双曲面摩擦摆减隔震支座参数的地震响应分析

Seismic Response Analysis of Parameters of Hyperbolic Friction Pendulum Isolation Bearing

双曲面摩擦摆隔震支座在减隔震设计中应用较为广泛.为研究双曲面摩擦摆支座对桥梁的隔震响应效果,以在建某大跨连续梁桥为实例,采用MIDAS软件建立全桥模型,通过非线性时程分析方法,研究了双曲面摩擦摆支座的摩擦系数、曲率半径等因素对连续梁桥地震响应的影响.结果表明:双曲面摩擦摆支座能有效地降低桥梁墩身结构的地震响应,避免墩身塑性损伤,满足减隔震设计要求.另外,墩底最大纵横向弯矩、支座处最大纵横向相对位移会随着摩擦摆的摩擦系数和支座半径的变化均呈现出一定的规律性.实际工程中应优化比较,确定最优的摩擦摆支座摩擦系数和曲率半径.

The friction pendulum isolation bearing is widely used in the design of seismic absorption and isolation.In order to study the isolation effect of the friction pendulum bearing on the bridge,the full bridge model was established by MIDAS software with the example of a full-span continuous beam bridge.The influence was studied by nonlinear time history analysis method on the seismic response of continuous beam bridges in the aspects of the friction coefficient and radius of curvature.The results showed that the hyperbolic friction pendulum could effectively reduce the seismic response of the pier structure of the bridge,avoid plastic damage of the pier body,and meet the design requirements of seismic absorption and isolation.In addition,the maximum longitudinal and transverse bending moment at the bottom of the pier and the maximum vertical and horizontal relative displacement of the bearing would show a certain regularity with the friction coefficient of the friction pendulum and the radius of the bearing.In actual engineering,the comparison should be optimized to determine the optimal friction coefficient and radius of curvature of the friction pendulum bearing.