Inelastic displacement ratio for elastoplastic systems

The principle of earthquake resistant design is emerged to prevent earthquake loss. As a result of scientific studies, coming out of this approach has developed in current design codes likewise TERDC (Turkish Earthquake Resistant Design Code) 2007.The general principle of earthquake resistant design in accordance with TERDC 2007 is to prevent structural and non-structural elements of buildings from any damage in low-intensity earthquakes, to limit the damage in structural and non-structural elements to repairable levels in medium-intensity earthquakes, and to prevent the overall or partial collapse of building in high-intensity earthquakes in order to avoid the loss of life.The expected performance of buildings is as can be seen from this statement, under the design earthquake (10 % probability of exceedance in 50 years) to provide life safety demand. This idea has given favorable results related to design aims. Although this approach is reached the expected design requirements still have some deficiencies within. Especially even the building which designed and built in accordance with current seismic codes, performance evaluation is very difficult to estimate under the design eartquake. Different methods are proposed to predict the lateral displacements in case of strong eartquakes. Therefore many researchers proposed emprical equations to predict inelastic displacement demands especially in elastoplastic systems during an eartquake ground motion.In this study, inelastic displacement ratios of elastoplastic single-degree-of-systems are examined by using with strength reduction factor (R). The results obtained using the proposed correlation for the prediction of inelastic displacement ratio.