摘要
张弦空间结构是一种性能优越、结构形式丰富、具有广阔应用发展空间的结构形式,近年来已在大跨度公共建筑中得到了广泛的应用。虽然对几种典型工程结构的静、动力性质及施工方面的研究取得了较多成果,但对这一类空间结构的极限承载力、极限状态发展过程的分析仍存在许多不足。为研究此类结构弹塑性极限状态发展过程的共性与特点,以3个体育馆屋盖张弦空间结构为研究对象,采用有限元方法对结构进行弹塑性极限承载力全过程分析,分析张弦空间结构的屈服机制、失效机制和滑动支座张弦结构的全过程反应特征,总结大跨度空间结构的内力重分布规律和荷载传递规律。分析表明,张弦空间结构的预应力索杆体系可有效提高结构的刚度和极限承载能力,张弦结构的极限承载力通常由强度控制;结构的空间几何形态是影响结构刚度和塑性发展过程的关键因素。此研究增进了对大跨度张弦结构空间工作性能的理解,有助于指导结构设计。
Spatial beam string structures have lots of advantages and are widely used for large span public structures. Although significant progress has been made in the study of the static and construction behavior of several structures, there are still deficiencies for the analysis of structural ultimate capacities. To better understand the general characteristics of this type of structure, the elastoplastic ultimate capacities of spatial beam string structures of three gymnasiums are analyzed by using the finite element method. The yielding mechanism, collapse mechanism and the properties of structures with sliding supports are analyzed. The development of plasticity and the redistribution of internal force of the long-span spatial structures are summarized. The results show that prestressed cable-strut system of spatial beam string structure can enhance the vertical stiffness and the ultimate capacity of the whole structure. Collapse of the whole structure is due to material damage. The geometrical formation of the structure is one of the key factors which influence the distribution of internal force and plasticity. The results of the analysis can serve as a guide for structural design.
出处
《土木工程学报》
EI
CSCD
北大核心
2008年第8期8-14,共7页
China Civil Engineering Journal
关键词
张弦空间结构
弹塑性极限承载力
失效机制
内力重分布
spatial beam string structure
elastoplastic ultimate capacity
collapse mechanism
redistribution of inner force
