CN115652777A - An adaptive eddy current damping conical friction pendulum support and its installation method and application - Google Patents

Abstract

The invention discloses a self-adaptive eddy current damping conical friction pendulum support and an installation method and application thereof, wherein the pendulum support comprises a support top plate and a support bottom plate which are oppositely arranged up and down, a slide block is hinged at the center of the bottom of the support top plate, a conductor plate is fixedly connected with the outside of the slide block along the circumferential direction, a permanent magnet group is embedded in the bottom of the conductor plate, and a friction plate is arranged at the bottom of the slide block; a sliding surface for sliding the sliding block is arranged on the support base plate, and a copper plate which is attached to the sliding surface in shape is arranged on the sliding surface; the sliding surface comprises a flat sliding surface positioned at the central position, a variable curvature sliding surface positioned on the outer ring of the flat sliding surface and arranged tangentially with the flat sliding surface, and a slope sliding surface positioned on the outer ring of the variable curvature sliding surface and arranged tangentially with the flat sliding surface. According to the invention, by utilizing the eddy current damping energy consumption mode, a damping energy consumption mechanism is improved, and the self-adaptive adjustment of the damping energy consumption of the support can be realized under different seismic intensities.

Description

An adaptive eddy current damping conical friction pendulum support and its installation method and application

technical field

The invention belongs to the technical field of shock isolation (vibration) and shock absorption (vibration) control of civil engineering structures, and is used for anti-seismic of civil engineering structures such as buildings and bridges. Specifically, it relates to an adaptive electric eddy current damping conical friction pendulum support and an installation method and application thereof.

Background technique

The seismic performance of bridges is related to the safety of people's lives and property as well as the stable and healthy development of the economy and society. Therefore, the study of high-performance structural shock absorption measures with good environmental adaptability and seismic toughness is the key to improving the seismic performance of structures.

As an important force-transmitting component connecting the superstructure and substructure of the bridge, the bearing plays a key role in the force-transmission of the bridge. On the one hand, the superstructure of the bridge transmits the load to the substructure through the bearings; on the other hand, the bridge realizes the temperature-induced deformation of the superstructure through the bearings. Therefore, in order to improve the seismic performance of the bridge, the bearing must have a high degree of stability and a reliable force transmission method. There are a large number of engineering application examples in my country in terms of using bearings to realize the isolation (vibration) and damping (vibration) control of bridges. For example, the Nanjing Jiajiang Bridge uses E-shaped steel damping bearings, and the Quanzhou Jinjiang Bridge uses lead-core rubber Bearings, the Jingyue Yangtze River Bridge between the two lakes adopts friction pendulum bearings, etc.

Among various shock-absorbing and isolation (vibration) bearings, friction pendulum bearings are widely used in the seismic design of bridge structures due to their high bearing capacity, good seismic isolation effect, and high energy consumption. However, existing studies have shown that traditional friction pendulum bearings only dissipate seismic energy through friction, and the energy dissipation method is single. Resonance may occur under long-period earthquakes, and the frictional damping of bearings is overly dependent on friction materials. Environmental adaptability, Poor durability. In some girder bridges built in the early days of our country, the traditional friction pendulum bearings deteriorated due to serious wear and tear, and even led to bridge collapse in severe cases. Therefore, it is necessary to improve the energy dissipation mechanism of the traditional friction pendulum bearing.

Among the existing damping energy dissipation technologies, the eddy current damping energy dissipation technology has the advantages of no wear, long life, green energy dissipation mechanism and adjustable damping due to the non-contact energy dissipation method, and has become an important component in the seismic design of structures. One of damping energy consumption technologies. The specific working principle of the eddy current damping energy dissipation technology is: based on the preset magnetic field in the damper, the eddy current is generated by cutting the magnetic induction line through the conductor, and the vibration energy is converted into heat energy and transmitted to other media to dissipate the energy .

Therefore, the application of eddy current damping energy dissipation technology and variable curvature isolation technology to friction pendulum bearings is an effective way to solve the problem of poor durability of traditional friction pendulum bearings, prolong the service life of bearings, and improve their environmental adaptability and seismic toughness. measure.

