在役钢筋混凝土拱桥病害分析和力学性能研究

结合某在役三跨钢筋混凝土拱桥结构的现场检测,对该拱桥结构的静、动力力学性能进行了有限元计算。获得了大桥静载下的变形信息和振动特性信息,为大桥的抗震、抗风分析建立了基础;通过验算荷载对布载最不利位置的检验,全面评估大桥的安全状态;通过静载实测的数值与有限元模型数值的对比,研究了拱桥的力学性能,评估分析了拱桥结构过早出现病害的主要原因,为在役拱桥的安全性评价和健康诊断提供了理论依据。

Damage Analysis and Mechanical Performance Study for a Reinforced Concrete Arch Bridges in Service

Safety evaluation and retrofitting strategies have become to be an urgent problem for large numbers of old bridges. To this end, it is necessary to have a good knowledge of the mechanical performance of damaged structures. Therefore, researches into the damage mechanism and mechanical performance of the reinforced concrete arch bridge are important and valuable. In this paper, based on damage measurement of an old three-span reinforced concrete arch bridge, the static and dynamic performance of the reinforced concrete arch bridge were numerically modelled by Finite Element Method (FEM). Deformation and vibration characteristic data, which contribute to aseismic analysis, are obtained. By locating the loads on the worst points, safety condition of the old bridge is roughly evaluated. Based on the comparison between the FEM and experiment results, the critical reasons which result in the premature damage of the bridge were analyzed, which will form a theoretical basis for the safety evaluation and health diagnosis of the bridges in service.