Fiber Beam-Column Element-Based Numerical Model for Elastoplastic Performance Analysis of Column
Based on the OpenSees platform,a finite element model consisting of displacement-based beam-column elements and zero-length elements is developed for cyclic pushover analysis of columns,considering the plastic flexural deformation and bond-slip effect.The influence of the element length for the plastic region on the elastoplastic performance of columns is analyzed,and the reasonable element length is discussed.Finally,the numerical model is validated based on the quasi-static tests of three reinforced concrete cantilever columns with flexural failures in the PEER structural test database.The results show that the length of the displacement-based beam-column element in the plastic region has significant effects on the horizontal strength and displacement ductility of the column.The reasonable element length should be equal to the equivalent plastic hinge length,which can be calculated using the empirical formula proposed by Priestley et al.
reinforced concrete columnelastoplastic performancedisplacement-based beam-column elementelement length for plastic regionequivalent plastic hinge length
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