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首页> 外文期刊>Structural engineering international >Seismic Isolation of Bridges Using Variable Frequency and Variable Friction Pendulum Isolator System
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Seismic Isolation of Bridges Using Variable Frequency and Variable Friction Pendulum Isolator System

机译：变频变摩擦摆式隔振系统隔震

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摘要

Friction pendulum system (FPS) with spherical sliding surface is an effective isolation system for bridges subjected to earthquake ground motion. However, due to constant curvature, this sliding surface may encounter resonance problem at low frequency. In order to overcome this limitation, an isolation system with variable frequency and variable friction is proposed for bridges in this study. The isolator is similar to typical FPS, but the curvature of the sliding surface and the friction coefficient along the surface are varied and they become a function of sliding displacement. A three-span continuous bridge isolated with variable frequency and variable FPS is analysed to study the effectiveness of the proposed system. It is concluded from the study that the resonance problem due to low frequency ground motion can be prevented using the proposed isolator. The proposed isolator reduces the base shear considerably without increasing the residual displacements. Also, the proposed isolator has the advantages of both the FPS and the pure friction (PF) system.
机译：具有球形滑动面的摩擦摆系统（FPS）是一种有效的隔震系统，用于地震地震动的桥梁。但是，由于曲率恒定，该滑动表面可能会在低频下遇到共振问题。为了克服这一限制，本研究提出了一种具有可变频率和可变摩擦力的桥梁隔离系统。隔离器类似于典型的FPS，但滑动表面的曲率和沿表面的摩擦系数是变化的，它们成为滑动位移的函数。分析了一个三跨连续桥，该桥采用变频和可变FPS隔离，以研究所提出系统的有效性。从研究得出的结论是，使用所提出的隔离器可以防止由于低频地面运动而引起的共振问题。所提出的隔离器在不增加残余位移的情况下大大降低了基础剪力。而且，提出的隔离器具有FPS和纯摩擦（PF）系统的优点。

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