Yuksek yapilar in etrafindaki akim alani

Alongside vertical loads, tall buildings are subjected to lateral loads such as wind and seismic loads. Under the action of wind flow, tall buildings oscillate simultaneously both in the direction of wind and orthogonal to the direction of wind. In some cases even torsional effect may occur. Slender and lightweight modern tall structures, which have less stiffness and damping property, are more sensitive and prone to the dynamic serviceability problems. High-rise buildings are bluff bodies submerged in air flow field, which are subjected to various forces due to pressure and velocity changes. The interaction between wind and tall buildings are the great challenge depends on the exposure type of wind, topography, interference with another buildings, wind direction and geometrical shape of the buildings. In this study, three different building plan area shapes; basic rectangle, single corner-recession and double corner-recession were studied by Computational Fluid Dynamics (CFD). In the simulations k-e turbulence closure model was employed with wind velocity of 26 m/s. The results obtained from the simulation analyses of rectangular shaped plan area building model was compared with a number of widely used codes and showed good agreement. Both the along wind and across wind base shear forces and base bending moments acting on the buildings were observed to be affected from the shape of the plan areas of the models. The values of these forces were noted to be the highest for the basic rectangular shape while they were lowest for the double corner-recession shape. Keywords: Tall Buildings, Wind Effect, Computational Fluid Dynamics, CFD, ANSYS FLUENT