Three-Dimensional FEM Analysis of RC Beam-Column Joints Subjected to Two-Directional Loads

This paper describes how seismic design provisions for beam-column joints in the Architectural Institute of Japan (AIJ) guidelines are based mainly on earlier experimental studies. However, it is necessary to establish a more rational, performance-based design method, especially for joints that are subjected to two directional seismic forces. This can be accomplished by analytical study of the stress transfer mechanisms in joints. In order to understand the progression of damage in joint concrete, accumulated absorbed strain energy for concrete and reinforcement was calculated from the results of finite element method (FEM) analysis. The stress transfer mechanisms and progression of damage in concrete and reinforcement provide a basis for establishing a more rational, performance-based design method for RC structures.