摘要
本文以某主跨为340m的半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,分析了工程背景斜拉桥的抗震性能及其减震措施。研究表明:修正后的半漂浮体系双塔斜拉桥有限元模型可以较为准确的模拟工程背景桥的实际状态;在卓越周期较大的Chi-chi地震波作用下,工程背景桥会产生较大的构件内力和梁端纵桥向位移,可能导致桥梁发生损伤。通过粘滞阻尼器参数分析可知,阻尼系数C=20000k N·s/m为该桥的最优阻尼系数,在塔梁连接处安装该纵桥向粘滞阻尼器后,工程背景斜拉桥的构件内力及梁端纵桥向位移明显减小,抗震效果显著。
A semi-floating system cable-stayed bridge with double towers,which has 340 m 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 modified by field dynamic characteristics testing data,the seismic capacity and damping method are discussed.The results show that the finite element model of semi-floating system cable-stayed bridge after modified can simulate the dynamic characteristics of real bridge.The cable-stayed bridge will be damage because it can has larger internal force of members and the longitudinal displacement of beam-end under Chi-chi wave with longer predominant period.The parameter analysis of viscous damper shows that damping coefficient at C=20000 kN·s/m is the optimal damping coefficient of the semi-floating system cable-stayed bridge of engineering background.The internal force of members and the longitudinal displacement of beam-end will be reduce if the longitudinal viscous damper is setting in the joint of tower and beam.It can also be concluded that the damper can effectively improve the seismic performance of the cable-stayed bridge of engineering background.
出处
《福建建设科技》
2017年第1期20-23,27,共5页
Fujian Construction Science & Technology
关键词
半漂浮体系斜拉桥
有限元模型修正
抗震性能
减震措施
粘滞阻尼器
semi-floating system cable-stayed bridge
modified finite element model
seismic capacity
damping method
viscous damper
