中文摘要：

拉索膨胀系数取值一直以来没有定论,为研究不同拉索膨胀系数对预应力钢结构可靠度的影响,本文建立了弦支梁结构有限元模型及其受适用性控制的极限状态方程.采用基于拉丁超立方抽样的蒙特卡罗有限元法,运用APDL语言编制相应的程序,对模型进行了可靠度计算和分析.给出了考虑索不同膨胀系数和不同温差条件下弦支梁结构的体系可靠度和结构各参数的灵敏度.分析表明索膨胀系数的变化对结构体系可靠度影响很大,因此对不同的索材有必要给出精确的膨胀系数,同时对预应力钢结构各参数的灵敏度分析也具有重要意义.

英文摘要：

There has been no conclusion on the value of cable expansion coefficient.In order to study the impact of various cables expansion coefficients on the reliability of the pre-stressed steel structure,a finite element model of the beam string structure and a limit state equation controlled by applicability have been established.The Monte Carlo method based on Latin hypercube sample is adopted and APDL language is applied to write a corresponding program,thereby carrying out reliability calculation and analysis to the model.The system reliability and parameters sensitivity of the beam string structure under different cable expansion coefficients and temperature conditions are provided.The results indicate that the change of cable expansion coefficient has a great impact on the system reliability of the structure,therefore,it is necessary to give precise expansion coefficient according to different cables and it is also important to analyze the sensitivity of each parameter of the pre-stressed steel structure.