移动荷载作用下桁架桥动力响应的数值分析  

Numerical analysis for dynamic response of truss bridge under moving loads

作　　者：汪小超[1] 刘鹏[2] 

机构地区：[1]浙江工业大学浙西分校,浙江衢州324000 [2]湖南省高速公路管理局,湖南长沙410001

出　　处：《浙江工业大学学报》2010年第3期338-340,共3页Journal of Zhejiang University of Technology

基　　金：浙江省自然科学基金资助项目(Y605040)

摘　　要：为研究移动荷载作用下桁架桥的振动情况,采用有限元方法,编制了桁架桥有限元计算程序,分析了节点静力荷载和移动荷载两种工况作用下某工程中三联钢桁架桥的受力情况,计算了静力荷载作用下的节点位移和单元内力,模拟了移动荷载作用下桁架桥动力响应过程,并与MIDAS/Civil程序计算结果进行比较.计算结果表明,两种方法对静力问题求解是吻合的;在动力分析时,相对于MIDAS程序中施加的"跳跃"性节点动力荷载,所给的线性插值分配方案,使得移动荷载具有较好的连续移动性,其动力响应曲线相对缓和.For the sake of studying the vibration of truss bridge under moving loads, Finite Element Method is adopted and an FEM calculation program of truss bridge is worked out. The force condition of continuous steel truss bridge in a project under node static loads and moving loads is analyzed. Node displacement and element force of the truss bridge under the node static load are calculated, and a full dynamic response process of the truss bridge subjected to a moving load is simulated numerically. Finally, the calculation results have been compared with MIDAS/ Civil program method. The results show that it can get the same calculation results with two methods for static problem. In process of dynamic analysis, comparing to the jumping node dynamic loads applied by MIDAS program, a distribution scheme of linear interpolation for moving loads is adopted. It has good continuous mobility for moving loads, and the curves of dynamic response are lenitive correspondingly.

关 键 词：桁架桥 振动 移动荷载 动力响应 数值模拟 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]