虚拟激励法在自锚式悬索桥竖向地震反应分析中的应用  

Application of pseudo excitation method to vertical seismic response analysis of self-anchored suspension bridges

作　　者：刘春城[1] 张哲[1] 石磊[1] 

机构地区：[1]大连理工大学桥梁工程研究所,大连116023

出　　处：《东南大学学报（自然科学版）》2003年第4期522-525,共4页Journal of Southeast University：Natural Science Edition

摘　　要：考虑压、弯耦合效应 ,建立了自锚式悬索桥的竖向地震动方程 ,并利用虚拟激励法来求解 ,由于虚拟激励法自动计及了参振振型的互相关项和激励之间的互相关项 ,是快速精确的CQC算法 .文中以兰旗松花江混凝土自锚式悬索桥为例 ,计算了主梁、主塔和主缆的期望峰值响应 。The vertical seismic dynamic equation of self-anchored suspension bridges is presented by taking into account the coupling effect of axial and flexural action, and pseudo excitation method is utilized to solve this equation. Because the method is highly efficient and involves the necessary cross-correlation terms both between the participant modes and between the excitations, it is a fast and exact CQC (complete quadratic combination) algorithm. The expected peak responses of main beam, towers and cables of Lanqi Song Hua River concrete self-anchored suspension bridge are investigated, and the spatial variation effect on vertical seismic response of self-anchored suspension bridge are detailed.

关 键 词：虚拟激励 自锚式悬索桥 竖向地震反应 空间效应 压弯耦合 

分 类 号：U442.55[建筑科学—桥梁与隧道工程]