Title: Modeling of Alkali-Silica Reaction-Affected Shear-Critical Reinforced Concrete Structures

Author(s): Anca C. Ferche and Frank J. Vecchio

Publication: Structural Journal

Volume: 119

Issue: 2

Appears on pages(s): 75-88

Keywords: alkali-silica reaction (ASR); beams; direction-dependent mechanical properties; finite element analysis; panels; shear walls

DOI: 10.14359/51734331

Date: 3/1/2022

Abstract:
Analytical procedures for enhanced nonlinear finite element analysis of shear-critical reinforced concrete structures affected by alkali-silica reaction (ASR) are presented. A novel model that addresses the directional variations in the mechanical properties of ASR-affected concrete is developed; in it, the residual mechanical properties are evaluated based on the sustained long-term stress condition and on the severity of the expansion. The proposed model is implemented within a nonlinear finite element analysis program and validation analyses are carried out to examine the accuracy of the methodology proposed, as well as to identify mechanisms that have a significant influence on the analysis of ASR-affected specimens that are prone to brittle failure. It is found that more accurate predictions are obtained when considering directionality in the mechanical properties using the model developed. The results also indicate that for ASR-affected structures in the field, material information from either damaged or undamaged concrete can be used as valuable information for numerical analysis.