Numerical investigation on the torsional improvement of reinforced concrete beams strengthened with various techniques
M. A. Yusuf, M. S. Zahran, A. Osman, Nabil. M. Nagy
TL;DR
This study uses digital modeling to evaluate how different reinforcement techniques improve the torsional strength of reinforced concrete beams.
Contribution
A validated finite element model is developed to optimize torsional reinforcement techniques in RC beams.
Findings
NSM stirrups with overlap lengths of 0.6d to 0.8d increased ultimate moment by 110–138%.
Inclined bracing showed 338% efficiency in resisting torsional stress compared to vertical bracing.
Combining NSM stirrups with up to three layers of steel mesh maximized torsional performance.
Abstract
This study digitally investigates the torsional behavior of reinforced concrete (RC) beams strengthened with near-surface bracing (NSM) and external bracing using Abaqus/CAE software. Finite element analysis (FE) was developed based on a previously validated experimental program, encompassing five tested beams, thus providing a realistic basis for model validation. The numerical results showed strong agreement with experimental trends, with deviations of less than 5%, confirming the model’s accuracy and reliability. The analysis utilized the concrete deterioration plasticity (CDP) model, realistic surface bonding properties, and the elastic steel behavior to effectively monitor cracking and stiffness degradation. The grid sensitivity indicated that a 25 × 25 mm element size achieved optimal accuracy and efficiency, while an extension angle of ψ = 37° best represented the torsional…
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Taxonomy
TopicsStructural Behavior of Reinforced Concrete · Seismic Performance and Analysis · Concrete Corrosion and Durability