Logic-guided neural network for predicting steel-concrete interfacial behaviors

•A logic-guided neural network is presented to predict steel-concrete interfacial behaviors.•Logic and scientific principles are utilized in the logic-guided neural network.•Strategies are presented to utilize unstructured data and datasets with incomplete data.•The bond stress-slip curves of steel-concrete interface are predicted.•The logic-guided neural network achieves a desired performance of prediction. The interfacial behaviors play significant roles in various composite materials and structures. This paper presents a logic-guided neural network to seamlessly integrate data-driven methods and scientific knowledge in predicting interfacial properties of steel-concrete composites. The investigated properties include the bond strength, interface slip, and bond-slip relationship. Three methods are proposed to conform to logic and scientific principles: (1) logic data are generated to supplement experimental data; (2) a logic loss function is presented to guide the learning process; and (3) unstructured data and incomplete data are utilized to enlarge the dataset. The performance of the presented method is compared with four representative machine learning methods, which are artificial neural network, tree boosting, random forest, and epsilon-support vector regression. The results indicated that the proposed method achieved the highest accuracy. The coefficients of determination of the bond stress and compressive strength are higher than 0.95, and the predicted bond-slip behaviors conform to prior knowledge. The proposed method is useful for prediction of properties for composite materials and structures.