Analysis and Comparative study of Lateral Load Resisting System in High Rise Building
D P Nithin1, Gangadhara S2
1Mtech (Structure), Department of Civil Engineering & Bangalore Institute of Technology
2Assistant Professor & Department of Civil Engineering & Bangalore Institute of Technology
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Abstract -Generally, Moment resisting frames (MRF) are known for their load resisting behavior (gravity loads). As the building height increases, the effect of lateral force on the structure also increases. MRF alone is not able to resist those lateral loads in region of higher seismic zones. In order to resist these lateral actions, lateral load resisting systems (LLRS) are very significant in tall buildings. In the analysis of tall buildings, the suitability of analysis method is very important. Stiffness is very crucial in controlling global displacement in high rise buildings. The lateral load resisting systems like shear wall, bracing systems plays a very important role in reducing the drift, displacement, story shear and also, they increase the stiffness of the building. The positioning of the structural systems plays important role in reducing the effects. In this project, G+20 building is considered and comparative study of shear wall systems with and without opening and different types of bracing systems are analyzed by response spectrum method using ETABS software. From results, we found that models with lateral load resisting system plays important role in reducing drift and storey displacement. With the presence of opening in the shear wall slightly increase story drift and displacement at stories. The model with LLRS placed at central position adds more stiffness compared to positioning at corner.
Keywords - Moment resisting frames, drift; displacement; storey shear; storey stiffness; Lateral load resisting systems; shear wall; bracings; Etabs.
