Calculation method for ultimate bearing capacity of reinforced concrete beams based on unified strength theory

In order to improve the accuracy and reliability of the calculation results of the ultimate bearing capacity of reinforced concrete beams, this paper proposes a calculation method for the ultimate bearing capacity of reinforced concrete beams based on the unified strength theory. Firstly, we analyse the mechanical properties of reinforced concrete materials and conduct principal stress analysis of reinforced concrete beams. Then, the plastic damage model (CDP model) is used to simulate the mechanical properties of concrete components under reciprocating loads. Based on the unified strength theory assumption, concrete and steel bars are considered as equivalent materials, and the shear deformation method is used to calculate the ultimate bearing capacity. The results show that the accuracy of the proposed method can reach up to 99.2%, indicating that the proposed method can effectively improve the accuracy of calculating the ultimate bearing capacity of reinforced concrete beams.