摘要
根据同一加速度反应谱拟合了加速度峰值相同、速度峰值相同、位移峰值不同的两组地震动时程。以大跨斜拉桥的三维模型为例,在以上两组时程的激励下,应用有限元方法,对斜拉桥的地震反应进行了分析。计算结果表明:在弹性阶段,地震动位移峰值对斜拉桥的动力响应影响不明显;但当结构进入弹塑性阶段时,在位移峰值较大的一组地震动激励下,桥梁的墩底弯矩和塔顶位移会有更大的响应。
Two groups of seismic ground acceleration histories are synthesized to match the same acceleration response spectrum. Those two groups have the same peak value in acceleration and velocity, while it is different in displacement. A three-dimension large span cable-stayed bridge model is utilized to illustrate the different seismic responses of structure excited by the acceleration histories mentioned above. Applying the finite element analysis method, we find that there is barely difference in the responses of structure between the two groups of responses in the elastic stage, but in the inelastic stage the acceleration time histories which have greater displacement peak value will cause larger values of the moments at the pier bottom and the displacements at tower top than those which have less one.
出处
《中国地震》
CSCD
北大核心
2006年第4期418-424,共7页
Earthquake Research in China
基金
国家自然科学基金资助项目(项目编号:50278090)
关键词
地震动
反应谱
斜拉桥
地震反应
位移峰值
Ground motion Acceleration response spectrum Cable-stayed bridge Seismic response Peak displacement of time history
