Reinforcement Strains in Reinforced Concrete Tensile Members Recorded by Strain Gauges and FBG Sensors: Experimental and Numerical Analysis

Abstract

Experimental and numerical studies have been carried out on reinforced concrete (RC) short tensile specimens. Double pull-out tests employed rectangular RC elements of a length determined not to yield any additional primary cracks. Tests were carried out with tensor strain gauges installed within a specially modified reinforcement bar and, alternatively, with fibre Bragg grating based optical sensors. The aim of this paper is to analyse the different experimental setups regarding obtaining more accurate and reliable reinforcement strain distribution data. Furthermore, reinforcement strain profiles obtained numerically using the stress transfer approach and the Model Code 2010 provided bond-slip model were compared against the experimental results. Accurate knowledge of the relation between the concrete and the embedded reinforcement is necessary and lacking to this day for less scattered and reliable prediction of cracking behaviour of RC elements. The presented experimental strain values enable future research on bond interaction. In addition, few double pull-out test results are published when compared to ordinary bond tests of single pull-out tests with embedded reinforcement. The authors summarize the comparison with observations on experimental setups and discuss the findings.

Crack monitoring in reinforced concrete beams by distributed optical fiber sensors

“…Different configurations to deploy optical fiber sensors in reinforced concrete have been described in the literature, such as attaching the fiber to the concrete surface (Brault & Hoult, 2019b;Grzymski, Trapko, & Musiał, 2019), embedding a jacketed fiber into the concrete (Henault et al, 2012) or attaching the fiber to the reinforcement either by bonding it to the surface (Barrias, Casas, & Villalba, 2017;Brault & Hoult, 2019b) or inserting it into a previously etched groove (Du et al, 2018;Kaklauskas, Sokolov, Ramanauskas, & Jakubovskis, 2019). For crack detection purposes, bonding the fiber directly onto the concrete surface is intuitively the best choice, since large strain concentrations induced by the crack formation can be easily detectable.…”

Deformation Analysis of Reinforced Beams Made of Lightweight Aggregate Concrete

“…The application of performance-based design concepts in advanced structural engineering has increased the integration of alternative numerical methods in the design process of complex modern structures [22,25]. Adequate constitutive models representing the behavior of concrete and reinforcement, as well as their interaction, must be used in the following algorithms [26,27]. Numerous physical models have been proposed for the analysis of conventional reinforced concrete elements [19,[28][29][30].…”

Centriškai tempiamųjų armuoto betono elementų įtempių ir deformacijų būvio analizė

“…Daviklių išdėstymo schema, taikyta Broms (1965) tyrimuose, parodyta 1.21a paveiksle. Panašus daviklių išdėstymas pritaikytas Yannopoulos (1989), Tammo & Thelandersson (2006 bei Kaklauskas et al (2019) armatūros ir betono elemento sukibimo tyrimuose. Pastebėta (1.22 pav.…”