A Computational Study of the Shear Behavior of Reinforced Concrete Beams Affected from Alkali-Silica Reactivity Damage.

Bora Gencturk,Mohammad Hanifehzadeh,Clotilde Chambreuil,Hadi Aryan,Jianqiang Wei

doi:10.3390/ma14123346

Abstract

In this study, an investigation of the shear behavior of full-scale reinforced concrete (RC) beams affected from alkali–silica reactivity damage is presented. A detailed finite element model (FEM) was developed and validated with data obtained from the experiments using several metrics, including a force–deformation curve, rebar strains, and crack maps and width. The validated FEM was used in a parametric study to investigate the potential impact of alkali–silica reactivity (ASR) degradation on the shear capacity of the beam. Degradations of concrete mechanical properties were correlated with ASR expansion using material test data and implemented in the FEM for different expansions. The finite element (FE) analysis provided a better understanding of the failure mechanism of ASR-affected RC beam and degradation in the capacity as a function of the ASR expansion. The parametric study using the FEM showed 6%, 19%, and 25% reduction in the shear capacity of the beam, respectively, affected from 0.2%, 0.4%, and 0.6% of ASR-induced expansion.

Highlights

The durability of concrete is an important consideration for reinforced concrete (RC) structures
alkali–silica reaction (ASR) degradation has been implemented in lattice discrete particle models (LDPM), which can simulate the heterogenous nature of concrete at the coarse aggregate scale
This study aims to fill this gap of scarce data and analysis on the shear capacity of ASR-damaged beams

Summary

Introduction

The durability of concrete is an important consideration for reinforced concrete (RC) structures. The test results showed that the crack distribution and moment capacity of the beams were affected by ASR and the beams failed in flexure under three-point bending but the prestressing effect of the ASR-induced expansion compensates for degraded concrete properties. The results of two full-scale shear tests on a RC beam have been presented in terms of maximum shear capacity, crack maps and widths, and strains in the Materials 2021, 14, 3346 reinforcement. The results from the second shear test in which the beam was pushed to ultimate strength and failure have been used to validate a finite element model (FEM), which was later used to simulate the long-term structural behavior of the beam affected from ASR. The reduction in the shear capacity of the beam was predicted as a function of the concrete ASR expansion

Literature Synthesis

Literature

Literature TLhitisersatutudrye This study

Geometry

Findings

Model Validation