COMPARATIVE RESPONSE ANALYSIS OF BUILDINGS WITH AND WITHOUT BRACING UNDER WIND LOAD EFFECT

Abstract

In the present era, the trend in construction industries is more inclined towards tall building i.e. vertical expansion of the building, due to the scarcity of land available and increasing population. The cost of the building increases as the height of the building increases due to the increase in the weight of the building and forces. As the height of the building increases, lateral movement of the building also increases (sway).To reduce the sway one of the techniques used is ‘bracing’. There are many types of bracings normally used in the practice such as x-bracing, v-bracing, inverted v-bracing, eccentric bracing, k-bracing etc. Also these bracing can be provided at different positions in the buildings. In the present study, 20 storey steel structure of height 60m (3 m each storey) was considered. The structure was designed as per IS 800:2007 code with dead load, live load and wind load combinations. Static analysis was performed using E-tabs software assuming, importance factor as 1.15, Terrain category IV and Topography to be flat. The analysis was performed according to IS 875:2015. The analysis was performed for buildings of two plan shapes, square and plus shape, with x-bracing, v-bracing, inverted vbracing, diagonal bracing, k-bracing and without bracing. The results were compared and studied. It was found that the lateral response of the structure was more in the structure without bracing than other models. It was also observed that lateral loads were more in the case of Xbracing. Finally, it can be concluded that Inverted V-bracing is better for wind loading.