Intermediate Flexural Crack Debonding in RC Beams Strengthened with Externally Bonded Engineered Cementitious Composite (ECC) Plates
Volume Title: ICASGE2025
Paper ID : 1043-ICASGE-FULL (R1)
Authors
1Demonstrator, Structural Engineering Department, Faculty of Engineering, Tanta University
2Structural Engineering Department, Faculty of Engineering, Tanta University, Tanta, Egypt
Abstract
Applying engineered cementitious composite (ECC) plates to enhance the flexural capacity of reinforced concrete (RC) beams introduces specific challenges, particularly regarding the appearance of intermediate crack-induced debonding failure modes. This study investigates the behavior of RC beams strengthened with polyvinyl alcohol hybrid fiber-reinforced engineered cementitious composite (SPH-ECC) plates through finite element modeling (FEM). A comparison was conducted between the experimental and FEM results showing good agreement. The validated FE models were extended for some useful parametric studies of interest. The difference in debonding stress between the beam test and the single-lap shear test was investigated. Additionally, proposed analytical models for the analysis of FRP-strengthened concrete structures were used to determine the debonding stresses in SPH-ECC plates. Based on theoretical predictions, comparisons with FEM results indicate that the proposed models cannot be applied to cement-based composites. This is due to the bi-linear behavior of SPH-ECC plates under uniaxial tension and their bonding characteristics. The comparison results show that a more accurate predictive approach is needed to better estimate debonding failures in RC beams strengthened with ECC plates.
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