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Volume Title: ICASGE2023

DOI: ICASGE-STA

¹Fathy Mohammed Youssef ; ²Mohamed Abd Elkhalek Sakr; ³tarek khalifa; Fathy Mohammed Youssef; Mohamed Abd Elkhalek Sakr

¹Structural engineering, Fuculty of engineering, Tanta university, Tanta, Egypt

²Tanta University

³structural engineering, fuculty of engineering, tanta university, tanta, egypt

In this study, an improved finite element (FE) model was developed for the prediction of the structural behavior of reinforced concrete beams strengthened with ultrahigh-performance fiber reinforced concrete (UHPFRC). A concrete damage Plasticity model for simulating materials and an implicit solver in abaqus were adopted in the numerical simulation. The model was validated using experimental data. Accurately representing the interfacial bond characteristics of composite UHPFRC–concrete members was the primary challenge in developing the modelling technique. A novel technique using node-to-node interaction method using Cartesian elastic-plastic connector element at the interface between UHPFRC and normal strength concrete (NSC) substrate was proposed for this purpose. The material properties of the equivalent connector elements were defined to represent the equivalent bond characteristics of NSC. The developed FE model was found to be able to effectively and efficiently predict the structural response of composite UHPFRC–concrete members and the modes of failure due to rupture or debonding of UHPFRC plate with good accuracy. Also, the results showed that the interfacial shear strength control the debonding failure load and therefore the effectiveness of the strengthening

Finite element model; RC beams; UHPFRC; strengthening; Debonding

Structural Analysis (STA)