Mohamadghasem vetr - Assistance professor international Institute of Earthquake Engineering
Ali ghamri - M.sc student of structure azad islamic univercity-yazd unit
layla hosseinzadeh - PHD student of structure azad islamic univercity-tehran unit

Seismic retrofit of concrete frame by steel shear wall is new method are used because easy fabrication and erection ,high initial stiffness good ductility steel plate lighter than concrete shear wall ect In recent years the advance of steel production has made the new structural steel available The low-yield-Point steel (LYP steel) possesses extremely low yield strength and high elongation properties The LYP steel also possesses low yield ratio which is only 0.34 with low yield ratio the structure is able redistribute the plastic stress and provide large inelastic zone In this paper retrofit of concrete frame by two type of steel (ST37,LYP) and their seismic parameters are considered Result show both system have satisfactory behavior and behavior of system that retrofitted by steel plate is satisfactored and energy absorption overstrength stiffness and shear capacity will increased and yield start from steel plate By using LY steel it is expected from the steel to yield at smaller lateral displacement and the structure to start energy absorption

Concrete Frame Nonlinear Steel shear wall LYP