Contents of the invention

Purpose of the invention: In order to solve the shortcomings of traditional friction pendulum bearings such as difficulty in realizing adaptive adjustment of horizontal stiffness, poor adaptive isolation ability, strong material dependence, short life cycle, and high maintenance cost. The invention provides an adaptive eddy current damping conical friction pendulum support and its installation method and application. The invention uses the eddy current damping energy consumption mode to improve the damping energy consumption mechanism, and the support damping can be realized under different earthquake intensities Adaptive regulation of energy consumption. The flat sliding surface, variable curvature sliding surface, and slope sliding surface work together to make the bearing have a wide frequency application range, which not only improves the environmental adaptability of the bridge under normal service conditions, but also realizes the bridge's ability to withstand strong earthquakes and giant earthquakes. Adaptive vibration isolation.

Technical scheme: in order to achieve the above object, the technical scheme of the present invention is as follows:

The present invention firstly provides an adaptive electric eddy current damping tapered friction pendulum support, which includes a support top plate and a support bottom plate arranged up and down oppositely, the bottom center of the support top plate is hinged with a slider, and the outer edge of the slider The conductor plate is fixedly connected in a circular direction, the bottom of the conductor plate is embedded with a permanent magnet group, and the bottom of the slider has a friction plate; the bottom plate of the support is provided with a sliding surface for the sliding of the slider, and the sliding surface A copper plate that conforms to its shape is provided; the sliding surface includes a flat sliding surface located at the center, a variable curvature sliding surface located tangent to the outer ring of the flat sliding surface, and a sliding surface located on the outer ring of the variable curvature sliding surface. A slope sliding surface arranged tangentially; the curvature radius of the variable curvature sliding surface gradually decreases from the center of the support to the outer periphery of the support.

Further, the permanent magnet set includes two rings of permanent magnet blocks arranged annularly on the periphery of the slider, and the magnetic poles of the two rings of permanent magnet blocks are opposite.

Further, a limiting ring is provided on the outer periphery of the sliding surface.

Further, the radius of curvature of the sliding surface with variable curvature is between 1m and 9m.

Further, a dust-proof pad is arranged circumferentially between the bottom plate of the support and the top plate of the support, and the dust-proof pad is made of viscoelastic material.

Further, a shock-absorbing pad is provided between the support top plate and the slider.

Further, the bottom plate of the support and the top plate of the support are respectively provided with bolt holes for connecting with the bridge.

The present invention also provides a method for installing the self-adaptive eddy current damping tapered friction pendulum support, the method includes the following steps:

(1) Fix the copper plate on the sliding surface of the support bottom plate, and then fix the support bottom plate with the copper plate on the surface to the lower main structure of the bridge with bolts;

(2) Fix the bottom of the slider to the friction plate, and install a conductor plate embedded with a permanent magnet block on the outer periphery of the slider, and then set a shock absorber at the center of the lower part of the top plate of the support, and then place the slider on the support At the center of the bottom of the bottom plate, a dust-proof pad made of viscoelastic material is arranged circumferentially between the top plate of the support and the bottom plate of the support;

(3) Center the top plate of the support installed in step (2) on the bottom plate of the support installed in step (1), so that the slider is at the center of the sliding surface of the flat plate;

(4) Finally, the top plate of the support and the upper main structure of the bridge are fixedly connected by bolts.

The self-adaptive electric eddy current damping conical friction pendulum bearing of the present invention is used as a force transmission part connecting the upper main body structure and the lower main body structure of the bridge. The resulting deformation; when subjected to the fortification earthquake, the slider moves along the sliding surface of the flat plate to the sliding surface with variable curvature tangent to it, avoiding the resonance caused by the frequency of the input load being close to the natural frequency of the structure, and reducing the dynamic response of the bridge; When subjected to strong earthquakes and giant earthquakes, the slider leaves the sliding surface with variable curvature and enters the sliding surface of the slope. At this time, the horizontal stiffness of the support is zero, which fundamentally solves the resonance problem; at the same time, the permanent magnet group forms a local magnetic field. During the movement of the block relative to the copper plate, the eddy current damping is generated in the copper plate by cutting the local magnetic field. The damping size is positively correlated with the speed, and the kinetic energy is converted into heat energy for dissipation, realizing frictional damping compound eddy current damping.

