Conference Agenda
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Session Overview |
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PL5: Plenary Lecture 5
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9:00am - 9:40am
Exploring the potential of new reinforcements for the structural strengthening using advanced numerical simulations University of Minho, Portugal <p>This study investigates the effectiveness of iron-based shape memory alloy (Fe-SMA) U-shaped stirrups for shear strengthening of reinforced concrete (RC) beams in combination with near-surface mounted (NSM) carbon fibre reinforced polymer (CFRP) laminates. A three-dimensional multidirectional fixed smeared crack model was used for numerical simulations. The model’s accuracy was first verified using experimental data from RC beams strengthened solely with NSM CFRP laminates. Subsequently, Fe-SMA stirrups were incorporated to evaluate their performance under service and ultimate limit states. The effects of prestress level and activation sequence on Fe-SMA stirrups were examined to identify an optimal hybrid configuration. Results show that using 𝜌𝑠𝑤=0.64% U-shaped Fe-SMA stirrups prestressed to 80% of its yield stress, combined with 𝜌𝑓𝑤 = 0.11٪ NSM CFRP laminates, increased shear capacity by 100% compared to the reference beam and by 28% relative to beams strengthened only with NSM CFRP. Moreover, applying the estimation of the coef-ficient of variation (ECoV) method reduced the predicted load capacity by 30–38%.</p> | ||
