Fereshteh Mousavi Raad, Taleb Moradi Shaghaghi


Abstract. One method of improvement and safeguarding the ductility is making use of seismic base isolation system. Seismic isolation system effectively isolates the building from the horizontal components of earthquake. The shear walls at the side of the moment frames can provide for a soft, resistant and ductile behavior of the whole building and toleration of the highest quotient of the base shear force that brings about a considerable increase in the building’s stiffness and a notable decrease in the damage to the nonstructural elements. The main objective of the present study
is the investigation of the seismic behavior of the isolated concrete buildings and comparison of the results with those obtained for fixed base structures. The study’s goal is actualized through nonlinear dynamic analyses using far and near-fault earthquake accelerographs assisted by ETABS V 9.6.0 and REFORM 3D software. The present study considers three seven-storey, twelve-storey and twenty-storey (representing short-, medium- and high-rise) structures featuring moment frame dual system with shear walls along the x- and y-axes and designs a lead-rubber base isolation system for them. On the other hand, the structure responses, including the floors’ relative displacements, floors’ shear
forces and the components’ internal forces have to also be made clear. The use of isolation systems in seven-storey and twelve-storey structures led to the reduction of responses and improvement of the structure behavior. As for the high-rise buildings with high alternating periods, the addition of isolation systems causes an increase in the structures’ responses.
Keywords: concrete buildings with shear walls, lead-rubber bearings, time history analysis, near- and far-fault earthquake

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