Effect of Shear Wall Arrangements on Building Frames Constructed in High Seismic Zone

Abstract

The use of dual structural system is recently used by structural Engineer to minimize the hazards towards material and life. The effectiveness of dual system on lateral loads is achieved by combining the advantages of frames and shear walls constituents. Shear wall is added to the building frames to increase its stiffness by bracing the frames these venerable to lateral loads. So, the shear wall should be arranged to the building frames at appropriate position of building frames. Even though the shear wall is purposely proposed for the loads comes in longitudinal direction to shear walls, but the effect on shear wall due to the loads is seen in both directions for this kind of lateral loads. The effect of the loads comes to shear wall in transversal and longitudinal directions of each frame and building is studied in the body of this thesis. To address this study, comparative analysis among the arrangement samples of dual system with moment resisting frames is done using ETABS2016 software. The seismic performance of the dual system and frames is evaluated using non-linear static (pushover analysis) by considering as the model is an existed structure and linear dynamic (Response spectrum analysis method) as new building going to constructed in high seismic zone according to euro codes. Three Buildings (G+5, G+10 and G+20) of shear wall at the axis of different distance from center of mass with three cases at each axis are used to examine the effect of different shear walls arrangement on the whole system and their interaction with frames. Storey drift ratio, base shear, storey displacement and storey stiffness are used to determine the best and worst combination of shear wall and frames. The observation of these results shows that the overall seismic resistance capacity is dependent on the shear wall location in single frames and building. For some models the effect of shear wall on the whole building shows better performance, but single frames combined with shear wall of this model shows local failures and finally it brings the arrangements the worst. Therefore, while design and constructing the building with these kind of arrangements caution should have to be taken during designing of this type of dual system in order to avoid premature collapse of shear wall as some arrangement is dangerous and even adverse the advantages of shear wall.