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+---
+type: concept
+title: "Midas Civil Numerical Analysis Model"
+created: 2026-06-02
+updated: 2026-06-02
+address: c-000159
+aliases:
+  - MIDAS Civil numerical model
+  - midas Civil analysis model
+tags:
+  - concept
+  - finite-element-method
+  - midas-civil
+  - modeling
+status: current
+related:
+  - "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
+  - "[[midas Civil]]"
+  - "[[Finite Element Method]]"
+  - "[[Finite Element Program Implementation]]"
+  - "[[Finite Element Modeling and Convergence Checks]]"
+sources:
+  - "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
+---
+
+# Midas Civil Numerical Analysis Model
+
+## Definition
+
+Midas Civil numerical analysis model is the structural model abstraction described in the [[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]: nodes locate the structure, finite elements convert members and continua into numerical data, and boundary conditions describe connection to adjacent bodies or supports.
+
+## How It Works
+
+The manual emphasizes three coordinate layers. Global coordinates define the model reference frame. Element coordinates define member or element-local quantities. Node local coordinates let users prescribe constraints, boundary springs, displacements, and reactions in arbitrary directions.
+
+The model is intentionally simplified from the real structure. The manual's practical warning is that simplification must stay inside the analysis purpose: element type, mesh idealization, member offsets, boundary assumptions, and local axes can strongly change the computed response.
+
+## Solver Development Notes
+
+- Input data should separate nodes, element connectivity, element type, material, stiffness/section data, and boundary/link definitions.
+- Coordinate transformations are first-class data, not postprocessing details.
+- A custom solver needs diagnostics for missing stiffness, inconsistent local axes, overconstraints, and boundary assumptions.
+- Verification should include model-equivalence checks: same physical bridge member modeled with different element or offset choices should be compared intentionally.
+
+## Connections
+
+- [[Finite Element Method]] supplies the general discretization logic.
+- [[Finite Element Program Implementation]] maps this model into assembly, solve, and recovery stages.
+- [[Finite Element Modeling and Convergence Checks]] captures the analyst-side reliability concern.