STUDY ON OPTIMUM YIELD SEISMIC COEFFICIENT FOR DESIGN OF REINFORCED CONCRETE STRUCTURES BASED ON PROBABILITY THEORY

The purpose of this study is to determine an optimum yield seismic coefficient based on probability theory. RC structures are represented by a single-degree-of-freedom system with a degrading tri-linear model. Yield seismic coefficient and yield period are chosen as structural parameters, which are treated as deterministic. Frequency and magnitude of earthquake, attenuation equation and reflection of local site condition are considered to involve uncertainties. Ductility factor is taken as a measure for damage of structures. Dynamic analysis is performed on each set of structural parameters to obtain ductility factor. Then optimum yield seismic coefficient is determined so as to minimize expected total cost.