A DESIGN FORMULA FOR PREDICTING THE SHEAR STRENGTH OFEXTERIOR BEAM COLUMN JOINTS UNDER SEISMIC LOADING

摘要

The behavior at failure of 50 exterior beam-column joints tested by various authors has been examined toidentify a model for computing the shear strength of exterior beam-column joints under severe seismicactions. This exam has pointed out that, during the cyclic loading, a large diagonal cracking comestogether with a joint volumetric expansion. Three resisting contributions against the above mentionedexpansion have been identified: the concrete one, the beam longitudinal reinforcement one, and the stirrupone. The overall shear strength has been taken as the sum of these three contributions, each dependent ona multiplying factor which has been univocally determined from the available experimental data. The soobtained expression predicts the shear strength in a much more accurate and uniform way than theEurocode, New Zealand and ACI Codes expressions.