Experimental and Numerical Analysis of Strain Gradient in Tensile Concrete Prisms Reinforced with Multiple Bars

TL;DR

This study investigates the strain distribution in reinforced concrete prisms with multiple bars under tension, using experimental tests and finite element modeling to improve understanding of deformation behavior for better structural design.

Contribution

It introduces a new test methodology and modeling approach for analyzing strain gradients in concrete with multiple reinforcement bars, addressing limitations of traditional methods.

Findings

Concrete deformation varies with reinforcement configuration.

Finite element analysis effectively models strain distribution.

Concrete tension efficiency impacts structural design considerations.

Abstract

This work is a continuation of the ongoing research on deformation behavior of reinforced concrete elements under tension. The previous studies have revealed that deformation behaviors of elements reinforced with multiple bars and the traditional prismatic members reinforced with a center bar are essentially different. The latter layout, though typical of laboratory specimens, could not represent the norm of structures in real-life. Thus, a new test methodology to investigate the strain distribution in concrete prismatic members reinforced with multiple bars subjected to axial tension is devised. Prismatic concrete specimens with different reinforcement configurations were fabricated and tested using the proposed setup. Deformation behavior of the specimens is modeled with a tailor-designed bond modeling approach for rigorous finite element analysis. It is revealed that the average deformations of the concrete could be different from the prevailing approach of average deformations of the steel, and are dependent on the reinforcement configurations. Therefore, the efficiency of concrete in tension should be carefully taken into account for rational design of structural elements. The study endorses promising abilities of finite element technique as a versatile analysis tool whose full potential is to be revealed with the advent of computer hardware.