Numerical Analysis of Wind Loads on a Hemicylindrical Roof Building

Authors: Marco Raciti Castelli, Sergio Toniato, Ernesto Benini

Abstract:

The flow field over a three dimensional pole barn characterized by a cylindrical roof has been numerically investigated. Wind pressure and viscous loads acting on the agricultural building have been analyzed for several incoming wind directions, so as to evaluate the most critical load condition on the structure. A constant wind velocity profile, based on the maximum reference wind speed in the building site (peak gust speed worked out for 50 years return period) and on the local roughness coefficient, has been simulated. In order to contemplate also the hazard due to potential air wedging between the stored hay and the lower part of the ceiling, the effect of a partial filling of the barn has been investigated. The distribution of wind-induced loads on the structure have been determined, allowing a numerical quantification of the effect of wind direction on the induced stresses acting on a hemicylindrical roof.

Keywords: CFD, wind, building, hemicylindrical roof.

Digital Object Identifier (DOI): doi.org/10.5281/zenodo.1071059

References:

[1] P. A. Blackmore, E. Tsokri, G. Breeze, "Wind Loads on Cylindrical Roofs", Proceedings of the International Conference on Urban Wind Engineering and Building Aerodynamics, COST Action C14, Von Karman Institute, Rhode-Saint-Genèse, Belgium May 5-7, 2004.
[2] prEN1991-1-4, Eurocode 1: "Action on Structures - Part 1-4: General Actions - Wind Actions", Stage 49 draft, Jan 2004.
[3] Australian/New Zealand Standard, Structural design actions, "Part 2: wind actions", AS/NZS 1170.2:2002, June 2002.
[4] User-s Guide - "NBC 1995 Structural commentaries (Part 4)", NRC/CNRC, Canadian Commission on Building and Fire Codes, National Research Council of Canada, April 2002.
[5] ASCE Standard, "Minimum design loads for buildings and other structures", ANSI/ASCE 7-95, American Society of Civil Engineers, June 1996.
[6] N. J. Cook, "The designers guide to wind loading of building structures", Part 2, Butterworths, 1995.
[7] M. Raciti Castelli, S. Toniato, E. Benini, "Numerical Analysis of Wind Induced Pressure Loads on an Integrated Roof-Based Photovoltaic System", MAS 2011, The 10th International Conference on Modeling and Applied Simulation, 12-14 September 2011, Rome, Italy.
[8] T. Stathopoulos, "The numerical wind tunnel for industrial aerodynamics: real or virtual in the new millennium?", Wind and Structures, 2002.
[9] T. Stathopoulos, A Baskaran, "Computational simulation of wind environmental conditions around buildings", Engineering Structures, Vol. 18, 876-885, 1996.
[10] N. Timofeyef, "Numerical study of wind mode of a territory development", Proceedings of the 2nd East Europe Conference on Wind Engineering, Prague, Czech Rep., 1998.
[11] A. D. Ferreira, D. X. Viegas, A. C. Sousa, "Numerical and experimental study of the wind flow around a group of low-rise buildings", Proceedings of the 10th International Conference on Wind Engineering, Copenhagen, Denmark, 1999.
[12] T. Stathopoulos, "Wind Effects on People", Proceedings of the International Conference on Urban Wind Engineering and Building Aerodynamics, COST Action C14, Von Karman Institute, Rhode-Saint- Genèse, Belgium, May 5-7, 2004.
[13] R. Yoshie, A. Mochida, T. Tominaga, H. Kataoka, K. Harimoto, T. Nozu, T. Shirasawa, "Cooperative project for CFD prediction of pedestrian wind environment in the Architectural Institute of Japan", Journal of Wind Engineering and Industrial Aerodynamics, 95 (2007), pp. 1551-1578.
[14] Y. Meng, K. Hibi, "Turbulent measurements of the flow field around a high-rise building", J. Wind Eng. Jpn. (76), pp. 55-64, 1998.
[15] K. Hak-Sun, L. Sungsu, C. Gulgi, "Numerical Simulation of Wind around Building Complex", Proceedings of the Seventh Asia-Pacific Conference on Wind Engineering, Nov. 8-12, 2009, Taipei, Taiwan.
[16] C. H. Chang, R. N. Meroney, "Concentration and flow distributions in urban street canyons: wind tunnel and computational data", Journal of Wind Engineering and Industrial Aerodynamics, 91 (2003), pp. 1141- 1154.
[17] M. Raciti Castelli, A. Castelli, E. Benini, "Modeling Strategy and Numerical Validation of the Turbulent Flow over a two-Dimensional Flat Roof", World Academy of Science, Engineering and Technology, Vol. 79 (2011).
[18] DM 14/01/2008 - "Norme tecniche per le costruzioni", issued on the Italian Gazzetta Ufficiale on February 4, 2008.
[19] M. Raciti Castelli, E. Benini, "Effect of Blade Inclination Angle on a Darrieus Wind Turbine", Journal of Turbomachinery, May 2012, Vol. 134, 031016.