Influence of the Modulus of Elasticity of CFRPs on the Compressive Behavior of Confined Test Pieces and on the Flexural Behavior of Short Concrete Beams

Daniela Brizuela Valenzuela,María De Las Nieves González García,Alfonso Cobo Escamilla

doi:10.3390/app11020491

Daniela Brizuela Valenzuela, María De Las Nieves González García + Show 1 more

Open Access

https://doi.org/10.3390/app11020491

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Abstract

In this study, we compare the behavior of confined compression-tested concrete test pieces and short concrete beams subjected to three-point flexural strength testing when they are reinforced with high-modulus, high-strength carbon fibers reinforced polymers (CFRP). The fabrics used have roughly the same mechanical capacity but very different rigidities. As such, the results make it possible to obtain the influence of the rigidity of the CFRP on the structural behavior of the elements tested. The results obtained show that the type of fabric used does not cause significant differences in the values of tension of rupture and the form of rupture of the test pieces subjected to compression and flexural strength testing, which suggests that the variable which determines the mechanical response of the elements which have been reinforced and subjected to these kinds of demands is the mechanical capacity of the reinforcement, not its rigidity.

Highlights

The rehabilitation of reinforced concrete structures (RCS) is an activity that is on the rise worldwide
We compare the behavior of confined compression-tested concrete test pieces and short concrete beams subjected to three-point flexural strength testing when they are reinforced with high-modulus, high-strength carbon fibers reinforced polymers (CFRP)
The fracture was preceded by a loud crackingdue sound the fracturing of fibers throughout the length of the test piece, in the test pieces reinforced before the fiber snapped

Summary

Introduction

The rehabilitation of reinforced concrete structures (RCS) is an activity that is on the rise worldwide. It is often necessary to increase the resilience of RCS owing to changes in use which imply greater loads, structural interventions in order to install new openings, or pathological problems. The use of composite materials made of fiber-reinforced polymers (FRP) started at the end of the Second World War in applications such as aviation, and at the end of the 1980s, their use reached the construction and infrastructures sector [2]. The first research project to investigate the option of using materials composed of FRP to reinforce concrete structures dates back to the year 1978 in Germany [3]. The first practical applications took place in Switzerland, in order to increase the bearing capacity on bending of reinforced concrete bridges [4,5]

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