白石大桥栈桥结构设计与有限元仿真分析

On the Structural Design and a Finite Element Simulation Analysis of the Trestle Bridge for Baishi Bridge

针对白石大桥位于强风地区的工程实际,通过分析采用了风阻更小的工字钢作为栈桥主梁,并确定了栈桥具体的结构构造与组成。通过分析栈桥钢板、主梁以及横梁之间的接触关系,建立了与栈桥工作状态一致的有限元整体模型,并根据使用车辆荷载状况考虑了最不利的两种荷载组合加载状态,采用Midas软件建立有限元仿真分析模型,经计算表明,该栈桥主要上部结构满足强度、刚度要求。实际应用证明了栈桥结构具有足够的安全性。

In view of the fact that the Baishi Bridge is located in a strong-wind area and upon the basis of analyzing the actual engineering construction conditions,I-beams with less wind resistance are chosen as the main girder for the trestle bridge,with the specific structure and composition of the trestle bridge determined.Through analyzing the contact relations among the steel slabs,the main girder and the lateral beams,an integral finite element model consistent with the working state of the trestle is established in the present paper,and according to the load conditions of the automobiles,the most unfavorable loading situation where two loads in combination are exerted are taken into account.With the help of the software Midas,a finite element simulation analysis model is established for the simulation calculations,the result of which shows that the main upper structure of the trestle bridge can meet the requirements in both strength and stiffness,and the practical use of the trestle shows that it is sufficient in safety.