一种新型单向滑动网架支座有限元模拟及试验研究

Finite element simulation and experimental study on a new unidirectional sliding bearing for grid structures

针对传统螺栓球网架滑动支座由于支座底板与下部预埋板之间摩擦力较大以及生锈等原因导致支座基本不能滑动的问题,提出了一种新型单向滑动网架支座。设计了该新型单向滑动支座的构造,分析了其工作原理及优点,并进行了有限元模拟和试验研究。研究结果表明:在极限荷载作用下,支座肋板首先发生屈曲破坏,此时支座底部聚四氟乙烯板压应力为26MPa,小于容许应力,能够满足使用要求。试验测得支座底部聚四氟乙烯板和不锈钢板之间摩擦系数为0.07左右,表明这种新型单向滑动网架支座摩擦力很小,而且不易生锈,很好地解决了传统支座遇到的问题。

A new unidirectional sliding bearing for grid structures was proposed in order to solve the slide problem of the traditional bolt-ball sliding bearing for grid structures due to the rust and large friction between the upper covering plate and the lower embedded plate. The details of the new sliding bearing were designed and introduced as well as its working principles and advantages. Finite element simulation analysis and experimental study were carried out. The results show that the bearing ribs will buckle first under the ultimate loads with compression stress of 26 MPa for PTFE plate at bottom bearing which is less than allowable stress and meets the requirements for application. Experimental results show that the friction coefficient between PTFE plate and stainless steel plate is about 0. 07,which indicates that the friction of this new sliding bearing is small and there is no rust,and that the new bearing solves the problems encountered in traditional bearings.