Abstract: (6036 Views)
Abstract
Earthquake reconnaissance has identified shear failure of reinforced concrete columns as a primary cause of
failure of older existing reinforced concrete columns. Satisfactory seismic response of reinforced concrete
columns requires that brittle failure modes be inhibited. In this research, different factors which affect the shear
failure of columns have been studied, and then by using the results of 103 cyclic loading tests on columns, a new
model for estimation of shear strength degradation under cyclic loading has been developed. The proposed
model can be used to estimate shear strength degradation of reinforced concrete columns with shear, shear
flexural and flexural failure separately. Uncertainty of the results of this model is little because the study has
been concentrated on the three independent groups of the columns with one specified failure mode. The results
of cyclic loading tests used in this study have been taken from the PEER ( Pacific Earthquake Engineering
Research Center) database.
Received: 2007/06/6 | Accepted: 2009/02/4 | Published: 2011/03/7