【摘要】 在役桥梁的安全评估和加固分析往往采用原始桥梁模型,存在局限性。该文在传统的基于最优化理论的结构参数估计技术的基础上结合实际桥梁工程检测经验发展了一种多阶段模型修正法,其中采用了三步参数化技术进行结构参数化,根据待修正参数对误差指数EI的敏感性将其分级,然后采用分阶段方法实现有限元模型修正。该文比较了不同修正参数集以及不同方法的模型修正效率和效果,并将修正后的有限元模型运用于在役桥梁承载性能分析,结果表明:多阶段模型修正法较直接修正法有较高的效率和较好的效果,修正后模型能实现在役桥梁较为详尽系统的安全评定。更多还原

【Abstract】 A baseline model is usually used in the safety appraisal and strengthening analysis of bridges on service,which is of defects.In this paper a multistage modal updating method,which caters to actual bridge inspecting experience,is presented based on traditional structural parameter estimation by optimization theory.Three-step parameterization is applied in it:parameters to be update are ranked according to their sensitivity to error index EI and the finite element model is updated stage by stage.The modal updating efficiency and effect are compared between different updating parameter ensembles and different updating methods and the updated finite element model is utilized in carrying capacity of bridge on service.The results show that multistage modal updating displays a higher efficiency and a better effect than straight modal updating and the updated model is able to realize systematically the specific safety appraisal of bridges on service.更多还原