The Structural Engineer > Archive > Volume 71 (1993) > Issues > Issue 8 > Behaviour of Beam-Column Joints in Seismically-Loaded RC Frames
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Behaviour of Beam-Column Joints in Seismically-Loaded RC Frames

The behaviour of beam-column joints is discussed in the context of current design procedures for reinforced concrete ductile frames subjected to severe earthquake motions. As plastic hinges are expected to develop in beams, the beamcolumn joints must be capable of transferring large shear forces across the joint cores. The mechanisms of shear resistance of joint cores comprise a diagonal concrete strut mechanism and a truss mechanism. A considerable amount of joint core shear reinforcement is necessary to sustain the truss mechanism if bond failure of longitudinal bars is avoided. The diameter of longitudinal beam reinforcement in joint cores needs to be restricted to ensure adequate anchorage in joint cores. The significant differences in detailing requirements of beam-column joints that exist between various concrete design Codes led to an international collaborative research project involving the testing of full-scale beam-column-slab joint subassemblages under quasi-static cyclic loading. The three subassemblages designed to New Zealand practice performed very well. P.C. Cheung, Professor T. Paulay and Professor R. Park

Author(s): Cheung, PC;Paulay, T;Park, R

Keywords: beams;columns;connections;behaviour;design;reinforced concrete;frames;earthquake loads;;codes of practice;shear strength;new zealand;slabs;bending movements;randd;anchorages;load tests;reinforcement;floors