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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。
The existing bridge models are often used in the safety assessment and reinforcement analysis of the existing bridges, which have limitations. Based on the traditional theory of structure parameter estimation based on optimization theory, this paper developed a multi-stage model correction method based on the actual experience of bridge engineering inspection. Three-step parametric technique was used to parameterize the structure. Based on the parameters to be corrected Sensitivity to the error index EI is graded, and then the finite element model is modified using a phased approach. This paper compares the efficiency and effect of model modification with different modified parameter sets and different methods. The modified finite element model is applied to the analysis of bearing capacity of existing bridges. The results show that the multi-stage model correction method is higher than the direct correction method Efficiency and good results, the revised model can achieve more detailed in-service bridge system safety assessment.