Compression Field Modeling of Reinforced Concrete Subjected to Revered Loading: Verification

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Title: Compression Field Modeling of Reinforced Concrete Subjected to Revered Loading: Verification

Author(s): Daniel Palermo and Frank J. Vecchio

Publication: Structural Journal

Volume: 101

Issue: 2

Appears on pages(s): 155-164

Keywords: cracks; loads; walls

Date: 3/1/2004

Abstract:
General constitutive models for reinforced concrete subjected to reversed cyclic loading were recently developed for use in two-dimensional nonlinear finite element analyses, based on the smeared rotating crack assumption. The algorithm adopted was based on a total-load secant stiffness approach incorporating the compatibility, equilibrium, and constitutive relationships of the Modified Compression Field Theory (MCFT). Herein, verification is provided through analyses that include slender walls, which are controlled by flexural effects, and squat walls, where the response is dominated by shear-related mechanisms. The formulations are found to accurately simulate the behavior of structural walls, demonstrating that a secant stiffness procedure can effectively be adapted to model response to general loading. Behavioral aspects such as ultimate strength, ductility, energy dissipation, and failure mechanisms are well simulated. Second-order mechanisms are also examined and discussed, including the vertical elongation of flange walls and the in-plane horizontal expansion of central web walls, which affect the failure load and failure modes of structures. Shortcomings of the compression field approach are also addressed.