Displacement and curvature ductility in mid-rise reinforced concrete buildings

Abstract

When an earthquake occurs, ductility will maintain strength and stiffness in the structure so that the building structure still works even though it is on the verge of collapse. To get a description of the structural behavior starting from the structure in linear elastic, the first yielding of the structural elements until the structure collapse due to earthquake load, it can be done with non-linear static analysis namely pushover analysis. In this study, the geometry of mid-rise reinforced concrete structure consists of four storey buildings. The dimensions of the column structure 400x400 mm and beam structure 250x500 mm, where the dimensions of the beams and columns are the same from the 1st floor to the 4th floor. To find out the behavior that affects the ductility value in mid-rise reinforced concrete structures, a variation material used in this study are the spacing of stirrup, ratio of longitudinal reinforcement, ratio of compressive and tensile longitudinal reinforcement, and compressive strength of concrete. Structural geometry modeling, structural loads, and modeling of material variations used the program SAP 2000. From the output of this program, an analysis of the value of curvature ductility and displacement ductility was performed. The result of this study are the higher the value of compressive strength of concrete and the ratio of longitudinal reinforcement in beam structure will increase the value of ductility. The smaller the value of the spacing of stirrup and the ratio of longitudinal reinforcement in column structure will increase the value of ductility.