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