Performance of hemp-FRCM-strengthened beam subjected to cyclic loads

L.  Mercedes; V.  Mendizábal; E.  Bernat-Maso; L.  Gil

doi:10.3989/mc.2022.07721

Authors

L. Mercedes Department of Strength of Materials, Polytechnic University of Catalonia https://orcid.org/0000-0003-2520-8599
V. Mendizábal LITEM Laboratory for Technological Innovation of Structures and Materials https://orcid.org/0000-0003-0919-801X
E. Bernat-Maso Department of Strength of Materials, Polytechnic University of Catalonia - Serra Húnter Fellow, Polytechnic University of Catalonia https://orcid.org/0000-0002-7080-0957
L. Gil Department of Strength of Materials, Polytechnic University of Catalonia https://orcid.org/0000-0002-2007-4846

DOI:

https://doi.org/10.3989/mc.2022.07721

Keywords:

Cyclic loading test, Concrete beam, Vegetal fibres, Hemp, FRCM

Abstract

Fabric-reinforced cementitious matrix (FRCM) composites are materials that are usually applied to strengthen existing structures. In this study, a hemp mesh coated with epoxy was manufactured and combined with a cementitious matrix to strengthen a concrete beam. This beam was subjected to bending cyclic loading tests and a nondestructive modal analysis test. The modal analysis was performed to determine the dynamic elastic properties of the beam under pre-cracking, post-cracking, and strengthened conditions. The beam stiffness increased following strengthening with hemp-FRCM. The results of the experimental cyclic loading test showed that the hemp-FRCM system improved the load-bearing capacity of the beam at the service limit state by 42%. Analytical and numerical models were adjusted and validated using the experimental results, and both proved to be effective calculation tools. The models accurately reproduced the behaviour of the FRCM-strengthened concrete beam if the strengthening connection could prevent sliding and mortar debonding failures.

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