An experimental study and a proposed theoretical solution for the prediction of the ductile/brittle failure modes of reinforced concrete beams strengthened with external steel plates

Hau Nguyen Van; Thanh Bui Tien; Phe Pham Van; Long Nguyen-ngoc

doi:10.3221/IGF-ESIS.61.13

An experimental study and a proposed theoretical solution for the prediction of the ductile/brittle failure modes of reinforced concrete beams strengthened with external steel plates

Authors

Hau Nguyen Van Faculty of Civil Engineering, University of Transport and Communications, Cau Giay, Hanoi, Vietnam
Thanh Bui Tien Faculty of Civil Engineering, University of Transport and Communications, Cau Giay, Hanoi, Vietnam
Phe Pham Van Faculty of Civil Engineering, University of Transport and Communications, Cau Giay, Hanoi, Vietnam
Long Nguyen-ngoc Faculty of Civil Engineering, University of Transport and Communications, Cau Giay, Hanoi, Vietnam

DOI:

https://doi.org/10.3221/IGF-ESIS.61.13

Keywords:

strengthening reinforcement concrete beam, External steel plate, flexural reinforcement limit, tension chord model, ductile failure conditions

Abstract

An experimental study and a proposed theoretical solution are conducted in the present study to investigate the ductile/brittle failure mode of reinforced concrete beams strengthened with an external steel plate. The present experimental study has fabricated and tested six steel plate-strengthened RC beams and one non-strengthened RC beam under 4-point bending loads. The proposed theoretical model is then developed based on the observed experimental results to analyze the crack formation, to determine the distance between vertical cracks and to quantitatively predict the ductile/brittle failure mode of plate-strengthened RC beams. The experimental study shows that the failure mode is based on the sliding of concrete along with the external plate. This slip is limited between two vertical cracks, from which the maximum stress in the external steel is determined. Based on comparisons conducted in the present study, excellent agreements of the stresses/strains in soffit steel plates, crack distances, and system failure modes between the current theoretical solution and the previous and present experimental results are observed.

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Published

19-06-2022

Issue

Vol. 16 No. 61 (2022): July 2022

Section

Failure Analysis, Case Studies and Forensic Engineering

License

This work is licensed under a Creative Commons Attribution 4.0 International License.

Copyright
Authors are allowed to retain both the copyright and the publishing rights of their articles without restrictions.

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How to Cite

An experimental study and a proposed theoretical solution for the prediction of the ductile/brittle failure modes of reinforced concrete beams strengthened with external steel plates. (2022). Frattura Ed Integrità Strutturale, 16(61), 198-213. https://doi.org/10.3221/IGF-ESIS.61.13