Abstract
This contribution characterises the model uncertainty related to the shear breakout resistance of anchors located towards the edge of concrete members, considering experiments obtained from previous anchor test. The characterisation includes the computation of the sample moments (mean, standard deviation and skewness) required in reliability analysis. The study analysed the predictive models of current design guidelines (ACI 318 and the modified concrete capacity design method [MCCD] method). The assessment demonstrates that ACI 318 has a higher bias and variability compared to the MCCD method. The influence of the breakout resistance parameters on model uncertainty was evaluated, and significant parameters were identified. The edge distance and the anchor diameter are found to be the most influencing parameters. Also, a suitable theoretical probability distribution is required in reliability analysis for the model uncertainty random variable. Accordingly, it is shown that the log-normal distribution is the most appropriate probability distribution for the derived model uncertainty factors.
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