الفهرس 
IntroductionOnly 14 pages are availabe for public view
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Abstract
The mitigation of the dynamic response of buildings and structures subjected to earthquakes is one of the fundamental aims of modern designs. This study investigates the response of the building to earthquakes after applying reliable dampers. In the present study, the seismic performance of a 119.90 m high rise tower, with three basements in Qatar is examined. The numerical model of the building is created and its performance under four major earthquakes is studied. A dynamic analysis model is carried out to obtain the responses of the building, with damper and the building without damper in terms of displacement, acceleration, stresses and base shear at all floors in order to evaluate the effectiveness of the damping system in mitigation of the seismic response.Finite element techniques are used to model the dampers and the structures using SAP 2000 software. Time history analysis is applied to investigate the effects on building. Measures of judging the robustness of the system is to reduce top building displacement, top building acceleration, core stresses and base shear. The different variants are earthquake time histories, location of dampers and dampers configurations. Three different damping configurations and tuned mass damper are mounted on the building`s mechanical floors. The results have proved that the best type of dampers which gives the optimum results, which reduce the maximum response, is x-bracing damper. Top displacement, top acceleration, stresses and base shear have shown that x-bracing damper is capable of achieving seismic mitigation, under all types of earthquakes, for all structures considered in this study. The results also provide information which can be used for optimal damper placement for seismic mitigation. The outcome of the study and recommendations for future work are presented in the last chapter of this thesis.