Beneficial effect:

1. The present invention designs an adaptive eddy current damping conical friction pendulum support. Compared with the traditional friction pendulum support, this support improves the shock absorption effect of friction damping through multi-stage sliding surfaces. The flat sliding surface R1, the variable curvature sliding surface R2 (the radius of curvature is between 1m and 9m), and the slope sliding surface R3 are set to work together, and the flat sliding surface is used to coordinate the operating load and temperature-induced deformation under normal working conditions to effectively avoid The bridge deck is lifted to improve the environmental adaptability of the bridge; the stiffness of the isolation system is adaptively controlled by variable curvature sliding surfaces and slope sliding surfaces to avoid resonance of the bridge, realize adaptive isolation of the bridge, and improve the seismic toughness of the bridge. Unlike the traditional constant curvature sliding surface, which has limited ability to deal with earthquakes, the slope sliding surface R3 fundamentally solves the problem of resonance due to its zero-frequency characteristics, and significantly improves the bridge's ability to deal with strong and giant earthquakes.

2. The present invention designs an adaptive eddy current damping tapered friction pendulum support. Compared with the traditional friction pendulum support, this support utilizes eddy current damping to coordinate energy consumption, and achieves shock resistance through the speed-dependent characteristics of eddy current damping The adaptive adjustment of the bearing enriches the energy consumption mechanism of the support and improves the energy consumption efficiency. Due to the advantages of eddy current damping and non-contact energy consumption, the loss of the support is effectively reduced, and the self-adaptive anti-seismic ability and durability of the support Improved.

3. Compared with the traditional support, the present invention has significantly improved performance efficiency, self-adaptive anti-seismic ability, self-adaptive adjustment ability and environmental adaptability, and significantly improved durability.

Description of drawings

Fig. 1 is the sectional view of this a kind of self-adaptive electric eddy current damping conical friction pendulum support;

Fig. 2 is the sectional view of A-A among Fig. 1;

Fig. 3 is a top view of the support base plate in Fig. 1;

Fig. 4 is a plan view of the top plate of the support in Fig. 1 .

Reference signs in the figure: support top plate 1, inner sliding cavity 2, support bottom plate 3, copper plate 4, permanent magnet 5, conductor plate 6, shock absorbing pad 7, slider 8, friction plate 9, dustproof pad 10, 11 bolt holes.

Detailed ways

As shown in Figure 1, the self-adaptive eddy current damping tapered friction pendulum support of this embodiment includes a support top plate 1 and a support bottom plate 3 that are arranged up and down oppositely, and the bottom center of the support top plate 1 is hinged with a slider 8. The outer edge of the slider 8 is fixedly connected to the conductor plate 6, the bottom of the conductor plate 6 is embedded with a permanent magnet group 5, and the bottom 8 of the slider has a friction plate 9; There is a sliding surface for the slider to slide, the sliding surface is provided with a copper plate 4 conforming to its shape; the sliding surface includes a flat sliding surface R1 at the center, a flat sliding surface R1 located on the outer ring of the flat sliding surface R1 The variable curvature sliding surface R2 arranged tangent thereto and the slope sliding surface R3 located tangentially arranged on the outer ring of the variable curvature sliding surface R2. The support top plate 1 is hinged with the slider 8, and an inner sliding cavity 2 is left to ensure that the slider 8 can rotate freely. The shock absorbing pad 7 coordinates the vertical micro-deformation and dissipates the energy of longitudinal vibration; the friction plate 9 is made of high damping viscose Elastic material, when an earthquake occurs, the friction plate 9 and the support bottom plate 3 will move relative to each other to dissipate frictional energy; the copper plate 4 is arranged, and the two ends of the sliding surface of the support bottom plate 3 are provided with limit structures to ensure that the slider is in normal working condition Without breaking away from the support, a dust-proof pad 10 is arranged circumferentially between the support bottom plate 3 and the support top plate 1, using viscoelastic materials that allow vertical and horizontal deformation, to isolate dust, water and other impurities, and to keep the surface of the copper plate 4 clean; bolt holes 11 is arranged on the four corners of the support bottom plate and the support top plate, and is used as a fixed support.

As shown in FIG. 2 , the permanent magnet group includes two rings of permanent magnet blocks arranged in a ring around the periphery of the slider. The magnetic poles of the two rings of permanent magnet blocks are opposite to form a local magnetic field. When the slider 8 slides relative to the support bottom plate 3, the copper plate 4 cuts the magnetic induction line in the local magnetic field generated by the permanent magnet 5, which realizes eddy current damping energy consumption, improves energy consumption efficiency, and prolongs the life cycle of the support.

