Eurocode Bridge Insight midasBridge Strut-and-Tie Model STM B-region Bernoulli Region Nodal Zone Hydrostatic Nodal Zone Extended Nodal Zone Subdivision Nodal Zone Truss Model D-region Discontinuity Region Truss Analogy 45-Degree Truss Model Variable Angle Truss Modified Truss Model Plastic Truss Model Components of Strut-and-Tie Model Struts Tension Ties AASHTO Classification Field_Bridge Category_Knowledge Structure Type_Bridge Design Code_Eurocode Design Code_AASHTO