病害板肋石拱桥检测技术与剩余承载力评估

EXAMINATION TECHNIQUE AND EVALUATION OF BEARING CAPACITY FOR A DAMAGED RIBBED SLAB STONE ARCH BRIDGE

以祁东大桥——一座板肋石拱桥为工程背景,介绍了该桥现场病害检测技术。建立了考虑损伤和不考虑损伤的2个有限元模型进行桥梁剩余承载力理论估算,并对比试加载试验结果,修正损伤理论模型的技术参数。根据理论与试验对比分析结果和挠度校验系数,评估了桥梁剩余刚度及承载能力。同时根据裂缝开展的形态,进行了桥墩不均匀沉降的理论分析计算,分析验证了其最主要病害的原因。

This paper presented the examination technique of a damaged ribbed slab stone arch bridge named Qidong bridge. Furthermore, two finite element models, one considering the damaging extent, the other without, were established to evaluate the theoretical remaining bearing capacity of the bridge. The calculating result was compared with that from onsite loading test, which in converse can be used to modify the parameters of the damaged model. Therefore, the remaining rigidity and bearing capacity were evaluated according to check factor from the calculating and testing result. Besides, theoretical analysis on the non - uniform settlement of the piers was done, that uncovered the main reason of the cracking feature of the piers and the main arch rings.