【摘要】 提出了一种考虑结构施工过程的有限元模型修正技术,把复杂工程结构按照施工过程分阶段进行测试、建模和模型修正,以减小修正过程的复杂程度,提高修正结果的准确性。以主跨1490m的润扬悬索桥为例,根据施工过程将该桥的整体有限元建模拆分为两阶段:裸塔阶段和成桥阶段。在此基础上应用基于灵敏度的物理意义以及一阶优化算法的模型修正技术,根据现场实测数据对两阶段有限元模型分别进行修正和验证,得到了能够较好地反映大桥实际状况的有限元基准模型。动静力实测结果均验证了该文多阶段有限元模型修正技术应用于大跨度悬索桥结构的有效性。研究结果为润扬悬索桥的结构健康监测提供了研究基础,同时可为其它大跨度缆索支撑桥梁结构的有限元模型修正提供参考。更多还原

【Abstract】 A model updating method considering the construction procedure is presented. In this method, in order to reduce the complexity of updating and increase the accuracy of calculation results, the test, FE modeling and model updating on complex engineering structures are conducted respectively according to the structural construction procedure. Runyang Suspension Bridge (RSB) with a main span of 1490m is taken as an example, and the FE modeling of RSB is divided into two phases of only-tower phase and whole-bridge phase according to the construction procedure. Based on the physical meaning of sensitivity and the first order optimization method, the FE models of the two phases are updated and validated by respectively using measurement data from the field test, and the FE baseline model reflecting the current state of RSB is achieved. Both the dynamic and static measurement results prove the efficiency of the multi-phase FE model updating method applied on long-span suspension bridges. The results obtained provide a research basis for structural health monitoring of the RSB and reference values for FE model updating of other long-span cable-supported bridges.更多还原