DEVELOPMENT OF HIGH STRENGTH REINFORCED CONCRETE FLAT BEAM SYSTEM

RC flat beam system, which was rigid frame construction that consisted with RC flat beams and normal RC columns, were researched and developed in the previous study by the authors. The flat beam of this system has wider width than columns have and shorter depth than normal beams have. In this study, high strength RC was used for the flat beam system. In order to investigate performance of high strength RC flat beam system, cyclic loading tests of two beam-column joint specimens were carried out, which one is cruciform joint specimen, the other is corner joint specimen. As results, it can be said that there were no serious problem in this system. All the specimens showed restoring force characteristics of flexural type, and flexural strength could be estimated by traditional ways. An estimating method of stiffness of RC flat beam and column joint was shown in this paper.