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RESEARCH ON THE SEMI-RIGID COLUMN BASE OF REINFORCED CONCRETE

The stress state of the structure from external force, mainly depends on the rigidity when the deformation is minimum and depends on the load capacity when it comes to large deformation. The joints of ordinary reinforced concrete buildings are rigid joints, and the bending stress is focused on the column base of the first-floor columns, therefore the cross section of the first-floor columns turn large. Along with this, various problems are considered, such as excessive areas of the cross-section on the upper floors, and complications of the reinforcement, due to disunity of the column cross-sections. Given these backgrounds, semi-rigid column bases were developed to control the bending stress distribution of the columns. In this study, bending shear experiments were conducted in order to understand the structural characteristics of the semi-rigid columns depending on cross-sectional shapes, and the behavior of the semi-rigid columns were confirmed. In addition, semi-rigid column analysis models with various cross-sectional shapes were proposed, and the effective usages of semi-rigid columns with types of cross-sectional shapes were proposed.