双弹簧支撑ETFE枕式膜结构性能研究  

Studies on structural behavior of ETFE foil spring cushion structure consisting of two spring units

作　　者：吴明儿[1] 毛元庆[1] 

机构地区：[1]同济大学建筑工程系,上海200092

出　　处：《建筑结构学报》2013年第11期57-62,共6页Journal of Building Structures

基　　金：高等学校博士学科点专项科研基金项目(20110072110036)

摘　　要：利用压缩弹簧代替充气形成无需充气设备的ETFE薄膜结构,采用数值分析与模型试验方法对双弹簧支撑ETFE枕式膜结构的可行性及结构性能进行研究。数值分析结果表明:膜面形状由膜面初始应力和弹簧弹力之比决定;弹簧刚度对膜面应力影响较小,增大弹簧刚度可减小膜面位移但使荷载作用下弹簧弹力的变化增大;膜面矢跨比对膜面应力影响不大,但减小矢跨比使膜面变形增大。模型试验结果表明:膜面成形可通过调整弹簧弹力完成,方法简便可靠,膜面成形精度较高;加载试验中弹簧支撑系统工作可靠,可以较好地追随并张紧膜面;支撑点处膜面应力集中不明显,试验结果与数值分析结果吻合较好。By means of the compression of spring to take the place of air pressure, the ETFE foil spring cushion structure system needs no air supply and control equipments, no running energy compared with the traditional air cushion structure. In this paper, the structural behavior of the ETFE foil spring cushion structure consisting of two spring units is studied through numerical analysis and model experiment. Though numerical analysis, the shape of cushion can be determined by the ratio of initial membrane stress to compression of spring. The stiffness of spring has little influence on the membrane stress, but the displacement of membrane surface decreases and the change of compression of spring increases when the stiffness of spring becomes larger in the case of wind or snow load. The ratio of rise to span has also little influence on the membrane stress, but smaller ratio leads to larger displacement. In the model experiment, the membrane surface is easily formed by means of adjusting the compression of spring. In loading test, the spring system worked well and the membrane surface was tensioned continuously by it. The experimental results agreed with those from numerical analysis

关 键 词：膜结构 ETFE膜材 弹簧支撑 模型试验 数值计算 

分 类 号：TU359[建筑科学—结构工程]