Abstract
The purpose of this study is to investigate the amount of rebar reinforcement at corner joints in reinforced concrete structures. As the use of reinforced concrete increases, the use of various types of joints is increasing. Since reinforced concrete corner joints determines the structural performance, research on rebar contents is very important. The current standard design calculation formula of rebar amount is not influenced by geometric shape of corner joint and rigidity ratio of steel. The equations of current standard was a translation of Japanese highway design standards and is different from the US ACI regulations. This study presents a more reasonable design criteria by analyzing the stress distribution through a simple truss model. The effective stiffening efficiency of the stiffener and flexural reinforcement of the corner joint of the box structure was evaluated by comparing with the FEM analysis. As a result of the analysis, it is structurally advantageous to install the hunch, and it is considered that the current design standard which regards the contribution of the rebar as 50 % is not reasonable.
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