Analysis of RC slab-beam-column sub-assemblages subjected to bidirectional lateral cyclic loading using a new 3D macroelement

摘要

An existing two-dimensional macroelement for reinforced concrete beam-column joints is extended to a three-dimensional macroelement. The three-dimensional macroelement for beam-column joints consists of six rigid interface plates and uniaxial springs for concrete, steel, and bond-slip, which model the inside of a beam-column joint. The mechanical models for the materials and the stiffness equation for the springs are also presented. To validate the model, we used test results from three slab-beam-column sub-assemblages subjected to bi-lateral cyclic load. It is revealed that the new joint model is capable of capturing the strength of beam-column joints and the bidirectional interaction in joint shear response, including the concentration of damage in the beam-column joint, the pinching nature in hysteretic behavior, the stiffness degradation, and strength deterioration resulting from cyclic and bidirectional loading. Copyright (C) 2017 John Wiley & Sons, Ltd.