Wind Uplift Fragility Assessment Method of 360° Standing Seam Roof System and Its Application in Wind Damage Estimation of UHV Converter Station
Publication: Journal of Structural Engineering
Volume 149, Issue 5
Abstract
The 360° standing seam roof system (360° SSRS) often suffers structural damage or even failure under wind uplift pressure with varied strength ratings. Under the action of wind uplift pressure, the prediction of 360° SSRS damage degree plays an important role in the risk assessment and postdisaster measures for buildings. In this work, a wind-uplift fragility assessment method is proposed to forecast the damage degree of 360° SSRS, which considers the multistage performance levels in the whole wind-induced failure process of 360° SSRS. First, a refined finite-element (FE) model, including roof panels, sliding support, and purlin, is established to analyze the wind-induced failure process of 360° SSRS. Meanwhile, the existing experimental results are used to verify the correctness of the FE model. Second, according to the whole wind-induced failure process of 360° SSRS, the failure process is qualitatively classified into three-stage performance levels (i.e., PL I, PL II, and PL III) and four damage states (i.e., slight damage, moderate damage, severe damage, and tripping failure). On this basis, the damage indicator, which is the node relative displacement of the female buckle, is defined to quantitatively derive the three-stage performance levels. Thirdly, the Latin hypercube sampling (LHS) technology in conjunction with derived multistage performance levels is employed to carry out the wind-uplift fragility assessment, which can reflect the probabilistic characterization between wind uplift pressure and damage state of 360° SSRS. Finally, the proposed method is applied to a 360° SSRS of an ultrahigh-voltage (UHV) converter station in actual engineering, in which wind tunnel tests are used to determine extreme wind pressure coefficients of 360° SSRS. The results demonstrate that the proposed method is feasible and suitable, and the obtained fragility curves can be applied as a reference for predicting wind-induced damage degree, failure probability, and wind-resistance capacity of 360° SSRS.
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Data Availability Statement
Some or all data, models, or code that support the findings of this study are available from the corresponding author upon reasonable request.
Acknowledgments
The research presented in this paper is supported by the National Key Research and Development Project of China (Grant No. 2017YFC0703901) and NSFC-JSPS China-Japan Scientific Cooperation Project (NSFC Grant No. 51611140123). These supports are gratefully acknowledged.
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Published In
Journal of Structural Engineering
Volume 149 • Issue 5 • May 2023
Copyright
© 2023 American Society of Civil Engineers.
History
Received: Aug 18, 2022
Accepted: Jan 3, 2023
Published online: Feb 24, 2023
Published in print: May 1, 2023
Discussion open until: Jul 24, 2023
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