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Reliability assessment and performance improvement of long-span roof structure subjected to coupled wind-snow multi-hazard
Abstract Sensitivity to wind and snow loads has been the focus of reliability analysis and safety design of long-span roof structures in cold regions. In this study, the reliability assessment and performance improvement of a long-span roof structure subjected to coupled wind-snow multi-hazard are addressed. To this end, the average wind pressure coefficients of roof surface are first derived from wind tunnel tests, and the two-dimensional wind velocity field simulation is carried out by using the refined spectral representation scheme based on joint wavenumber-frequency power spectrum and stochastic harmonic function. The snow pressure coefficients of structural roof considering wind-induced snow drift effects are obtained by conducting computational fluid dynamics simulation. Then the global reliability of the structure subjected to coupled wind-snow multi-hazard with 100-yr return period is assessed using the probability density evolution method (PDEM). To improve structural performance, a control scheme of distributed tuned mass dampers (d-TMDs) is designed according to the structural dynamics of their deployment positions. Numerical results show that the fluctuating wind is a critical factor resulting in deformation failure of the long-span roof structure, and the proposed control scheme has sound effectiveness and robustness to mitigate the fluctuating wind effect and thus improve the structural performance.
Highlights Two-dimensional wind velocity field of long-span roof is simulated by using the refined spectral representation scheme. Full-scale wind-induced snow drift simulation is carried out by using computational fluid dynamics method. Global reliability of structure subjected to coupled wind-snow multi-hazard is assessed using the PDEM. A control scheme of distributed TMDs is designed according to structural dynamics of their deployment positions. The proposed control scheme has sound effectiveness and robustness to improve structural performance.
Reliability assessment and performance improvement of long-span roof structure subjected to coupled wind-snow multi-hazard
Abstract Sensitivity to wind and snow loads has been the focus of reliability analysis and safety design of long-span roof structures in cold regions. In this study, the reliability assessment and performance improvement of a long-span roof structure subjected to coupled wind-snow multi-hazard are addressed. To this end, the average wind pressure coefficients of roof surface are first derived from wind tunnel tests, and the two-dimensional wind velocity field simulation is carried out by using the refined spectral representation scheme based on joint wavenumber-frequency power spectrum and stochastic harmonic function. The snow pressure coefficients of structural roof considering wind-induced snow drift effects are obtained by conducting computational fluid dynamics simulation. Then the global reliability of the structure subjected to coupled wind-snow multi-hazard with 100-yr return period is assessed using the probability density evolution method (PDEM). To improve structural performance, a control scheme of distributed tuned mass dampers (d-TMDs) is designed according to the structural dynamics of their deployment positions. Numerical results show that the fluctuating wind is a critical factor resulting in deformation failure of the long-span roof structure, and the proposed control scheme has sound effectiveness and robustness to mitigate the fluctuating wind effect and thus improve the structural performance.
Highlights Two-dimensional wind velocity field of long-span roof is simulated by using the refined spectral representation scheme. Full-scale wind-induced snow drift simulation is carried out by using computational fluid dynamics method. Global reliability of structure subjected to coupled wind-snow multi-hazard is assessed using the PDEM. A control scheme of distributed TMDs is designed according to structural dynamics of their deployment positions. The proposed control scheme has sound effectiveness and robustness to improve structural performance.
Reliability assessment and performance improvement of long-span roof structure subjected to coupled wind-snow multi-hazard
Peng, Yongbo (author) / Li, Song (author) / Wang, Shifen (author) / Zhao, Weijie (author) / Zhou, Jian (author) / Zhou, Xuanyi (author)
2023-07-13
Article (Journal)
Electronic Resource
English
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