EFFECT OF SHEAR WALL’S ECCENTRICITY ON THE SEISMIC PERFORMANCE OF RC DUAL SYSTEM

Reinforced concrete (RC) structural walls are effective for resisting lateral loads induced by earthquakes on building structures. They provide substantial strength and stiffness as well as deformation capacity needed to meet the demands of strong ground motions. In some cases because of architectural limitations and form-work difficulties, the shear walls are constructed with an eccentricity with respect to the frame axis. The provision of shear wall’s eccentricity may be needed for strengthening of existing building. However, most of the RC code of practices such as ACI318-05 and Iranian concrete code (ABA) have no recommendation(s) and/or limitations concerning this eccentricity. In this paper the effect of Shear Wall's eccentricity on the seismic performance of RC dual system is studied. For this purpose, three two-dimensional (2D) frames with 6, 9 and 12 stories were selected from three-dimensional (3D) buildings, which were analyzed and designed according to the third edition of Iranianstandard 2800 and the Iranian concrete code of practice (ABA). The nonlinear static analysis carried out for three different eccentricities utilizing various load patterns. ABAQUS finite element program is used for nonlinear static analysis. The result indicate that by increasing the eccentricity, the torsional moment of boundary elements and the on plane bending of shear wall severely increase. Also shear wall's eccentricity has no significant effect on behaviour of RC dual frame.

کلیدواژه ها:

RC Shear Wall ، Nonlinear Static Analysis ، Eccentricity ، Seismic Performance