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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.
Temperature is one of the important factors that affect the stress state of prestressed steel structure system.As a newly proposed prestressed space structure system - chord support shell, its mechanical properties and reliability under the action of temperature have not been studied. Based on the finite element model, the mechanical properties and the reliability of the chord supported by the shell under temperature are studied. The calculation results show that, Under the action of temperature, the normal structure of the structure is greatly affected, and the reliability of maximum displacement and applicability may not meet the requirements. However, the prestress compensation compensates for the influence of temperature on the prestress loss of the structure.