Investigation to Assess Wind Effects on tall Structures by Computational Fluid Dynamics

The tall building is the most dominating symbol of the cities and a human made marvel that defies gravity by reaching to clouds. The development of high strength concrete, higher grade steel, new construction techniques and advanced computational technique has resulted in the emergence of a new generation of tall structures that are flexible, low in damping, slender and light in weight. These types of flexible structures are very sensitive to dynamic wind loads and adversely affect the serviceability and occupant comfort. This project presents the results using Computational Fluid Dynamics Technique using Gambit & Fluent software on square and rectangular building models with an acceptance ratio of 1:1:7 & 1:1.5:7. The wind force on the models is evaluated from force records obtained from software under Computational Fluid Dynamics Technique using Gambit & Fluent for normal wind directions in a sub-urban terrain conditions for category A. The same rectangle building analyzed manually by IS 875 Part 3: 1987. The value obtained from this are compared with software results. The further study is made for the design and calculation of Gust Response Factor.