本文应用Benfield和Hruda提出的部件模态置换法(下称B—H方法)对塔式起重机作振动分析。对一般塔式起重机的计算模型作了部件模态综合过程解析推导,并对下回转式塔式起重机模型作了实例计算,绘出了二阶的模态形状,给出了数值结果比较。 In this paper, the modal replacement method (hereinafter referred to as B-H method) proposed by Benfield and Hruda is applied to the vibration analysis of the tower crane. The analysis and derivation of the component mode synthesis process for the calculation model of the general tower crane was carried out. The lower rotary tower crane model was calculated by example. The second-order mode shape was drawn and the numerical results were compared.