竖向动载荷作用下平面框架结构水平动力响应分析

HORIZONTAL DYNAMIC RESPONSES OF PLANE FRAME STRUCTURE UNDER VERTICAL DYNAMIC LOADING

固定旋转机械引起的结构振动及其减、隔振控制是设备减、隔振领域一个十分重要的研究课题.以往的研究主要关注结构的竖向振动,而结构水平向振动往往被忽略.论文以设置有固定旋转设备的单层框架结构为例,分析了结构水平和竖向动位移幅值与结构固有频率、设备安装位置及设备运转频率之间的关系.研究结果表明,在特定条件下,结构水平向振动响应可能大于竖向振动响应,这一现象在设计时应引起足够的重视.

The isolation and control of the vibration of structures under fixed rotating machineries is an important issue. While the vibration in vertical direction is extensively studied, the horizontal vibration is paid little attention. This paper investigates the dynamic behavior of a single-story frame structure under the action of a rotating machinery. The relation between the amplitude of the horizontal/vertical displacement and the natural frequency of the structure, the location and the operating frequency of the machinery is analyzed in detail. The results show that the amplitude of the horizontal vibration can be larger than that in the vertical direction under certain circumstances, which should be taken seriously in design.