Unified Calculation Method for Symmetrically Reinforced Concrete Section Subjected to Combined Loading

摘要

This study introduces a unified formula for calculating the ultimate state of reinforced concrete (RC) members under combined loading conditions, including axial compression, shear, bending, and torsion. The proposed formula is deduced by using bending-torsion interaction as a bridge connecting shear-torsion and bending-axial compression interaction. Interactions of various types are directly considered in the proposed formula. Their strength formulas are determined by comparison of experimental data. Finally, the applicability of the proposed formula is illustrated using a calculation example of a planar frame. It is concluded that that the unified formula can be used as unified failure criteria of RC components to determine the safety of the members under various loading states, and can be used to calculate residual capacity of components under various types of combined loading.