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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。
A finite element model modification technique considering the construction process of the structure is proposed. The complex engineering structure is tested, modeled and modified in stages according to the construction process so as to reduce the complexity of the correction process and improve the accuracy of the correction result. Taking the Runyang Suspension Bridge with the main span of 1490m as an example, the overall finite element modeling of the bridge is split into two stages according to the construction process: naked tower stage and bridging stage. On this basis, the physical meaning based on sensitivity and the model modification technique based on the first-order optimization algorithm are applied to correct and verify the two-stage finite element model according to the field measurement data respectively. The finite element criterion that can reflect the actual condition of the bridge well is obtained model. The results of the static and dynamic tests verify the validity of the proposed multi-stage finite element model correction technique applied to the long-span suspension bridge structure. The research results provide the foundation for the structural health monitoring of Runyang Suspension Bridge and provide a reference for the revision of the finite element model of other long-span cable-stayed bridge structures.