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Abstract
Reinforced concrete frames frequently suffer severe damage under strong earthquakes, and the damage is often concentrated at beam-column joints. This paper presents the experimental and analytical findings of the seismic performance of reinforced glazed hollow bead insulation concrete (GIC) interior beam-column joints. Six 1/2-scale GIC interior beam-column joint specimens were tested under quasi-static cyclic loading to measure the failure pattern, hysteresis curves, displacement ductility, energy dissipation and stiffness degeneration. Seismic behavior of GIC joints was investigated to elucidate the influence of concrete type, axial compressive ratio and stirrup ratio on the joint panel. A “three-stage” model was proposed to calculate the shear strength of GIC joints by combining the diagonal compression strut mechanism and the truss mechanism. Nonlinear finite-element analysis of joints was performed to examine the validity of the “three-stage” calculation model by comparing the results with the experimental results.
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