Abstract
FRP strengthening using near surface mounted (NSM)is recognized as a highly effective method for strengthening structures using FRP material. However, there are some drawbacks associated with this technique. One of the challenges is concrete cover separation failure, which leads to premature material failure and restricts NSM technique applicability. To address this issue, multinomial logistic regression (MLR) analysis is used. This analysis aimed to investigate the factors (Total Equivalent Steel Ratio TESR%, Stirrup Steel Ratio%, and presence of an anchorage) that can be used to predict the failure modes of reinforced concrete beams strengthened with the FRP-NSM system using a previously published dataset consisting of 131 beam tests from 25 studies. By using odds ratios, which are exponential coefficients, the MLR results were interpreted. The study indicated that a reduction in the TESR% predictor or increase in Stirrup Steel Ratio%, deceases the probability of conversion from concrete cover separation to other failure modes such as flexural failure, FRP bar debonding, and FRP bar rupture. Moreover, the reinforced concrete beams strengthened with the FRP-NSM system with anchorage has a positive contribution on the expected the failure modes: flexural failure, FRP bar debonding, and FRP bar rupture compared to concrete cover separation. Based on the classification table analysis, the model’s correct classification rate was 51.1%. The model is accurate in predicting failure modes, as its rate is higher than the chance accuracy rate of 36.4%.
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