集中荷载作用下悬索张力的检测与实验

Detection and Experiment for the Tensile Force Of Suspended Cables Under Concentrated Load

推导了移动集中荷载作用下悬索的非线性振动方程,用瑞利能量法得到索力与悬索固有频率之间的计算公式,同时用实验的方法测量了悬索索力与自振频率的关系.结果表明:索力不单决定于悬索的固有频率,还与集中荷载大小及其在悬索上的位置有关,采用传统的索力计算公式将产生很大的误差.

Nonlinear vibration equations of strings under a moving concentrated load were derived.Correlated formulae of the tensile force and natural frequency of suspended cables were obtained by Rayleigh energy method. These two parameters were measured through experiments.Results point out that the tensile force is not only determined by the natural frequency of a suspended cable but also related to the weight of concentrated load and its position on the cable.Errors would occur if traditional formulae of the tensile force should be employed to calculate.