

[0018] Further, the fan-shaped serrated protrusions and the wedge-shaped protrusions are evenly distributed along the circumference of the inner friction plate and the outer friction plate.

[0019] The rotary self-resetting frictional sliding joint can be applied to the connection between a support member and a bridge structure.

[0020] The working principle is that, when there is no external load, i.e. in the initial state, the wedge-shaped protrusions on the outer friction plate and the wedge-shaped protrusions on the inner friction plate are integrated in an opposite staggered manner;

[0021] When a small rotation angle is generated by external load, the relative rotation between the two inner friction plates occurs, and when the sector-shaped sawtooth protrusions on the inner friction plates are in close contact, the relative rotation between the two inner friction plates stops and is locked, and the process consumes energy through sliding friction, but has no self-resetting function, and the hysteresis curve is shuttle-shaped;

[0022] When a large deformation is generated by external load, the two inner friction plates first rotate until they are locked when a small deformation occurs, and then the outer friction plate and the inner friction plate start to rotate relative to each other as the rotation angle increases; during the rotation process, the wedge-shaped protrusions between the two plates produce oblique sliding and axial displacement, so that the outer friction plate and the inner friction plate gradually open, causing the outer friction plate to shift outward and compress the combined disc spring, and the process consumes energy through sliding friction and the elastic self-resetting function of the combined disc spring, and the hysteresis curve changes from shuttle-shaped to flag-shaped, realizing the function of variable hysteresis performance.

[0023] The beneficial effects of the present application are:

[0024] The present application can control the maximum rotation angle of the node by adjusting the wedge shape, and change the initial stiffness of the component by controlling the pre-stress applied to the combined disc spring. In addition, the energy dissipation capacity of the component can be changed by using materials with different friction coefficients to manufacture the component. When subjected to different external loads, the motion modes of the inner and outer friction plates are different, thereby changing the hysteresis performance of the component; when subjected to a small external load, only the relative motion between the two inner friction plates occurs, and the hysteresis curve is shuttle-shaped; when subjected to a large external load, the inner friction plates are locked when the relative motion reaches a certain angle, and the relative motion between the inner and outer friction plates occurs, and the hysteresis curve is flag-shaped; during the gradual increase of the external load, the hysteresis curve also gradually changes from shuttle-shaped to flag-shaped, thereby realizing the hierarchical control of multi-level fortification.

[0025] In addition, the present application can be applied to the support component connection of building structures and bridge structures. The node utilizes friction energy dissipation and provides self-resetting capability through the elasticity of the combined disc spring, and provides a certain initial stiffness by applying pre-stress to the combined disc spring. By controlling the size of the pre-stress, hierarchical control for earthquakes can be realized, and the load is borne under frequent earthquakes and basic earthquakes, and the hysteresis curve is shuttle-shaped; under rare earthquakes and extremely rare earthquakes, the load is borne, energy is dissipated, and self-resetting is performed, and the hysteresis curve changes from shuttle-shaped to flag-shaped. BRIEF DESCRIPTION OF DRAWINGS

[0026] Figure 1 is a schematic diagram of the rotating self-resetting friction sliding node structure of the present application;

[0027] Figure 2 is a schematic diagram of the rotating state of the rotating self-resetting friction sliding node of the present application;

[0028] Figure 3This is a diagram showing the rotation process of the rotary self-resetting friction sliding node under rotating conditions according to the present invention.

[0029] Figure 4 This is a schematic diagram of the external friction plate of the present invention;

[0030] Figure 5 This is a schematic diagram of the internal friction plate of the present invention;

[0031] Figure 6 The hysteresis curve formed by the rotary self-resetting friction sliding node of the present invention;

[0032] Figure 7 This is a schematic diagram of the connecting rod on the outer side of the external friction plate of the present invention. Detailed Implementation

[0033] To make the features of the present invention more intuitive, the embodiments of the present invention will be further described below with reference to the figures, but the present invention is not limited to the following embodiments.

