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+---
+type: concept
+title: "Midas Civil Element Library and Section Stiffness"
+created: 2026-06-02
+updated: 2026-06-02
+address: c-000160
+aliases:
+  - MIDAS Civil element library
+  - midas Civil section stiffness
+tags:
+  - concept
+  - finite-element-method
+  - midas-civil
+  - elements
+status: current
+related:
+  - "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
+  - "[[midas Civil]]"
+  - "[[Beam and Frame Finite Elements]]"
+  - "[[Plane Stress and Plane Strain Elements]]"
+  - "[[Isoparametric Linear Solid Elements]]"
+  - "[[Midas FEA Element Library]]"
+sources:
+  - "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
+---
+
+# Midas Civil Element Library and Section Stiffness
+
+## Definition
+
+Midas Civil element library and section stiffness is the product layer that maps structural members and continua to finite element types and their required stiffness data.
+
+## How It Works
+
+The analysis reference lists truss, tension-only hook, cable, compression-only gap, beam, tapered beam, plane stress, plane strain, axisymmetric, plate, and solid elements. Element input combines type, material, stiffness data, location, shape, size, and connection node numbers.
+
+Section and stiffness requirements depend on element family. Truss, tension-only, and compression-only elements need cross-sectional area. Beam elements need section properties. Plane stress and plate elements need thickness. Plane strain, axisymmetric, and solid elements use material and geometry without a separate section input. SRC beams and composite sections require equivalent stiffness handling.
+
+## Solver Development Notes
+
+- Element type should determine DOF set, interpolation, local axes, required property schema, and result recovery.
+- Effective shear area must be explicit because omitting it changes shear-deformation stiffness.
+- Torsional stiffness should not be blindly equated with polar moment except for appropriate circular or tube sections.
+- Composite and construction sections require time- or stage-dependent effective properties.
+
+## Connections
+
+- [[Beam and Frame Finite Elements]] covers member stiffness ideas.
+- [[Plane Stress and Plane Strain Elements]] and [[Isoparametric Linear Solid Elements]] cover continuum families.
+- [[Midas FEA Element Library]] is the detail-FE sibling reference.
+- [[Abaqus Element Library]] is the broad production-library comparison point.