温度作用下弦支筒壳结构的预应力损失补偿及其性能分析  

Compensation for prestress losses and performance analysis of cable supported barrel vault under temperature action

作　　者：陈志华[1] 刘占省[1] 乔文涛[1] 闫翔宇[1] 

机构地区：[1]天津大学建工学院,天津300072

出　　处：《空间结构》2010年第3期9-12,共4页Spatial Structures

基　　金：国家自然科学基金资助项目(50778122);新世纪优秀人才支持计划资助(NCET-06-0228)

摘　　要：温度是影响预应力钢结构体系受力状态的重要因素之一.作为新提出的预应力空间结构体系——弦支筒壳,其在温度作用下的力学性能和可靠性能还没有进行相关研究.推导了温度作用下拉索预应力损失补偿方法,基于响应面法编制了相应的可靠度计算程序,并根据有限元模型研究了温度作用下弦支筒壳结构的力学性能和可靠性能.算例表明,温度作用下,结构正常使用状态所受的影响较大,其最大位移和适用性方面的可靠度有可能不满足要求,而进行预应力补偿则弥补了温度对结构预应力损失造成的影响.The temperature is an important factor which affects the force status of the pre-stressed steel structure.A new prestressed spatial structure system-cable supported barrel vault structure system was put forward.But the research on the mechanical performance and reliability of structure was not reported.The method of compensation for the prestress losses under temperature action is derived and the correspondry program is developed based on the response method.A finite element model of the cable supported barrel vault was established and the reliability and the temperature impact to the model was calculated.The results indicate that the change of cable expansion coefficient has a great impact on the reliability of the structure.The maximal deflection and the reliability index maybe not meet requirement of the standard.It will be a good the structure after compensating for prestress losses.

关 键 词：弦支筒壳 温度作用 预应力损失 性能分析 膨胀系数 

分 类 号：TU394[建筑科学—结构工程]