Abstract
As the fourth part of five serial reports, the characteristics of earthquake response of reinforced concrete frames obtained by the On-line simulation and the computer simulation reproted in the previous papers are examined in detail mainly on the following items; a) skeleton curve under monotonic loading, b) development of cracks, c) shear force-displacement relationships during earthquake response, d) time history of shear force and displacement, e) relationships between maximum response displacement and lateral strength and/or initial natural period and f) comparison between the On-line simulation and the computer simulation.