AN EXPERIMENTAL INVESTIGATION OF WIND LOAD ON TALL BUILDINGS WITH HEXAGONAL CROSS-SECTION

  • Kaniz Ronak Sultana BUET
  • Dr. Amalesh Chandra Mandal BUET
  • Bhuiyan Shameem Mahmood Ebna Hai MIST
Keywords: Reynolds Number, Lift, Drag, Pressure coefficient, Lift and drag coefficient.

Abstract

An experimental investigation of surface static pressure distributions on hexagonal cylinder was conducted. The study
was performed on both the single cylinder and the group consisting of two cylinders, one in the upstream and another
in the downstream side. The test was conducted in an open circuit wind tunnel at a Reynolds number of 4.13 x 104
based on the face width of the cylinder across the flow direction in a uniform flow of velocity 13.2 m/s. The study was
done on the single cylinder at various angles of attack from 00 to 500 at a step of 100. The surface pressure
distributions were measured with the help of an inclined manometer. Then the group of two cylinders was taken into
consideration for the study and the surface static pressures were measured for various inter-spacing of 1D, 2D, 3D,
4D, 6D and 8 D, D being the width of the cylinder across the flow direction. In each case the wind velocity was kept
constant at 13.2 m/s. The pressure coefficients were calculated from the measured values of the surface static pressure
distributions on the cylinder. Then the drag and lift coefficients were obtained from the pressure coefficients by the
numerical integration method. It was observed that the drag coefficients become remarkably smaller compared to
those for a sharp-edged square cylinder. It was also observed that at various angles of attack, the values of the lift
coefficients were insignificant compared to those for a sharp-edged square cylinder. It can be further concluded that
the hexagonal cylinder produces significantly low values of drag and lift forces and they approach to those of the
cylinder with circular cross-section.

Downloads

Download data is not yet available.

References

1. Baines W D, “Effects of Velocity Distribution
on Wind Loads and Flow Patterns on Buildings”,
Proceedings of a Symposium on Wind Effects on
Buildings and Structures”, Teddington, U.K.1963,
pp.197-225.
2. Bostock B R and Mair W A, “Pressure
Distributions and Forces on Rectangular and D-shaped
Cylinders”, The Aero-dynamical Quarterly, Vol.23,
1972, pp. 499-511.
3. Castro J P and Fackrell J E, “A Note on Two-
Dimensional Fence Flows with Emphasis on Wall
Constraint”, J. Industrial. Aerodynamics, 3(1), March
1978.
4. Davis R W and Moore E F, “A Numerical
Study of Vortex Shedding from Rectangular
Cylinder,” Journal of Fluid Mechanics, Vol.116,
pp.475-506.
5. Hossain M K M, Islam M Q, Mandal A C and
Saha S, “Wind Effect on Staggered Cylinders of
Square and Rectangular Sections with Variable
Longitudinal Spacing”, Transaction of the Mech. Eng.
Div., The Institution of Engineers, Bangladesh, Vol.
ME38, Dec. 2007, pp. 52-57.
6. Hussain H S and Islam O, “Study of wind
Load on Buildings and Structures” Journal of the
Institution of Engineers, Bangladesh, Vol.1.Nos.2-3,
July-October, 1973.
7. Islam A M T and Mandal A C, "Experimental
Analysis of Aerodynamic Forces for Cross Flow on
Single Rectangular Cylinder", Mechanical Engineering
Research Bulletin, BUET, Dhaka, Vol. 13, No. 1,
1990, pp. 36-51.
8. Lawson T V, ‘’Wind Loadings of Buildings,
Possibilities from a Wind Tunnel Investigation,”
University of Bristol, U. K. Report on TVL/731A,
August, 1975.
9. Mandal A C, “A study of Wind Effects on
Square Cylinders” M. Sc. Engg. Thesis, Mechanical
Engineering Department, BUET, 1979.
10. Mchuri F G et al, “Effects of the free stream
Turbulences on Drag Coefficients of Bluff sharp –
Edged Cylinders,” Nature, Vol.224. No.5222,
November 29, 1969, pp. 908-909.
11. M. K. M. Hossain, M. Q. Islam, A. C. Mandal
and S. Saha, “Wind effect on staggered cylinders of
square and Rectangular sections with variable
longitudinal spacings,” Journal of Mechanical
Engineering, vol. ME38, Dec. 2007, pp-52-57.
12. Parkinson G V and Modi V J, “Recent
Research on Wind Effects on Bluff Two Dimensional
Bodies,” Proceedings, International Research Seminar,
Wind Effects on Buildings and Structures, Ottawa,
Canada, 1967, pp. 485-514.
13. Surry D, “Pressure Measurements on the
Texas Tech Building: Wind Tunnel Measurements and
Comparison with Full Scale”, J. Wind Eng. Ind.
Aerodynamics.no.38, 1991, pp. 235-247.
Published
2019-11-28
How to Cite
Kaniz Ronak Sultana, Dr. Amalesh Chandra Mandal, & Bhuiyan Shameem Mahmood Ebna Hai. (2019). AN EXPERIMENTAL INVESTIGATION OF WIND LOAD ON TALL BUILDINGS WITH HEXAGONAL CROSS-SECTION. MIST INTERNATIONAL JOURNAL OF SCIENCE AND TECHNOLOGY, 2(1). https://doi.org/10.47981/j.mijst.02(01)2010.77(%p)