Seismic damage analysis including inelastic shear–flexure interaction |
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| Authors: | Panagiotis E Mergos Andreas J Kappos |
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| Institution: | (1) Department of Civil Engineering, University of Patras, P.O. Box 1424, 26504 Patras, Greece; |
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| Abstract: | The paper focusses on seismic damage analysis of reinforced concrete (R/C) members, accounting for shear–flexure interaction
in the inelastic range. A finite element of the beam-column type recently proposed by the writers for the seismic analysis
of R/C structures is first briefly described. The analytical model consists of two distributed flexibility sub-elements which
interact throughout the analysis to simulate inelastic flexural and shear response. The finite element accounts for shear
strength degradation with inelastic curvature demand, as well as coupling between inelastic flexural and shear deformations
after flexural yielding. Based on this model, a seismic damage index is proposed taking into account both inelastic flexural
and shear deformations, as well as their interaction. The finite element and the seismic damage index are used to analyse
the response of R/C columns tested under cyclic loading and failing either in shear or in flexure. It is shown that the analytical
model and damage index can predict and describe well the hysteretic response of R/C columns with different types of failure. |
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