带抗风夹直立锁缝屋面系统抗风揭可靠度分析

为评估带抗风夹直立锁缝屋面系统安全水平，构建了一种高效的带抗风夹直立锁缝屋面系统抗风揭可靠度分析方法。首先建立了带抗风夹直立锁缝屋面系统力学模型并获取相应失效准则；随后基于等价极值事件、扩展型共轭无迹变换法和最大熵原理建立了多失效模式下带抗风夹直立锁缝屋面系统抗风揭可靠度分析方法；最后，结合工程算例验证了本文方法的可行性。结果表明：相比于MCS法，本文方法计算的可靠指标最大相对误差为0.63%,而计算时间仅为MCS的0.04%,可准确高效地进行多失效模式下带抗风夹直立锁缝屋面系统可靠度分析；带抗风夹直立锁缝屋面系统屋面板撕裂破坏概率最大，支座破坏次之，脱扣破坏概率为0,添加抗风夹后能有效防止直立锁缝屋面系统发生脱扣破坏；单一失效模式下带抗风夹直立锁缝屋面系统结构失效概率比多失效模式偏小，为保证结构安全性，建议考虑多失效模式反映其可靠指标。

Reliability analysis of wind-uplifted resistance of standing seam roof system with anti-wind clips

For the assessment of the safety level of the standing seam roof system with anti-wind clips (SSRS-AWC), an efficient method was proposed to analyze the reliability of wind-uplifted resistance of SSRS-AWC. Firstly, the mechanical model of SSRS-AWC was established and the corresponding failure criterion was obtained. Then, on the basis of the equivalent extreme-value event, the extended conjugate unscented transformation (ECUT) method, and the principle of maximum entropy, the analysis method for wind-uplifted resistance reliability of SSRS-AWC under multiple failure modes was proposed. Finally, the feasibility of the analysis method was verified by an engineering example. Results show that compared with the Monte Carlo simulation (MCS) method, the maximum relative error of reliability index of proposed method was 0.63%, and the calculation time was only 0.04% of the MCS method, which can accurately and efficiently analyze the reliability of SSRS-AWC under multiple failure modes. The failure probability of SSRS-AWC in descending order was the roof panel tearing damage, the clip rupture, and the clip separation from seam with a probability of 0. It indicates that the addition of anti-wind clips can effectively avoid the clip separation from seam of SSRS-AWC. The failure probability of SSRS-AWC under single failure mode was smaller than that under multiple failure modes. For the sake of structural safety, it is recommended to consider reliability index under multiple failure modes.