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Abstract There is a strong relationship between the architectural design and the earthquake safety of the building. So architects are advised to design regular and symmetric structures, that if the distribution of floor masses and the distribution of load- resisting elements are not symmetric with respect to some orthogonal axes, the buildings are considered asymmetric. This study aims to investigate the effect of shear wall arrangement, and the shear wall thickness, and the different ground accelerations on the performance of asymmetric plan structures to seismic loads. A twenty story asymmetric plan structure with four openings in its floor slab is analyzed under seismic loads. Eight models are investigated where the differences between them were according to location and arrangements of shear walls and the places of the opening. The software used here is ETABS program. Thirty five earthquake records were used as ground accelerations The thickness of shear walls was changed from 0.25 to 0.60 m 25 0.3, 0.4, 0.5, and 0.60) to get the effect of these increments on the performance of the structure. As a result of the proposed study, it is concluded that plans which have shear walls allocated on the outer edges behave more acceptable than that haven’t shear walls on the outer edges where the first ones have minimum displacements and minimum interstory drifts. The increasing in shear wall thickness decreases the displacement of the top story as so as the interstory drift while it increases the torsion and base shear. As an exception for some earthquakes the increment in shear wall thickness causes increment in top story displacement due to the adjacent of the structure fundamental frequency and frequency content of these earthquakes. A comparison is carried out between the results produced |