ABSTRACT
Towards developing a reliability-based design model for fastening system, quantification of the model uncertainty is a prerequisite, since this is significant to structural performance. This contribution is focused on the statistical characterisation of model uncertainty related to shear breakout predictive model for single anchors in concrete according to the EN 1992-4 design code. The model uncertainty statistics were derived by comparing unbiased predicted shear breakout capacity with measured breakout capacity from experimental tests. Model uncertainty was confirmed to be significant for the EN 1992-4 model with high variations and high unconservative bias obtained (overestimation of shear resistance). The model uncertainty did not display any major trend with shear parameters. This means that EN 1992-4 code can predict the influence of input parameters on shear breakout resistance reasonably. However, the general overestimation of mean shear capacity by EN 1992-4 model is a cause for concern. Adequate reliability of EN 1992-4 shear breakout capacity model should be confirmed for anchors with varying design parameters.
