中文摘要：

研究索杆张力结构在极限状态下的可靠性，利用可靠度分析中的响应面法，对索穹顶结构在极限状态下的可靠性进行分析，并与ANSYS中蒙特卡罗法计算结果进行比较。分析结果表明，响应面法具有足够高的精度；张力结构拉索松弛失效可靠指标不符合规范GB 50068-2001要求，是控制结构失效的主要形式。

英文摘要：

In order to better understand the reliability of cable-strut tensile structures under limit states, the Re-sponse Surface Method （ RSM） was employed to analyze the reliabilities of cable-strut tensile structures, and results by RSM were compared with the ones by Monte Carlo Method in software ANSYS. The results show that RSM has a high enough precision in the calculation of reliability for cable-strut tensile structures, and the reliability index of stress relaxation in cable cannot meet the requirement stipulated by GB 50068-2001 , which will become a primary failure mode for consideration in practical application.