An approach is presented to design reinforced concrete girders with rectangular cross sections against biaxial shear forces. It bases on the design principles of Eurocode 2 and thus compares resistances of tensile and compressive struts to the action of a resultant shear force. The approach is verified by more than 100 numerical simulations. The corresponding spatial finite element model idealises girders in three-point-bending tests. It is parameterised in its basic parameters of geometry, material and load inclination and incorporates an elasto-plastic damage model with isotropic stiffness degradation to describe the nonlinear material properties of concrete. Truss elements discretely model stirrups and longitudinal bars. They are coupled to the concrete solids using the embedded modelling technique. Typical characteristics of biaxial shear in crack pattern, stress distributions and localisation effects are derived and illustrated.
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