EFFECT OF EFFECTIVE BENDING RIGIDITY IN PUSHOVER ANALYSIS CONSIDERING DIFFERENT CODE APPROACHES

The nonlinear behavior of reinforced concrete (RC) members under seismic loads can be different from predicted design behavior. The cross sectional effective bending rigidity (EI) of these members don’t have same values with design process. This situation is one of the most crucial parameters effected nonlinear performance of RC structures. To define the behavior of cracked section of RC members, there are different approaches in earthquake design codes. These approaches are used to analyze and asses the performance of RC structures. In the study, values of effective bending rigidity (EI) of cracked section given in Eurocode-8, Turkish Seismic code 2007 and new draft Turkish seismic code 2016, are used in a case study of RC structures. The cracked section EI of structural elements on these structures are calculated according to the different design code approaches. They are also evaluated using moment-curvature relationship in Xtract programme. The pushover analysis are applied using all these different values on the different structural types. The base reaction force-top displacement demand, story displacement and drifts, plastic hinge mechanisms obtained from the analysis are compared.