In the present paper, a developed stepwise regression (SR) model for predicting the member moment capacity of half-through I-section bridges girders has been presented. The reliable database (training and testing data) for SR-based model are generated by a developed Finite Element (FE) model which has been verified by related existing experimental investigations using software ABAQUS. Then based the SR modeling a practical formulae has been presented. To verify the accuracy of the proposed formulae, the FE results of specimens which have not been employed in the SR modeling process are used. The results indicate that SR-based model provide good predictions which are more accurate than those from other available methods. The proposed SR formulation can be used for predicting the RDB capacity of half-through I-section bridges girders with good accuracy.
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