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Buildings with irregularity in plan floors appears to be more susceptible to large deformations and damage when they are subjected to strong ground motion than those with regular plan floors due to the additional accidental torsional forces resulting from the existing eccentricity between the center of mass and center of rigidity of the resisting elements. The evaluation of seismic response of irregular buildings in plan is required in order to determine the seismic level of protection afforded to these buildings by new design provisions which have been introduced to Egyptian code (ECOL201)[15]. Therefore it is intended in the present study to evaluate the performance of gravity loaded irregular buildings in plan under earthquake excitation. The structural irregularities in plan were represented by ten irregular configurations to cover and model the torsional effects. A time history analysis with a peak ground acceleration of 0.25g was carried out for these ten models using finite element program SAP2000[16]. The numerical studies for different configurations of irregularity effect were clear in T- plan shape than others. The base shear induced in the perpendicular direction ranged between 40% and 80% of the base shear in the direction of the motion. The results declared the necessity of executing structural separation in these irregular buildings in plan to minimize the induced perpendicular base shear. Many conclusions are deduced and they are believed to be very helpful to the structural engineer in order to improve the knowledge of the subject and to avoid unintended consequences of ECOL.

INFLUENCE OF STRUCTURAL IRREGULARITY IN PLAN FLOOR SHAPE ON SEISMIC RESPONSE OF BUILDINGS