Bond strength of glass fibre-reinforced polymer bars in unconfined concrete

Bond strength and development length of glass fiber-reinforced polymer bar in unconfined self-consolidating concrete

“…The overall evaluation of proposed model from all databases (Esfahani et al, 1 Golafshani et al 2 Figure 4. The model introduced by Choi et al 14 shows higher deviation (18.32%) than equation (2) (12.20 %). Hence, unlike existing models, the predicted bond strengths by equation (2) are in good agreement with the test results.…”

“…Evaluation of equation (2) for bond strength of GFRP bar in SCC by pull-out tests is shown in Figure 3. Although the response of the model presented by Choi et al 14 is very close to the new equation, it generates significant deviation from experimental database. As shown in Table 1, the ratio of fine to all aggregates is approximately constant for existing database 1,2 (0.595 and 0.599, respectively).…”

“…As shown in Figure 1, among the existing theoretical models, the proposed model in this study is more accurate and applicable. Although the IAE value of the model presented by Choi et al 14 shows acceptable results, the performance of a model depends very much on the large amount of test data. So, more extensive data are needed to investigate the efficiency and accuracy of an efficient model.…”

“…As shown in Table 3, the IAE between the equations and the experimental results is in the range of 11.38 to 63.25%, and COV is in the range of 0.95 to 2.68, which illustrates that the existing equations are not applicable for predicting the bond strength of GFRP bar in SCC. The model introduced by Choi et al 14 generates the lowest IAE among the seven models.…”

Bond Strength of GFRP Bars Embedded in Engineered Cementitious Composite using RILEM Beam Testing

“…Different types of GFRP reinforcement exhibited different rates of degradation of the flexural capacity when embedded in concrete under the same exposure conditions. Extensive research studies have been conducted on the use of GFRP bars in structural elements and on bond characteristics of GFRP bars with conventional concrete (Hossain et al 2014;Lee et al 2008;Choi et al 2012;Masmoudi et al 2011;Yan et al 2016;Gu et al 2016;Chaallal and Benmokrane 1993;Robert and Benmokrane 2010;Tighiouart et al 1998;Hao et al 2009). The bond behaviour of GFRP bars is different from that of deformed steel bars.…”