针对大型预应力钢筋混凝土桥梁极限承载力问题，以辽阳市太子河中华大桥为背景，提出了基于模型修正理论的有限元数值模拟方法。大型钢筋混凝土结构桥梁，具有大跨度、多自由度、多单元、非线性等多重复杂特性，有限元软件建立的初始模型往往存在局限性。为使所建模型能够准确反映实体结构特性，在有限元模型修正理论的基础上，建立了综合考虑多因素的模型，对桥梁结构敏感细节进行了修正。对其进行了极限承载力分析计算。该成果对同类桥梁工程结构的承载力分析具有一定的参考价值和指导意义。%Regarding to the problem of large pre-stressed reinforced concrete structural bridges with structural damages , the finite element numerical analysis approach based on model updating was put forward .Large pre-stressed reinforced concrete structural bridges are complicated with long-span ,multiple free degrees ,multiple units and nonlinear character-istics ,etc .So that the initial models established with finite element software are always insufficient .In order to create an accurate model that would reflect the structural characteristics of the bridges ,finite element model updating theory was adopted to create a more suitable model with the consideration of the multiple factors .This new model revised the sensi-tive details of the structural design .Based on the study of Taizi River Zhonghua Bridge in Liaoyang ,the calculation and analysis of its ultimate bearing capacity was conducted using the updated model .This approach will provide some guid-ance and reference for analyzing ultimate bearing capacity of similar bridge structures .
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