As shown in FIG. 1 and FIG. 3 , a limit ring is arranged on the outer periphery of the sliding surface to ensure that the slider 8 is in a normal working position and prevent the slider 8 from detaching from the bottom plate 3 of the support.

In this embodiment, the radius of curvature of the sliding surface with variable curvature is between 1m and 9m. It is mainly used to adjust the natural frequency adaptively with the earthquake intensity to avoid resonance and ensure structural safety; the length of R1, R2, and R3 can be designed according to the structure or bridge conditions to achieve multi-level seismic requirements.

The present invention also provides a method for installing the self-adaptive eddy current damping tapered friction pendulum support, the method includes the following steps:

(1) Fix the copper plate on the sliding surface of the support bottom plate, and then fix the support bottom plate with the copper plate on the surface to the lower main structure of the bridge with bolts;

(2) Fix the bottom of the slider to the friction plate, and install a conductor plate embedded with a permanent magnet block on the outer periphery of the slider, and then set a shock absorber at the center of the lower part of the top plate of the support, and then place the slider on the support At the center of the bottom of the bottom plate, a dust-proof pad made of viscoelastic material is arranged circumferentially between the top plate of the support and the bottom plate of the support;

(3) Center the top plate of the support installed in step (2) on the bottom plate of the support installed in step (1), so that the slider is at the center of the sliding surface of the flat plate;

(4) Finally, the top plate of the support and the upper main structure of the bridge are fixedly connected by bolts.

The self-adaptive electric eddy current damping conical friction pendulum support of the present invention is used as a force transmission component connecting the upper main body structure and the lower main body structure of the bridge, and adopts a double energy consumption mechanism for energy dissipation and shock absorption. When the support bottom plate 3 and the bottom are provided with friction plates When the slider 8 of 9 slips relative to each other, the seismic energy is dissipated through strong friction; at the same time, the slider 8 with the permanent magnet 5 arranged in the circumferential direction moves relative to the copper plate 4, and eddy current damping is generated in the copper plate 4 by cutting the local magnetic field. Its damping size is positively correlated with speed, and has the advantages of adaptive damping adjustment and non-contact energy consumption. Both of them convert kinetic energy into thermal energy for dissipation, realizing efficient energy consumption of friction damping combined with eddy current damping.

When an adaptive eddy current damping tapered friction pendulum bearing is in normal use, that is, when the slider 8 is in the working state of the flat sliding surface R1, it mainly coordinates temperature-induced deformation and deformation due to operating loads to achieve environmental adaptation. sex. Under this working condition, the height of the bridge deck does not change, which does not affect the normal use of the bridge while ensuring the safety of the bridge girder.

When an adaptive eddy current damping tapered friction pendulum bearing is subjected to fortification earthquake, the displacement of the slider 8 increases significantly, and the slider 8 moves along the sliding surface R1 to the variable-curvature sliding surface R2 (the curvature of which is tangent to it) radius between 1m and 9m). The variable-curvature sliding surface R2 has a wide frequency range, which avoids resonance caused by the frequency of the input load being close to the natural frequency of the structure, thereby reducing the dynamic response of the bridge to achieve the goal of seismic performance. When subjected to rare earthquakes such as strong earthquakes and giant earthquakes, the displacement of the slider 8 further increases, leaving the variable curvature sliding surface R2 and entering the slope sliding surface R3, and the slider 8 moves from the variable curvature sliding surface R2 to the slope sliding surface R3, at this time, the horizontal stiffness of the support is zero, which fundamentally solves the resonance problem and effectively improves the adaptability of the structure to strong and giant earthquakes.

When the slider 8 moves to the edge of the slope sliding surface R3, in order to maintain the normal working performance of the support, a limit device is set at the edge of the sliding surface; in order to ensure that the eddy current damping achieves the best energy consumption state, the support A dustproof mat 10 is arranged to keep the surface of the copper plate 4 clean.

The self-adaptive electric eddy current damping conical friction pendulum bearing disclosed by the invention is suitable for vibration isolation (vibration) and vibration reduction (vibration) control of structures such as bridges, effectively multi-level fortification, and can cope with a certain degree of strong earthquakes and giant earthquakes and other extreme cases.

