三向球面空腹网壳结构的动力特性研究

Dynamic characteristics of three-dimensional reticulated vierendeel shell

三向球面空腹网壳是一种新型的空间结构形式,它可以看成是两个同曲率中心的三向网格球面单层网壳仅通过腹杆相连而成,并且连接上下弦的腹杆都指向曲率中心。采用子空间迭代法对三向球面空腹网壳的自振特性进行了研究,通过改变网壳的矢跨比、厚度、腹杆截面、荷载大小以及支座约束等参数,全面探讨了该结构的动力特性,得到了该结构基频随参数变化规律。

Three-dimensional reticulated vierendeel shell is a new form of space structures,which can be seen as two same curvature single-layer spherical lattice shells with three-dimensional girds only connected by web members,and all web members point to curvature center.In this paper,natural vibration characteristics of three-dimensional reticulated vierendeel shell are analyzed by subspace iteration method.By means of changing the rise-to-span ratio,shell thickness,section area of the web member,load size and the support restraint,dynamic characteristics of the structure are totally discussed.Some regular conclusions are given.