reinforced concrete;  finite elements;  element model;  Stiffness matrix

Aiming at the problems existing in the existing reinforced concrete plane element models, the combined model of the reinforced concrete plane problem quadrilateral elements under various reinforcement forms is established, and the general expression of the element stiffness matrix of these models is derived. The comparative analysis with the diffusion element model shows that the combined element model not only conforms to the basic theory of finite element discretization, but also can accurately reflect the actual structural effect of steel bars, which has strong practicability.