既有钢筋混凝土双曲拱桥承载能力评估

钢筋混凝土双曲拱桥主要建造于20世纪60年代末和70年代初,由于当初建造时荷载标准较低,再加上多年超载运营,桥梁损伤严重,承载能力下降,对交通运输安全构成严重威胁.依据实桥荷载试验所得的力学特性参数,首先采用基于敏感性分析的参数修正法修正计算模型,并对该计算模型进行验证.然后利用验证后的计算模型和承载能力系数法对桥梁结构的承载能力进行评估.最后通过对一实际既有钢筋混凝土双曲拱桥承载能力的评估分析结果可以看出:本文所述方法对于既有双曲拱桥承载能力的评估具有良好的效果.

Evaluation of Load-carrying Capacity for Existing Double-curved Arch Bridge

Concrete double-curved arch bridge was mainly built in the late 1960s and early 1970s.Because of lower load standard and overload operating,the bridge damaged severely,the bearing capacity declined so that traffic safety was threatened severely.In this paper,sensitivity analysis of parameter modification method is played in updating finite element model based on bridge loading test data,and the model is certificated firstly.The bridge bearing capacity is evaluated by using validated model and bearing capacity factor method.Finally,the analysis of one existing double-curved arch bridge bearing capacity indicates that bearing capacity factor method has good effect on the existing double-curved arch bridge bearing capacity.