大跨度桥梁模型修正方法研究

提出一种通用有限元程序和数学软件相结合的大跨度桥梁有限元模型修正方法.根据摄动理论,将原优化问题转化为求解一系列灵敏度不变的优化子问题,从而方便简单地实现大跨度桥梁的模型修正.数值模拟及采用静、动态实测数据对石板坡长江大桥复线桥进行模型修正的结果表明,该方法不但具有可行性,还能大大降低计算工作量,修正后的模型可以作为后续计算的基准模型.

Research of Model Modification Method for Long Span Bridge

A modification method based on the combined universal finite element program and mathematic software for finite element model of long span bridge is proposed. In compliance with the perturbation theory, the original optimization problem of model modification is converted into the solution of a series of optimization subproblems with their sensitivity not changed and the model modification for long span bridge can be therefore easily and simply implemented. The results of the numerical simulation and model modification for the Double-Line Bridge of Shibanpo Changjiang River Bridge by the static and dynamic field measurement data show that the method as presented in the paper is not only feasible, but also can greatly reduce the calculation work, and the modified model can be used as a baseline model for successive calculation of the Bridge.