大跨度箱型截面桥梁施工有限元模拟与分析

Finite Element Simulation and Analysis of Large Span Boxsection Bridge Construction

箱型截面因体积大,施工质量难于控制,内部常出现部分微裂缝现象。通过采用M idas软件对桥梁的施工阶段各种荷载组合工况进行分析,得到在各荷载组合工况下的承载能力包络图。分析表明,在不同荷载工况组合下,截面应力相差较大,上下边缘出现拉压互换,截面应力应作为施工监控重点,并提出应变监控的关键部位与方法及测量数据采集技巧。

It is difficult to control the construction quality because of Large volume and Often Appear micro cracks in the internal. A variety of loads in the Construction stage had been analysised by the use of Midas software and had Get the bearing capacity of envelope diagram under the condition of all the major load combination.analysis shows that section stress is larger difference in the combination of different load Conditions, and it appear swap both tension and compression stress on the Cross section of upper and lower edges, section stress is as emphasis for construction monitoring, and puts forward key parts of strain monitoringa, method, technique of measurement data acquisition.