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Title: Nonlinear Cyclic Truss Model for Reinforced Concrete Walls

Author(s): Marios Panagiotou, Jose I. Restrepo, Matthew Schoettler, and Geonwoo Kim

Publication: Structural Journal

Volume: 109

Issue: 2

Appears on pages(s): 205-214

Keywords: cyclic; nonlinear; shear-flexure interaction; size effects; structural walls; truss model

DOI: 10.14359/51683631

Date: 3/1/2012

This study describes a nonlinear truss modeling approach for reinforced concrete (RC) walls or, in general, for plane stress RC elements subjected to cyclic reversals. Nonlinear vertical, horizontal, and diagonal truss elements are used to represent concrete and steel reinforcement. The flexure-shear interaction (FSI) is intrinsically modeled herein. The model captures the strain histories in the reinforcement and concrete and accounts for the dependency of the concrete stress-strain relationship in compression on the transverse strain, including stiffness and strength degradation. The model also considers mesh size effects. The capabilities of the model are demonstrated by comparing the measured and computed cyclic responses of three test walls that displayed significant FSI, including a six-story wall with openings.