基于MIDAS的钢桁梁检测静载轮位模型优化

Steel Truss Girder Detection Based on MIDAS Static Load Wheel Model Optimization

铁路钢桁梁桥静载试验中,利用Midas建立仿真模型,并提取杆件的最不利荷载轮位及其影响线,在这一过程中,发现最不利荷载轮位中所有试验编组的集中荷载均未通过桁梁节点的问题,通过分析其问题原因,优化Midas模型,解决了静载试验加载轮位错误的问题,提取出合理影响线,通过现场测试对比实测值与理论值,验证结果良好。

In the railway steel truss static load test, the simulation model which is based on MIDAS, it can extract the unfavorable load wheel and influence line of the bar. In this process, we found that all concentrated loads organized in testing have not pass the truss nodes in unfavorable load wheel. This paper via analysing the reason, optimizing the M IDAS model, solves the static load test wheel loading problem, giving a reasonable affecting line. Compared the test value with theoretical value by field test, a satisfying result is verified.