一、前言肋形楼板是梁板系统多跨连续结构,在机器动荷载作用下,其振动计算十分复杂。肋形楼板的自由振动具有十分密集的频谱,振型复杂多样,目前还缺乏完善的计算方法。在设计中一般都是采用一些简化假定,而这些简化使楼板的自振特性发生性质上的改变。 I. INTRODUCTION The rib floor slab is a multi-span continuous structure of the beam-slab system. Under the action of the machine dynamic load, the vibration calculation is very complicated. The free vibration of the ribbed floor has a very dense spectrum, and the vibration modes are complex and diverse. At present, there is still a lack of perfect calculation methods. In the design, some simplifying assumptions are generally used, and these simplifications cause the natural vibration characteristics of the floor to change.