Title: Extent of Plasticity in Reinforced Concrete Columns

Author(s): Gabriele Guerrini and José I. Restrepo

Publication: Structural Journal

Volume: 115

Issue: 5

Appears on pages(s): 1219-1230

Keywords: column; diagonal compression field; ductility; extent of plasticity; flexure-shear interaction; plastic hinge; reinforced concrete; seismic design; spread of plasticity

DOI: 10.14359/51702245

Date: 9/1/2018

Abstract:
This paper discusses a method to determine the extent of plasticity at the ends of laterally loaded ductile reinforced concrete columns where plastic hinges form, and where transverse reinforcement is detailed to ensure ductility. Current code formulations are shown to generally underestimate the extent of this region. An analytical method is derived that combines flexural analysis of the column with flexure-shear interaction considerations. The analytical method is compared to the experimental results from tests on reinforced concrete columns conducted over the last 30 years, showing good agreement. The paper concludes with simple recommendations for use in design.