[0034] like Figures 1-5 As shown, this invention discloses a rotary self-resetting friction sliding joint, applied at the connection of supporting components in building and bridge structures. The joint includes two sets of relatively sliding friction plates, a combined disc spring 3, and a high-strength bolt 2. The two sets of relatively sliding friction plates are fastened together and connected in series on the high-strength bolt 2. A combined disc spring 3 is also tightly fitted onto the outer side of the friction plates on the high-strength bolt 2 to apply preload to the friction plates. The outer end of the combined disc spring 3 is fixed to the outer side of the high-strength bolt 2.

[0035] Each set of friction plates includes an outer friction plate 1a and an inner friction plate 1b, both of which are integrally machined. The two inner friction plates 1b are snapped together, and each inner friction plate 1b has several fan-shaped sawtooth protrusions 4 on its inner side. These fan-shaped sawtooth protrusions 4 on the two inner friction plates 1b are staggered and can rotate relative to each other. Figure 7 As shown, the outer sides of the outer friction plates 1a are connected to the supporting components of the building structure and bridge structure via a connecting rod, which can drive the two sets of friction plates to rotate relative to each other.

[0036] The outer friction plate 1a is located outside the inner friction plate 1b, and both the inner side of the outer friction plate 1a and the outer side of the inner friction plate 1b are provided with wedge-shaped protrusions 5. The wedge-shaped protrusions 5 on the outer friction plate 1a and the wedge-shaped protrusions 5 on the inner friction plate 1b are staggered and attached to each other to form a cylindrical friction plate.

[0037] In this embodiment, the combined disc spring 3 pre-pressure, the wedge height of the wedge-shaped protrusion 5, and the wedge angle of the wedge-shaped protrusion 5 determine the opening and closing degree of the outer friction plate 1a and the inner friction plate 1b. The stiffness of the combined disc spring 3 and the opening and closing degree of the outer friction plate 1a and the inner friction plate 1b determine the maximum rotation angle of the friction joint.

[0038] As shown in Figures 1-5 The fan-shaped sawtooth protrusion 4 and the wedge-shaped protrusion 5 of this embodiment are both four, and are uniformly distributed along the circumference of the inner friction plate 1b and the outer friction plate 1a.

[0039] The application of the above-mentioned rotary self-resetting frictional sliding joint can be applied to the connection of support members of building structures and bridge structures.

[0040] The working principle is as follows: when there is no external load, that is, in the initial state, the wedge-shaped protrusions 5 on the outer friction plate 1a and the wedge-shaped protrusions 5 on the inner friction plate 1b are relatively staggered and integrated. When a small rotation angle is generated under external load, the two inner friction plates 1b rotate relative to each other, and when the fan-shaped sawtooth protrusions 4 on the inner friction plate are in contact, the two inner friction plates 1b no longer continue to rotate relative to each other and are locked. This process consumes energy through sliding friction, but has no self-resetting function, and the hysteresis curve is shuttle-shaped. When a large deformation is generated under external load, the two inner friction plates 1b first rotate until they are locked when a small deformation occurs, and then as the rotation angle increases, the outer friction plate 1a and the inner friction plate 1b begin to rotate relative to each other. During the rotation process, the wedge-shaped protrusions 5 produce diagonal sliding and axial displacement, thereby gradually opening the outer friction plate 1a and the inner friction plate 1b, causing the outer friction plate 1a to shift outward and compress the combined disc spring 3. This process consumes energy through sliding friction and achieves the self-resetting function of the member through the elasticity of the combined disc spring 3, and the hysteresis curve changes from shuttle-shaped to flag-shaped, achieving the function of variable hysteresis performance. The hysteresis curve is shown in Figure 6 .

[0041] The above is only the preferred specific embodiment of the present application, but the protection scope of the present application is not limited thereto, and any changes or replacements easily thought of by those skilled in the art within the technical scope disclosed by the present application should be covered within the protection scope of the present application.

