Abstract: Designing hardened reinforced concrete (RC) structures is to ensure adequate ductility of the load-bearing components when it is exposed to blast loading. Therefore, analyzing the dynamic shear force of structures under different blast loadings is important. In this paper, a new effective formula was derived to calculate the dynamic shear force of shear SDOF for one-way reinforced concrete (RC) structures subjected to non-uniform explosive loading. The proposed method was based on a static model that describes the dynamic shear force-time history in RC members.