ANALYSIS OF INDUSTRIAL STEEL STRUCTURE BY USING BRACING AND DAMPER UNDER THE WIND LOAD AND EARTHQUAKE LOAD

Abstract

Following the recent trends of earthquake all over the world, it is observed that there is very high risk for earthquake, thus creating a need of earthquake resistant structure. The tall structures are prone to the seismic load and wind load. For this purpose of enhancing the stiffness and reducing lateral displacement there are various methods to resist these lateral loads like base isolation, formation of hollow foundations, tuned mass dampers, horizontal bands and bracings. Among these application, bracing is one of the best methods to resist these kinds of loads. Bracing can be applied concentrically or eccentrically. The cross bracings are one of the mostly used types of bracing. Bracings are very efficient in overcoming the elastic seismic waves. This is used for strengthening the building by increasing its stiffness and displacement capacity keeping the lateral displacement as low as possible. Various types of bracings can be used like X, V and Inverted V etc. An attempt has been made to study the reduction in responses of a structure under lateral loading due to the incorporation of different bracing systems. In this study a G+20 building structure of plan area 10.5m X 9m is analysed under earthquake load in zone IV by placing different bracing systems at different locations. The analysis is performed in ETABS by using response spectrum method. The bracing systems considered are inverted V, V and X bracings. These bracings are placed at center and outer bays of the building. From the analysis of the buildings with different bracings storey displacements, storey drifts, storey shears and overturning moments are evaluated. These results are evaluated for the load combination(1.2DL+1.2LL+1.2EQ X). Due to the effect of seismic loading a building normally experiences lateral as well as torsional displacement under seismic loading. Bracing system in any form increases the overall stiffness of the system and hence acts as a control mechanism for both lateral and torsional movement of the structure.

(1.2DL+1.2LL+1.2EQ X). Due to the effect of seismic loading a building normally experiences lateral as well as torsional displacement under seismic loading. Bracing system in any form increases the overall stiffness of the system and hence acts as a control mechanism for both lateral and torsional movement of the structure.