Abstract
A semi-empirical method was developed to estimate lateral displacements of flexure-dominant rectangular RC columns at a number of key seismic damage states. The principal damage states studied here include yielding, crushing of concrete cover, significant concrete spalling, buckling of longitudinal bar, and ultimate limit state. At first, the expressions were derived to estimate the compression zone depth of column section by regression analysis on the results obtained from moment-curvature analysis. Secondly, the strain of the extreme compression fiber of the gross section at the onset of concrete cover crushing and that of the confined core section at significant concrete spalling, longitudinal bar buckling, and ultimate limit state individually were derived on the basis of the plane-section hypothesis, plastic-hinge method, and statistical analysis on the database containing the results of cyclic tests on RC columns assembled at the Pacific Earthquake Engineering Research Center. Then the lateral displacement at individual damage state could be obtained by plastic-hinge analysis accordingly. The proposed method can be used as the basis for displacement-based seismic design and damage evaluation for flexure-dominant RC columns.
Published Version
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