The Effects of Stiffness Alteration of the 1st Floor in the Concrete Precast 3D Panel System Supported on RC Frames on its Seismic Responses

In the present study, the effects of alteration 1st floor’s stiffness of the concrete precast 3D panel system supported on RC frames on its seismic responses are described. In order to do this study, numerical analysis of two models of four-story building by using 3D wall system in three upper floors and using concrete frame system at the parking level, with different 1st floor’s stiffness is carried out by ANSYS soft ware under seismic motion. Through this analysis, dynamic responses of two models such as story drift, story rotation, story shear force and energy absorbed by each story under seismic motion, are investigated. In addition, the quality of tensile stress in the reinforcement of the RC frame in first floor and also quality of generated cracks in concrete frame are estimated.