A Study on the Non-Gaussian Property by the Method of Limiting Streamline

Abstract:

Under wind action, the property of non-Gaussian wind pressure distribution is very important for determination of peak factor, simulation of fluctuating wind pressure and design of cladding and components. Since the distribution of non-Gaussian zone is highly irregular based on the statistical method, any effort on giving regular non-Gaussian zone regions cant reflect the real non-Gaussian property. Considering the fact that non-Gaussian property was induced by flow separation and generally the movement of vortex showed the character of time averaged steady, taking a typical low-rise building as the example, the distribution of limiting streamlines and the theory of flow separation was applied in the research. Results show that the distribution of limiting streamlines has a close relationship with the intensity of non-Gaussian property and can be used as an intuitionistic tool in the research of identification and mechanism for non-Gaussian properties.

• Periodical: Advanced Materials Research (Volumes 919-921)
• Pages: 1390-1395
• DOI: https://doi.org/10.4028/www.scientific.net/AMR.919-921.1390
• Online since: April 2014
• Authors: Xu Feng Sun
• Keywords: Flow Separation, Fluctuating Wind Pressure, Limiting Streamline, Low-Rise Building, Non-Gaussian Property

References

[1] J.A. Peterka, J.E. Cermak: Wind pressures on buildings-probability densities. Journal of Structual Division, ASCE Vol. 101(6)(1975), pp.1255-1267.

DOI: 10.1061/jsdeag.0004076

[2] T. Stathopoulos: PDF of wind pressures on low-rise buildings. Journal of Structual Division, ASCE Vol. 106(5)(1980), pp.973-990.

DOI: 10.1061/jsdeag.0005443

[3] J.D. Holmes: Wind action on glass and Brown's integral. Engineering Structures, Vol. 7(4)(1985), pp.226-230.

[4] Y.J. Tian, N. Yang, Y. Yang: Analysis on wind-induced damage of long-span roof structures. Journal of Wuhan University of Technology, Vol. 34(6)(2012), pp.109-113. (in Chinese).

[5] J. Li, X. Wang: An exponential model for fast simulation of multivariate non-Gaussian processes with application to structural wind engineering. Probabilistic Engineering Mechanics, Vol. 30(2012), pp.37-47.

DOI: 10.1016/j.probengmech.2012.03.001

[6] K.S. Kumar, T. Stathopoulos: Wind loads on low building roofs: a stochastic perspective. Journal of Structural Engineering, Vol. 126(8)(2000), pp.944-956.

DOI: 10.1061/(asce)0733-9445(2000)126:8(944)

[7] M. Giorffe, V. Gusella, M. Grigoriu: Non-Gaussian wind pressure on prismatic buildings. I: Stochastic field. Journal of Structural Engineering, Vol. 127(9)(2001), pp.981-989.

DOI: 10.1061/(asce)0733-9445(2001)127:9(981)

[8] D. Bank, R.N. Meroney: The applicability of quasi-steady theory to pressure statistics beneath roof-top vortices. Journal of Wind Engineering and Industrial Aerodynamics, Vol. 89(2001), pp.569-598.

DOI: 10.1016/s0167-6105(00)00092-1

[9] H. Tryggeson, M.D. Lyberg: Stationary vortices attached to flat roofs. Journal of Wind Engineering and Industrial Aerodynamics, Vol. 98(2010), pp.47-54.

DOI: 10.1016/j.jweia.2009.09.001

[10] X. Dong, J.H. Ye: The point and area-averaged wind pressure influenced by conical vortices on saddle roofs. Journal of Wind Engineering and Industrial Aerodynamics, Vol. 101(2012), pp.67-84.

DOI: 10.1016/j.jweia.2011.12.001

[11] T.C.E. Ho, D. Surry, D. Morrish: NIST/TTU cooperative agreement - windstorm mitigation initiative: wind tunnel experiments on generic low buildings. The Boundary Layer Wind Tunnel Laboratory, University of Western Ontario(2003).

[12] A. Surana, G.B. Jacobs, O. Grunberg, G. Haller: An exact theory of three-dimensional fixed separation in unsteady flows. Physics of Fluids, Vol. 20(2008), 107101.

DOI: 10.1063/1.2988321

[13] M. Tobak, D.J. Peake: Topology of three-dimensional separated flows, USA: NASA Technical Memorandum 81294(1981).

[14] H.X. Zhang: The separation criteria and flow behavior for three dimensional steady separated flow, Acta Aerodynamics Sinica, Vol. 1(1985), pp.1-12. (in Chinese).

[15] H.X. Zhang: Structural analysis on flow separation and vortex, Beijing: National Defence Industry Press(2002). (in Chinese).