DETERMINING MOMENT-CURVATURE RELATIONSHIP OF REINFORCED CONCRETE COLUMNS

Abstract

Determining the behavior of reinforced concrete (RC)members is crucial in RC structures. The nonlinear attributes of RC members aredefined according to the cross sectional behavior of RC members to evaluate theperformance of structures. To be able to determine cross sectional behavior ofRC members, moment-curvature relationship should be known well. In the RC structures, using moment-curvature(MC) relationship is the best way to represent cross sectional behavior andnonlinear properties of RC members. The MC relationship of RC cross sectionscan be evaluated by both experimentally or numerically. Some experimentalstudies on RC members which are applied with 1:1 scale can be difficult todefine moment-curvature relationship. The purpose of the study is to obtain theMC relationship of RC rectangular and circularand circular columns numerically. By the way this study is tried toachieve determining the parameters which affect MC relationship of RC members.In the study, to evaluate MC relationship of RC members XTRACT programme whichrepresents influentially MC relationship is used. Compressive strength ofconcrete, axial load on the RC sections, longitudinal and transversereinforcing ratio, are selected as comparison parameters which affect MC relationship.As a consequence of this study curvature ductility and effective flexuralstiffness of RC rectangular and circular sections are determined using theseparameters. Effective flexural stiffnessis compared with the values defined in design codes. As a result of comparison,it is observed that the moment curvature relationship can be defined as aformulation according to the parameters which affect directly.