Author(s)

K. Jaafar & C. Morley

Abstract

Seismic behavior of rectangular concrete beams with spirals near potential plastic hinges K. Jaafar & C. Morley University of Cambridge, Department of Engineering Abstract From observation of performance in earthquakes, the Strong Colurnn/Weak Beam concept has now become fairly standard. This requires an increase in the column size relative to the beams, and more attention to reinforcement detailing [I]. The intention is that under strong lateral earthquake motion, plastic hinges form in the beams adjacent to the column. The hinges at the beam-ends will be subjected to severe cracking and damage during the earthquake. The question then arises whether the damaged hinge zone will retain enough shear strength to hold up the beams and the floors after the earthquake. The end hinge zones, having been bent well into the failure region both ways, will be cracked right through top to bottom, and concrete may well have spalled away from both faces when under compression. Also the rebars may well have bu

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