Claims

1. A rotational self-centering frictional slip joint, characterized by: The node comprises two groups of relatively slidable friction plates, a combined disc spring (3) and a high-strength bolt (2); the two groups of relatively slidable friction plates are buckled together and are connected in series on the high-strength bolt (2); the outer side of the friction plate on the high-strength bolt (2) is additionally tightly sleeved with the combined disc spring (3) to apply pre-tightening force to the friction plate; the outer end of the combined disc spring (3) is fixed or tightly pressed on the outer side of the high-strength bolt (2); Each group of the friction plates comprises an outer friction plate (1a) and an inner friction plate (1b), and the two inner friction plates (1b) are buckled together; each inner friction plate (1b) is provided with a plurality of fan-shaped serrated protrusions (4) on the inner side; the fan-shaped serrated protrusions (4) on the two inner friction plates (1b) are oppositely staggered and rotatable. The outer friction plate (1a) is arranged on the outer side of the inner friction plate (1b), and the inner side of the outer friction plate (1a) and the outer side of the inner friction plate (1b) are provided with wedge-shaped protrusions (5); the wedge-shaped protrusions (5) on the outer friction plate (1a) and the wedge-shaped protrusions (5) on the inner friction plate (1b) are oppositely staggered and integrated, thereby being spliced into a cylindrical friction plate.

2. A rotational self-centering frictional slip joint according to claim 1, characterized in that: The outer side of the outer friction plate (1a) is connected with an external structure through a connecting rod, so as to drive the two groups of friction plates to rotate relatively.

3. The rotary self-resetting friction sliding node according to claim 2, characterized in that: In the initial state without external load, the wedge-shaped protrusions (5) on the outer friction plate (1a) and the wedge-shaped protrusions (5) on the inner friction plate (1b) are oppositely staggered and integrated; When a small rotation angle is generated under external load, the two inner friction plates (1b) rotate relatively; when the fan-shaped serrated protrusions (4) on the inner friction plates are in contact, the two inner friction plates (1b) stop rotating and are locked, the energy is consumed through sliding friction, but there is no self-resetting function, and the hysteresis curve is shuttle-shaped; When a large deformation is generated under external load, the two inner friction plates (1b) first rotate until being locked under small deformation, and then the outer friction plate (1a) and the inner friction plate (1b) start to rotate relatively as the rotation angle increases; During the rotation process, the wedge-shaped protrusions (5) generate oblique sliding and axial displacement, so that the outer friction plate (1a) and the inner friction plate (1b) are gradually opened, the outer friction plate (1a) is offset outward and compresses the combined disc spring (3), the energy is consumed through sliding friction, the self-resetting function of the elastic component is realized through the combined disc spring (3), the hysteresis curve changes from shuttle-shaped to flag-shaped, and the variable hysteresis performance is realized.

4. A rotary self-centering frictional sliding joint according to claim 1, characterized in that: The pre-tightening force of the combined disc spring (3), the wedge-shaped height of the wedge-shaped protrusions (5) and the wedge angle of the wedge-shaped protrusions (5) determine the opening and closing degree of the outer friction plate (1a) and the inner friction plate (1b).

5. A rotary self-centering frictional sliding joint according to claim 4, characterized in that: The stiffness of the combined disc spring (3) and the opening and closing degree of the outer friction plate (1a) and the inner friction plate (1b) determine the maximum rotation angle of the friction node.

6. A rotary self-centering frictional sliding joint according to claim 1, characterized in that: The outer friction plate (1a) and the inner friction plate (1b) are integrally turned by turning.

7. A rotary self-centering frictional sliding joint according to claim 1, characterized in that: The fan-shaped sawtooth-shaped protrusions (4) and wedge-shaped protrusions (5) are 3-6.

8. A rotary self-centering frictional sliding joint according to claim 7, characterized in that: The fan-shaped sawtooth-shaped protrusions (4) and wedge-shaped protrusions (5) are evenly distributed along the circumferences of the inner friction plate (1b) and the outer friction plate (1a).

9. Use of a rotational self-centering frictional sliding joint according to any of the claims 1-8, characterized in that: It is applied to the connection between the support member of the building structure and the bridge structure.

Images