Compression Field Analysis of Fiber-Reinforced Concrete Based on the Cracked Membrane Model

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Title: Compression Field Analysis of Fiber-Reinforced Concrete Based on the Cracked Membrane Model

Author(s): Walter Kaufmann, Jaime Mata-Falcón, and Ali Amin

Publication: Structural Journal

Volume: 116

Issue: 5

Appears on pages(s): 213-224

Keywords: compression field approaches; fiber-reinforced concrete; in-plane shear and normal forces; load-deformation analysis; plane stress; shear strength

Date: 9/1/2019

Abstract:
Compression field approaches are well-established methods used to analyze the load-deformation behavior of reinforced concrete elements subjected to in-plane shear and normal forces. In this paper, the simplified Cracked Membrane Model, considering rotating, stress-free cracks, is extended to include the effect of fiber reinforcement. The key advantage of the proposed compression field approach is that it yields the most important factors for the design and analysis of fiber-reinforced concrete (FRC)—that is, crack opening and spacing—directly. A solution procedure is developed herein for two practical design cases for webs of girders without conventional shear reinforcement. In both cases, the applied load can typically be increased after cracking even when using strain softening FRC. The model is shown to predict the response of available test data on uniaxially reinforced FRC panels satisfactorily, but fails to capture failures governed by sliding of cracks in elements containing high fiber dosages.