正交异性板桥面体系多尺度动态边界逼近方法  

Multi-Scale Dynamic Boundary Approximation Method for Orthotropic Plate Bridge Decking

作　　者：田园[1] 张楠[1] 夏禾[1] 

机构地区：[1]北京交通大学土木建筑工程学院,北京100044

出　　处：《桥梁建设》2015年第4期100-106,共7页Bridge Construction

基　　金：中央高校基本科研业务费专项资金项目(2014YJS096);国家重点基础研究发展计划973项目(2013CB036203);高等学校博士学科点专项科研基金资助项目(20130009110036)~~

摘　　要：针对采用传统方法求解大跨度铁路钢桥中正交异性板桥面体系的动力效应的缺陷,提出一种基于动力平衡方程和有限元思想的多尺度动态边界逼近分析方法。首先在较大尺度上建立整体节段模型,验证模型正确性并完成动力计算。然后在整体模型的基础上对所关心的局部区域进行精细化处理。根据有限元对应关系,利用前一步计算所得整体模型的响应作为细化模型的边界条件,最终得到小尺度模型的动力响应。以某公铁两用斜拉桥铁路正交异性板钢桥面体系为例,通过与ANSYS计算结果进行对比验证了该方法的正确性及其精度,该方法既能够在较大尺度上完成整体分析,又能从细微角度逐步细化获取局部细节信息,具有很好的应用前景。In view of the deficiency of solving the dynamic effect of the orthotropic plate bridge decking of long span railway steel bridge, using the conventional method, a kind of the multi-scale dynamic boundary approximation method based on the dynamic balance equation and finite element idea was proposed. The global sectional model of the bridge decking was firstly established on a large scale, the correctness of the model was verified and the dynamic calculation of the model was made. On the basis of the global sectional model, the local areas of concern were refined and according to the corresponding relations of the finite elements, the responses of the model obtained from the previous step calculation were then taken as the boundary conditions of the refined model and the dynamic responses of the small-scale model were finally obtained. By way of example of the railway orthotropic plate steel decking of a rail-cum-road cable-stayed bridge, the correctness and accuracy of the proposed method were verified by comparison of the method to the calculation results of the ANSYS. The method not only can fulfill the global analysis of the large-scale model, but also can obtain the local detail information through gradually detailing from the minor detail angle and the method has very good perspective of application.

关 键 词：铁路桥 正交异性板桥面体系 多尺度建模 动态边界逼近 动力效应 有限元法 

分 类 号：U448.13[建筑科学—桥梁与隧道工程] U443.32[交通运输工程—道路与铁道工程]