- Volume 5 Issue 1
DOI QR Code
Wind flow characteristics and their loading effects on flat roofs of low-rise buildings
- Zhao, Zhongshan (Mustang Engineering Inc.) ;
- Sarkar, Partha P. (Department of Aerospace Engineering and Engineering Mechanics, Iowa State University) ;
- Mehta, Kishor C. (Wind Engineering Research Center (WERC), Department of Civil Engineering, Texas Tech University) ;
- Wu, Fuqiang (ABS Consulting)
- Published : 2002.02.25
Wind flow and pressure on the roof of the Texas Tech Experimental Building are studied along with the incident wind in an effort to understand the wind-structure interaction and the mechanisms of roof pressure generation. Two distinct flow phenomena, cornering vortices and separation bubble, are investigated. It is found for the cornering vortices that the incident wind angle that favors formation of strong vortices is bounded in a range of approximately 50 degrees symmetrical about the roof-corner bisector. Peak pressures on the roof corner are produced by wind gusts approaching at wind angles conducive to strong vortex formation. A simple analytical model is established to predict fluctuating pressure coefficients on the leading roof corner from the knowledge of the mean pressure coefficients and the incident wind. For the separation bubble situation, the mean structure of the separation bubble is established. The role of incident wind turbulence in pressure-generation mechanisms for the two flow phenomena is better understood.
Supported by : US National Science Foundation (NSF)
- Banks, D., Meroney, R.N., Sarkar, P.P., Zhao, Z. and Wu, W. (2000), "Flow visualization of conical vortices on flat roofs with simultaneous surface pressure measurement", J. Wind Eng. Ind. Aerod., 84, 65-85. https://doi.org/10.1016/S0167-6105(99)00044-6
- Hoxey, R. and Short, L. (1999), "Quasi-steady theory developed with experimental verification", Proc. the 10th Int. Conf. on Wind Eng,, 1679-1686, Copenhagen, Denmark.
- Kawaii, H. and Nishimura, G. (1996), "Characteristics of fluctuating suction and conical vortices on a flat roof in oblique flow", J. Wind Eng. Ind. Aerod., 60, 211-225. https://doi.org/10.1016/0167-6105(96)00035-9
- Letchford, C.W., Iverson, R.E. and McDonald, J.R. (1993), "The application of the quasi-steady theory to fullscale measurements on the Texas Tech Building", J. Wind Eng. Ind. Aerod., 48, 111-132. https://doi.org/10.1016/0167-6105(93)90284-U
- Letchford, C.W. (1995), "Simultaneous flow visualization and pressure measurements on the Texas Tech Building", Proc. the 9th Int. Conf. Wind Eng., 524-535, New Delhi, India.
- Lynthe, G. and Surry, D. (1983), "Wind loading of flat roofs with and without parapets", J. Wind Eng. Ind. Aerod., 11, 75-94 https://doi.org/10.1016/0167-6105(83)90091-0
- Marwood, R. (1996), "An investigation of conical roof edge vortices", Ph.D. dissertation, Lincoln College, University of Oxford.
- Sarkar, P.P., Zhao, Z. and Mehta, K.C. (1997), "Flow visualization and measurement on the roof of the Texas Tech Building", J. Wind Eng. Ind. Aerod., 69-71, 597-606. https://doi.org/10.1016/S0167-6105(97)00190-6
- Tieleman, H.W. (1992), "Problems associated with flow modeling procedures for low-rise structures", J. Wind Eng. Ind. Aerod., 41-22, 923-934.
- Tieleman, H.W., Surry, D. and Lin, J.X. (1994), "Characteristics of mean and fluctuating pressure coefficients under corner (delta wing) vortices", J. Wind Eng. Ind. Aerod., 52, 263-275. https://doi.org/10.1016/0167-6105(94)90052-3
- Woo, H.G.G., Peterka, J.A. and Cermak J.E. (1977), "Wind-tunnel measurements in the wakes of structures", NASA Contractor Report NASA CR-2806, National Aeronautics and Space Administration.
- Zhao, Z. (1997), "Wind flow characteristics and their effects on low-rise buildings", Ph.D. dissertation, Department of Civil Engineering, Texas Tech University.
- Bivariate Quasi-Steady Model for Prediction of Roof Corner Pressures vol.19, pp.1, 2006, https://doi.org/10.1061/(ASCE)0893-1321(2006)19:1(29)
- Stationary vortices attached to flat roofs vol.98, pp.1, 2010, https://doi.org/10.1016/j.jweia.2009.09.001
- Full-scale testing to evaluate the performance of standing seam metal roofs under simulated wind loading vol.105, 2015, https://doi.org/10.1016/j.engstruct.2015.10.006