In this paper, the accurate response of reinforced concrete buildings by the equivalent linearization technique, where the damping factor is given by thc function of ductility, is simply shown by the independent seismic factors of the seismic spectrum and the independent structural factors of a building. Then, the effects of the factors such as building height, base shear coefficient, ductility factor, etc. on thc seismic performance of buildings are examined, and simple equations in order to evaluate the seismic performance level are induced. Finally, the seismic performance levels required by two calculation methods, which are capacity-based design method and calculation of allowable stress, etc., specified in current Building Standard Law Enforcement Order, are discussed.
