多点激励下安装阻尼器对大跨度斜拉桥减震效果分析

Vibration reduction effect analysis of long-span cable-stayed bridges with viscous damper under multi-excitations

由于减震装置的非线性滞回特性、地震动的空间变异性,安装减震装置的斜拉桥结构地震响应分析是一典型的多输入非线性振动问题。为了研究非一致激励下大跨度减震斜拉桥抗震性能,建立了非一致激励下,减震桥梁结构的运动方程,并基于大质量法、Newton-Raphson法和Newmark-β法构造了其迭代求解格式。再以此算法为基础,以一已建成的采用阻尼器减震的斜拉桥为例,对比分析了设置/不设置阻尼器时其抗震性能。

Due to the nonlinear hysteresis characteristics of dampers and the spatial variability of ground motion,the seismic response analysis of bridges with dampers is a typical multi-input nonlinear vibration problem. In order to study the seismic performance of a long-span cable-stayed bridges with dampers under multi-excitations,the motion equations of a long-span cable-stayed bridges with dampers under multi-excitation is established,based on the large mass method,Newton-Raphson method and Newmark method, its iterative solution format is constructed. Using this algorithm,the seismic performance of the bridge with/without dampers is compared.