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

Abstract:

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.