纺锤形Tensairity结构基本力学性能研究  

Basic mechanical behaviour of spindle Tensairity structures

作　　者：曹正罡[1] 张雄迪[1] 范峰[1] 孙瑛[1] 

机构地区：[1]哈尔滨工业大学,黑龙江哈尔滨150090

出　　处：《土木工程学报》2011年第1期11-18,共8页China Civil Engineering Journal

基　　金：中国博士后科学基金(20070420876);国家自然科学基金(50778054)

摘　　要：Tensairity结构体系在我国尚未应用。为掌握Tensairity的有限元分析方法和基本力学性能,利用ANSYS软件构建了纺锤形Tensairity结构的精细化有限元模型,实现了结构从初始态到受荷态的全过程分析。与国外学者开展的试验进行数值模拟,结果吻合较好。在此基础上,开展了集中荷载作用下,内气压、构件截面、膜材刚度等参数对Tensairity结构受力性能的影响规律研究。结果显示,Tensairity受力特点是通过上下弦构件间的轴向力偶来抵抗外荷载,实现了结构受力拉压分离的设计思想。提高初始内气压、增大上下弦构件截面和提高跨径比是增加结构整体刚度的有效手段;工程实践中应采取措施保证气肋与上下弦构件的有效连接,避免气肋侧向翻转而导致结构失效;同时应保证气肋的密闭性和内气压稳定性。The Tensairity structure system has not yet been employed in China. In order to master the finite element analysis method for Tensairity and obtain the basic mechanical properties, a fine spindle Tensairity finite element model was formed by using ANSYS, and the complete progress analysis of the structure were carried out from initial state to the loading state. The numerical analysis agreed well with the results of the experiments in the literature. The effects of various parameters, including inner pressure, member cross section, and membrane stiffness, etc. , on the mechanical properties of Tensairity structures were investigated under concentrated load. The results showed that the mechanical characteristic of Tensairity is in that it can balance the exterual load by a moment from the axial force of the members of upper and lower chord, thus the design of the separation of tension and compression. Effective methods to increase the overall stiffness of the Tensairity structure include raising initial inner pressure, enlarging the cross section area of the upper and lower chord, and augmenting the span-diameter ratio. A valuable suggestion was that the effective connection between the pneumatic rib and the members of upper and lower chord should be guaranteed to avoid the pneumatic rib from turning around, which may lead to structural failure, and that the pneumatic rib＇s tightness and the stability of inner pressure should also be guaranteed.

关 键 词：Tensairity 张弦结构 气肋 有限元 

分 类 号：TU353[建筑科学—结构工程] TU393.3