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修正后的结构有限元模型是进行结构分析的基础。对于钢结构人行天桥,由于钢材加工批次的不同,选取待修正参数时先将人行天桥各部分分组进行灵敏度分析,然后以频率、NMD和模态柔度同数量级的和最小作为目标函数,利用ANSYS的优化模块对结构进行模型修正。仿真结果表明,修正后的有限元模型计算结果与模拟结果非常接近,可以用此方法建立基准有限元模型。
The revised structural finite element model is the basis for structural analysis. For the pedestrian bridge with steel structure, the sensitivity analysis of each part of the pedestrian bridge is firstly carried out when the parameter to be corrected is selected due to the difference of the batch of steel processing. Then, taking the frequency, NMD and modal compliance as the objective function, The ANSYS optimization module models the structure. The simulation results show that the calculated results of the modified finite element model are very close to the simulation results and the baseline finite element model can be established by this method.