Displacement response analysis of steel-concrete composite panels subjected to impact loadings

•A trilinear resistance function for SDOF analysis of SC panels was developed.•Theoretical formulas for calculating the resistance and stiffness were derived.•The model effectively evaluates the displacement response of SC panels under impact. Steel-concrete composite (SC) panels consist of two steel faceplates and a concrete core. The past studies have shown that the SC panels are effective against impact loadings. This paper presents a method for evaluating the displacement response of SC panels subjected to impact loadings using the equivalent single-degree-of-freedom (SDOF) model. The resistance and stiffness of the SC panels are theoretically derived and validated to develop an idealized trilinear resistance function model. The validations against the past experimental results show that the proposed model provides a basis for the dynamic response analysis of SC panels and lays a foundation for further design methods.