动测法评定钢筋砼拱桥承载力初探

通过模型测试手段 ,进行模型破坏性试验 .实测模型在各级荷载作用下的一、二阶固有频率 ,反推出拱桥的抗拉 (压 )刚度和抗弯刚度 .用反推刚度作为计算刚度检算拱桥内力、变形 ,并与设计理论结果、静力测试结果进行比较 .结果表明 ,动测法检算拱桥承载力快速、省时、省力 .

Evaluation for load bearing capacity of R C arch bridge with dynamic method

By the means of experimental model,a failure test was carried out to the model. From the obtained first and second order nature frequencies of the model under each class of loading,tension(compression) resisting stiffness and anti flexure stiffness were induced adversely and can be used as computational stiffness to calibrate arch bridges internal forces and deformations, with which a comparison can be made to the results of theoretical design and static test.The comparison shows that the dynamic method has the advantages of timesaving and convenience.