How to Load a Submodel in IDEA StatiCa Detail (2D) — Statically Determinate Structures

Here's a ready-to-paste YouTube description based on the session: How to Load a Submodel in IDEA StatiCa Detail (2D) — Statically Determinate Structures Learn how to correctly transfer internal forces and loads from a global model into an IDEA StatiCa Detail 2D submodel while preserving static equilibrium. In this session, Lukas (computational validation engineer at IDEA StatiCa) walks through a simply supported beam example — from the global model all the way to a reinforced detail with an opening — and compares the submodel results against the full beam. What you'll learn: Why boundary internal forces from the global model must be applied together with the member loads at the trimmed ends How static equilibrium keeps the submodel "in place" rather than behaving like a cantilever Why forces (not displacements) are recommended for nonlinear stress redistribution How 1D beam forces are redistributed into the 2D wall using the Saint-Venant zone and rigid body constraints (RBE2) Building a reinforced detail with a circular opening from scratch — bars, stirrups, anchorage, and the opening cage Defining load cases, assigning shear force and bending moment at a chosen section, and running ULS checks Comparing stresses, reinforcement utilization, and deflections between the full beam and the submodel Example setup: 10 m simply supported beam, rectangular section, concrete C30/37, single uniform load case (25 kN/m), designed to Eurocode. ⏱ Chapters 00:00 Intro & session overview 00:40 Global model (statically determinate beam in Midas Civil) 02:08 Prerequisite: static equilibrium 03:08 Applying boundary forces + member loads together 04:09 Why use forces instead of displacements (nonlinear analysis) 05:05 Saint-Venant zone & rigid body constraints (RBE2) 07:30 Two models: full beam vs submodel 10:08 Comparing the results 11:03 Building the submodel from scratch 16:00 Reinforcing around the opening 17:05 Defining the load case 18:00 Assigning internal forces at the section 19:49 Combinations & running the analysis 24:43 Submodel vs full beam — stresses, bars & deflections 26:57 Key takeaways 28:07 Contact & next session (hyperstatic structures) Key takeaway: Internal forces and applied loads at the trimmed ends must both be included in the submodel to preserve the same static equilibrium as the global structure. Because the global model is statically determinate, its boundary forces transfer directly and unambiguously to the nonlinear submodel — giving reliable, physically correct results. 👉 Next session: submodels for hyperstatic (statically indeterminate) structures. 📩 Need training or want to consult on IDEA StatiCa? I'm a certified IDEA StatiCa trainer — reach out via the links below. StrucInsight@gmail.com #IDEAStatiCa #StructuralEngineering #CBFEM #Eurocode #ReinforcedConcrete #FEA #StructuralDesign #CivilEngineering