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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