Three-dimensional composite friction pendulum vibration isolator based on nonlinear energy trap

Abstract

The invention discloses a three-dimensional composite friction pendulum vibration isolator based on a nonlinear energy trap. Structural vibration frequency is staggered away from seismic oscillation dominant frequency and a large amount of seismic oscillation input energy is absorbed by using the characteristics of attenuation and absorption of vibration energy, absorption of vibration frequency bandwidth and the like existing in the nonlinear energy trap as well as a vertical vibration isolation disk-shaped spring, so that the multi-dimensional seismic response of a structure is reduced, and seismic hazards of building structures are prevented. The three-dimensional composite friction pendulum vibration isolator comprises a metal sliding sleeve, a disk-shaped spring, a polytetrafluoroethylene sliding joint, a nonlinear energy trap and pile caps, wherein the disk-shaped spring is arranged in the metal sliding sleeve; the polytetrafluoroethylene sliding joint is arranged on the disk-shaped spring; the polytetrafluoroethylene sliding joint is in relative sliding contact with an upper pile cap through a polytetrafluoroethylene coating; the side face of the nonlinear energy trap is connected with the disk-shaped spring through a rigid spring; the nonlinear energy trap is in rolling contact with a lower pile cap through a rolling shaft; sliding surfaces of the upper and lower pile caps are spherical surfaces. The three-dimensional composite friction pendulum vibration isolator is used for resisting possible violent earthquakes.

Description

Technical field: [0001] The invention relates to a three-dimensional composite friction pendulum shock isolator based on a nonlinear energy well, belonging to the field of shock isolation and shock absorption control. Background technique: [0002] It can be seen from the obtained seismic records that due to the difference in the mechanism of earthquake occurrence, the distance and the nature of the soil layer, each seismic record has its specific dominant frequency, that is, it has abundant energy at certain frequencies. Ordinary non-seismic-isolated multi-storey buildings have high stiffness and short period, and their basic period is just in the frequency band where the seismic input energy is the largest, so the corresponding acceleration response is much larger than the ground motion. If the frequency of structural motion is made to miss these energy-rich dominant frequencies, the seismic response of the structure can be reduced. Invention content: [0003] The objec...

AI Technical Summary

Problems solved by technology

A three-dimensional composite friction pendulum isolator based on a nonlinear energy well is proposed. The non-linear energy well, one of the frontier hotspots in the field of international vibration control in recent years, is applied to the improvement of the friction pendulum isolator. Novel features such as high-efficiency vibration absorption rate, wide vibration absorption frequency band, and the ability to transfer target energy can enable the friction pendulum isolator to achieve a good function of deformation and attenuation of seismic energy, while fully maintaining the characteristics of traditional isolation bearings, which can effectively solve the problem of Excessive Displacement of Seismic Isolation Floor and Problems of Seismic Isolation of Vertical Foundation

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