摘要
地震动的速度脉冲特性是加重工程结构在地震中的破坏程度的重要因素,速度脉冲已成为近断层地震动的重要工程特性之一.以一座大跨飘浮体系斜拉桥为例,选择了4组具有速度脉冲特性的实际地震动加速度记录及人工模拟的具有相同加速度反应谱而无速度脉冲的地震动时程分别作为地震动输入,利用三维有限元方法计算了地震动的速度脉冲对斜拉桥地震反应和减震控制反应,分析了地震动速度脉冲对斜拉桥地震反应和减震控制效果的影响特征.总体上看,斜拉桥在速度脉冲型地震动作用下的地震反应大部分要大于无速度脉冲型地震动的,近断层地震动的速度脉冲对斜拉桥无控制、半主动控制和被动控制地震反应均具有一定的不利影响,且地震动的速度脉冲对半主动控制和被动控制减震效果的影响趋势大体相同.
The velocity pulse of near-fault ground motions can aggravate the earthquake damage to engineering structures.The velocity pulse is regarded as one of the important engineering characteristics of near-fault ground motions affecting the earthquake damages to engineering structures.The seismic responses and structural control effects were simulated by three dimensional finite element model for long-span floating cable-stayed bridges with and without the vibration control system,in which four strong motion records with velocity pulse and corresponding synthetic time histories with same response spectra and without velocity pulse were used as ground motion inputs.The characteristics of velocity pulse influence were discussed respectively on seismic responses of long-span floating cable-stayed bridges with and without the vibration control system.The study shows that seismic responses of cable-stayed bridge to ground motions with velocity pulse are greater than those to ground motions without velocity pulse,and ground motions with velocity pulse can make strong disadvantageous influence on seismic responses of bridges with un-control,semi-active control and passive control systems,and the influence is almost same on responses of bridges with semi-active control and passive control systems.
出处
《应用基础与工程科学学报》
EI
CSCD
北大核心
2012年第2期272-285,共14页
Journal of Basic Science and Engineering
基金
国家重点基础研究发展计划(2011CB013601)
国家自然科学基金重大研究计划项目(90715038
91015001)
关键词
斜拉桥
强震动记录
速度脉冲
半主动控制
被动控制
cable-stayed bridge
strong motion
velocity pulse
semi-active control
passive control
