澧水河大桥施工猫道的非线性静风响应分析  

Analysis of Nonlinear Aerostatic Response for Catwalk of Lishui Suspension Bridge

作　　者：李宇[1] 刘博 李加武[1] 白桦[1] 

机构地区：[1]长安大学旧桥检测与加固技术交通行业重点实验室,陕西西安710064 [2]陕西省建筑材料工业设计研究院,陕西西安710032

出　　处：《建筑科学与工程学报》2013年第1期60-65,共6页Journal of Architecture and Civil Engineering

基　　金：国家自然科学基金项目(51078038;51208337;90915001);天津市城乡建设和交通委员会项目(2012-软8);中国博士后科学基金项目(2011M501429)

摘　　要：基于澧水河悬索桥施工猫道节段模型的静力三分力风洞试验,考虑猫道的几何非线性和静风荷载的非线性,采用增量与内外两重迭代相结合的方法,利用ANSYS参数化设计语言APDL编制了能够精确求解悬索桥施工猫道非线性静风响应的程序。在此基础上,建立了澧水河大桥猫道的有限元模型,进而对其进行了三维非线性静风稳定性分析,并计算了不同风速下的澧水河大桥猫道不同桥轴线位置处的静风响应。结果表明:猫道发生静力扭转失稳的原因是空气力矩的作用使猫道面层处于正攻角;最大扭转变形则发生在跨中2个横向通道之间,是猫道各组成部分中最容易发生静风失稳的构件。Based on the wind tunnel experiment for aerostatic force of section model of catwalk of Lishui suspension bridge, one calculation program considering geometric nonlinearity and aerostatic nonlinearity was prepared by using ANSYS parametric design language APDL in order to calculate nonlinear aerostatic response for catwalk. Then, the finite element analysis model of catwalk of Lishui suspension bridge was established to analyze three-dimensional nonlinear aerostatic stability. Meanwhile, the aerostatic response with different velocities of catwalk of Lishui suspension bridge was also calculated. The results indicate that air torque make catwalk surface to be attack angle which cause the nonlinear aerostatic instability of catwalk. The maximum torsion deformation happen in the middle of two horizontal channel in the mid-span of catwalk. So this component of catwalk should be improved.

关 键 词：悬索桥 静风响应 变形 非线性分析 猫道 

分 类 号：U448.25[建筑科学—桥梁与隧道工程]