Title: Parametric Analysis of Reinforced Concrete Columns Under Axial and Shear Loading Using the Finite Element Method

Author(s): C. E. Ignatakis, E. J. Stavrakakis, and G. G. Penelis

Publication: Structural Journal

Volume: 86

Issue: 4

Appears on pages(s): 413-418

Keywords: axial loads; columns (supports); cracking (fracturing); ductility; finite element method; loads (forces); reinforced concrete; shear properties; structural analysis; Structural Research

DOI: 10.14359/2879

Date: 7/1/1989

Abstract:
A finite element computer program (recofin) for the nonlinear behavior of reinforced concrete including crack propagation until failure is presented briefly. A parametric analysis of reinforced concrete columns under combined axial and shear loading using the recofin program gave the following results: 1) There is a critical value of shear-span ratio below which the column fails by diagonal cracking. 2) It is not possible to prevent diagonal cracking by increasing the amount of web reinforcement because the stirrups are suddenly activated together with the start of the diagonal cracking. 3) The failure is very brittle if the stirrups are not adequate to "sew" the diagonal cracking. 4) The increase of web reinforcement gives a small increase in ductility. The results support the conception that short columns must be avoided, especially in constructions at seismic areas, because design procedures have not yet been able to provide adequate ductility.