Bivariate Quasi-Steady Model for Prediction of Roof Corner Pressures
Publication: Journal of Aerospace Engineering
Volume 19, Issue 1
Abstract
Extremely high-suction pressures generated beneath the conical vortex flow in the roof-corner region have a devastating effect on the building roofs in high-wind events. The application of quasi-steady theory near the roof corners of low-rise buildings deserves careful investigation for the appropriate assessment of the design wind loads. A synchronized incident wind and pressure data acquisition system was set up on the full-scale experimental building at Texas Tech Univ. Experiments were conducted systematically to simultaneously collect the incident wind and roof-corner pressure data under the influence of cornering winds. By using a conditional sampling technique, a bivariate quasi-steady model was established to incorporate the influence of both horizontal and vertical wind directional variations on the roof-corner pressures. Comparison between the measured pressures and the model-predicted pressures has shown that the quasi-steady theory in the suggested form is applicable in the roof-corner separated flow region where vortices are present. This conclusion further justifies the application and codification of quasi-steady approach for wind load assessment of low-rise buildings and other structures.
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Acknowledgments
This study was part of the Colorado State University/Texas Tech University Cooperative Program in Wind Engineering (Grant No. UNSPECIFIEDCPWE 1995-2000). The financial support of the U.S. National Science Foundation (Grant No. NSFCMS-9409869) for this program is acknowledged. The writers thank Professor Kishor C. Mehta (Founding Director, WISE) for his guidance and project leadership in this study.
References
Banks, D., and Meroney, R. N. (2001). “The applicability of quasi-steady theory to pressure statistics beneath roof-top vortices.” J. Wind. Eng. Ind. Aerodyn., 89, 569–598.
Cook, N. J. (1990). The designer’s guide to wind loading of building structures. Part 2: Static structures, Building Research Establishment, Butterworths, London.
Hoxey, R. P., Richards, P. J., Richardson, G. M., Robertson, A. P., and Short, J. L. (1995). “The Silsoe structures building: The completed experiment Part 2.” Proc., 9th Int. Conf. on Wind Engineering; Vol. 3, New Delhi, India, 1115–1126.
Hoxey, R. P., Short, J. L., and Richards, P. J. (1999). “Quasi-steady theory developed with experimental verification.” Proc., 10th Int. Conf. on Wind Engineering, Vol. 3, Copenhagen, Denmark, 1679–1686.
Kawai, H. (1983). “Pressure fluctuations on square prisms—Applicability of strip and quasi-steady theories.” J. Wind. Eng. Ind. Aerodyn., 13, 197–208.
Letchford, C. W. (1995). “Simultaneous flow visualization and pressure measurements on the Texas Tech building.” Proc., 9th Int. Conf. on Wind Engineering, Vol. 1, New Delhi, India, 524–535.
Letchford, C. W., Iverson, R. E., and McDonald, J. R. (1993). “The application of the quasi-steady theory to full scale measurements on the Texas Tech building.” J. Wind. Eng. Ind. Aerodyn., 48, 111–132.
Letchford, C. W., and Marwood, R. (1997). “On the influence of and component turbulence on roof pressures beneath conical vortices.” J. Wind. Eng. Ind. Aerodyn., 69–71, 567–577.
Levitan, M. L., and Mehta, K. C. (1992a). “Texas Tech field experiments for wind loads Part I: Building and pressure measuring system.” J. Wind. Eng. Ind. Aerodyn., 41–44, 1565–1576.
Levitan, M. L., and Mehta, K. C. (1992b). “Texas Tech field experiments for wind loads Part II: Meteorological instrumentation and terrain parameters.” J. Wind. Eng. Ind. Aerodyn., 41–44, 1577–1588.
Marwood, R., and Wood, C. J. (1997). “Conical vortex movement and its effect on roof pressures.” J. Wind. Eng. Ind. Aerodyn., 69–71, 589–595.
Richards, P. J., Hoxey, R. P., and Wanigaratne, B. S. (1995). “The effect of directional variation on the observed mean and rms pressure coefficients.” J. Wind. Eng. Ind. Aerodyn., 54–55, 359–367.
Richardson, G. M., Hoxey, R. P., Robertson, A. P., and Short, J. L. (1995). “The Silsoe structures building: The completed experiment Part 1.” Proc., 9th Int. Conf. on Wind Engineering, Vol. 3, New Delhi, India, 1103–1114.
Wu, F. (2000). “Full-scale study of conical vortices and their effects near roof corners.” PhD dissertation, Texas Tech Univ., Lubbock, Tex.
Wu, F., Sarkar, P. P., and Mehta, K. C. (2001a). “Full-scale study of conical vortices and roof corner pressures.” Wind Struct., 4(2), 131–146.
Wu, F., Sarkar, P. P., Mehta, K. C., and Zhao, Z. (2001b). “Influence of incident wind turbulence on pressure fluctuations near flat-roof corners.” J. Wind. Eng. Ind. Aerodyn., 89, 403–420.
Zhao, Z., Sarkar, P. P., Mehta, K. C., and Wu, F. (2002). “Wind flow characteristics and their effects on flat roofs of low-rise buildings.” Wind Struct., 5(1), 25–48.
Information & Authors
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Published In
Journal of Aerospace Engineering
Volume 19 • Issue 1 • January 2006
Pages: 29 - 37
Copyright
© 2006 ASCE.
History
Received: Sep 9, 2003
Accepted: Feb 14, 2005
Published online: Jan 1, 2006
Published in print: Jan 2006
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