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Steel and Composite Structures Volume 22, Number 5, December10 2016 , pages 1039-1054 DOI: https://doi.org/10.12989/scs.2016.22.5.1039 |
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Dynamic characteristics and wind-induced vibration coefficients of purlin-sheet roofs |
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Yingying Zhang, Xiaoguang Song and Qilin Zhang
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| Abstract | ||
| This paper presents the dynamic characteristics analysis of the purlin-sheet roofs by the random vibration theories. Results show that the natural vibration frequency of the purlin-sheet roof is low, while the frequencies and mode distributions are very intensive. The random vibration theory should be used for the dynamic characteristics of the roof structures due to complex vibration response. Among the first 20th vibration modes, the first vibration mode is mainly the deformations of purlins, while the rest modes are the overall deformations of the roof. In the following 30th modes, it mainly performs unilateral local deformations of the roof. The frequency distribution of the first 20th modes varies significantly while those of the following 30th modes are relatively sensitive. For different parts, the contributions of vibration modes on the vibration response are different. For the part far from the roof ridge, only considering the first 5th modes can reflect the wind-induced vibration response. For the part near the ridge, at least the first 12 modes should be considered, due to complex vibration response. The wind vibration coefficients of the upwind side are slightly higher than that of the leeward side. Finally, the corresponding wind vibration coefficient for the purlin-sheet roof is proposed. | ||
| Key Words | ||
| purlin sheet roof; random vibration theory; dynamic characteristic; wind-induced vibration coefficient | ||
| Address | ||
| (1) Yingying Zhang: State Key Laboratory for GeoMechanics and Deep Underground Engineering, Jiangsu Key Laboratory of Environmental Impact and Structural Safety in Engineering, China University of Mining and Technology, Xuzhou Jiangsu, 221116, China; (2) Xiaoguang Song: Shandong Academy of building research, Jinan Shandong, 250031, China; (3) Qilin Zhang: College of Civil Engineering, Tongji University, Shanghai 200092, China. | ||