悬索桥有限元建模及动力特性分析  

FE Modeling and Dynamic Response Analysis of a Suspension Bridge

作　　者：张卉[1] 王志清[1] 

机构地区：[1]华中科技大学土木工程与力学学院,湖北武汉430074

出　　处：《华中科技大学学报（城市科学版）》2006年第2期25-27,37,共4页Journal of Huazhong University of Science and Technology

基　　金：西部交通建设科技项目(200431800024)

摘　　要：以四渡河大跨悬索桥为工程背景,采用AN SY S建立3D有限元模型,针对缆索承重的特点,分析了主缆初始应变对平衡构型的影响、几何非线性因素对模型的作用以及桥的动力特性.在恒载作用下,主缆的初始应变对桥面变形影响很大.不经过恒载静力分析而进行模态分析将导致很大的误差;在恒载线性静力分析后进行模态计算,与恒载非线性静力计算后的模态结果差距较小;恒载静力分析中非线性因素大位移对模态影响甚微.Based on the suspension bridge of Sidu River, the process of how to develop a 3D model with ANSYS is described. According to the characteristics of bearing capability of cable, the suspension bridge equilibrium configuration with the main cable under different initial strains is analyzed, and the influence of geometric nonlinearity on the model is discussed. Finally the dynamic responses of the bridge are analyzed. The results show that the main cable initial strain has great influence on the deformation of the bridge deck. Without static analysis before the modal analysis of the suspension bridge, it may lead to a great error. The result of modal analysis following static linear analysis under dead load is similar to that following static nonlinear analysis, and geometric nonlinearity due to large displacement has little influence on modal frequencies.

关 键 词：大跨悬索桥 平衡构型 静力非线性 动力特性 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]