5.3. Continuity and Uncertainty The consistent performance and model uncertainty concerning essential variables were investigated by comparing test and model results. The boxplots of the experiment-to-prediction ratios were made for different ranges of each of the following key explanatory terms: fc′ (Figure 6a), a/d (Figure 6b), b/h (Figure 6c), and ρ (Figure 6d). The boxplots of the bias of the proposed model, ACI 318-14, and the modified probabilistic model were made for comparison.