It should be noted that the above content only illustrates the technical idea of the present invention, and cannot limit the scope of protection of the present invention. For those of ordinary skill in the art, without departing from the principle of the present invention, they can also do Several improvements and modifications are made, and these improvements and modifications all fall within the protection scope of the claims of the present invention.

Claims (9)

1. A self-adaptive electric eddy current damping tapered friction pendulum bearing, is characterized in that, comprises the support top plate and the support base plate that are arranged up and down oppositely, the bottom center position of described support top plate is hinged slide block, and described slide block The outer ring is fixedly connected with the conductor plate, the bottom of the conductor plate is embedded with a permanent magnet group, the bottom of the slider has a friction plate; the bottom plate of the support is provided with a sliding surface for the slider to slide, and the sliding A copper plate conforming to its shape is provided on the surface; the sliding surface includes a flat sliding surface at the center, a variable curvature sliding surface located tangentially to the outer ring of the flat sliding surface, and an outer ring of the variable curvature sliding surface The slope sliding surface arranged tangent thereto; the curvature radius of the variable curvature sliding surface gradually decreases from the center of the support to the outer periphery of the support. 2. The self-adaptive eddy current damping tapered friction pendulum bearing according to claim 1, wherein the permanent magnet group comprises two rings of permanent magnet blocks arranged in the periphery of the slider along a ring, and the two rings of permanent magnets are arranged on the periphery of the slider. The magnetic poles of the magnet blocks are opposite. 3 . The self-adaptive eddy current damping conical friction pendulum support according to claim 1 , wherein a limiting ring is arranged on the outer periphery of the sliding surface. 4 . 4 . The self-adaptive eddy current damping conical friction pendulum support according to claim 1 , wherein the radius of curvature of the sliding surface with variable curvature ranges from 1 m to 9 m. 5. The self-adaptive eddy current damping tapered friction pendulum support according to claim 1, characterized in that, a dust-proof pad is arranged circumferentially between the bottom plate of the support and the top plate of the support, and the dust-proof pad adopts a viscoelastic Material. 6 . The self-adaptive eddy current damping tapered friction pendulum bearing according to claim 1 , wherein a shock absorbing pad is arranged between the bearing top plate and the slider. 7 . 7 . The self-adaptive eddy current damping conical friction pendulum support according to claim 1 , wherein bolt holes for connecting with bridges are respectively provided on the bottom plate of the support and the top plate of the support. 8. A method for installing the self-adaptive eddy current damping tapered friction pendulum bearing according to one of claims 1-7, characterized in that the method comprises the steps of: (1) Fix the copper plate on the sliding surface of the support bottom plate, and then fix the support bottom plate with the copper plate on the surface to the lower main structure of the bridge with bolts; (2) Fix the bottom of the slider to the friction plate, and install a conductor plate embedded with a permanent magnet block on the outer periphery of the slider, and then set a shock absorber at the center of the lower part of the top plate of the support, and then place the slider on the support At the center of the bottom of the bottom plate, a dust-proof pad made of viscoelastic material is arranged circumferentially between the top plate of the support and the bottom plate of the support; (3) Center the top plate of the support installed in step (2) on the bottom plate of the support installed in step (1), so that the slider is at the center of the sliding surface of the flat plate; (4) Finally, the top plate of the support and the upper main structure of the bridge are fixedly connected by bolts. 9. An application of the self-adaptive eddy current damping tapered friction pendulum support according to any one of claims 1-7, characterized in that the pendulum support is used as a force transmission component connecting the upper main body structure and the lower main body structure of the bridge , in the normal use state, the slider is on the sliding surface of the flat plate, coordinating the deformation caused by temperature and the deformation due to the operating load; when subjected to the fortification earthquake, the slider moves along the sliding surface of the flat plate to the sliding surface with variable curvature that is tangent to it , to avoid resonance caused by the frequency of the input load being close to the natural frequency of the structure, and reduce the dynamic response of the bridge; The stiffness is zero, which fundamentally solves the resonance problem; at the same time, the permanent magnet group forms a local magnetic field. During the movement of the slider relative to the copper plate, eddy current damping is generated in the copper plate by cutting the local magnetic field, and the damping magnitude is positive to the speed. Related, the kinetic energy is converted into heat energy dissipation, and the friction damping compound eddy current damping is realized.

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