摘要
本文以某主跨为370m的全漂浮体系双塔斜拉桥为工程背景,基于实测动力特性修正后的斜拉桥非线性有限元模型,分析了斜拉桥在不同频谱效应地震波作用下的地震响应特性,研究表明:修正后的双塔双索面全漂浮体系混凝土斜拉桥有限元模型可以较为准确的模拟实际桥梁的动力特性;卓越周期较大的Chi-chi单向地震波能引起工程背景斜拉桥较大的位移响应,而卓越周期较小的Lander-amboy波会引起工程背景斜拉桥较大的加速度响应;行波效应对斜拉桥的影响因输入地震波频谱效应的不同而不同,输入地震波的视波速越大,斜拉桥的地震响应特性与一致激励地震波输入的情况越接近。
A floating system concrete cable - stayed bridge with double towers, which has 370m main span, is selected as the sample of the required engineering background. Based on the nonlinear finite element model with cable - stayed bridge which is updated, the seismic charaeleristies under seismic waves with different frequency spectrum are discussed. The results show that the finite element model of float- ing system concrete cable - stayed bridge with updating can simulate the dynamic characteristics of real bridge. The cable - stayed hridge might have Larger displacement response under Chi - chi wave with longer predominant period. The cable - stayed bridge might have larger acceleration response under Lander - amboy wave with shorter predominant period. The influences of the traveling wave effect on the seis- mic responses of the cable -stayed bridge with a single tower are different due to the different frequency spectral characteristics and wave velocities.
出处
《福建建设科技》
2016年第6期19-23,共5页
Fujian Construction Science & Technology
关键词
全漂浮体系混凝土斜拉桥
有限元模型修正
地震响应特性
行波效应
floaling system concrete cable -stayed bridge
finite element model updating
seismie characteristics
traveling wave.
