김경종
52 lines
2.3 KiB
Markdown
52 lines
2.3 KiB
Markdown
---
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type: concept
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title: "Midas Civil Element Library and Section Stiffness"
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created: 2026-06-02
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updated: 2026-06-02
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address: c-000160
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aliases:
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- MIDAS Civil element library
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- midas Civil section stiffness
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tags:
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- concept
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- finite-element-method
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- midas-civil
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- elements
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status: current
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related:
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- "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
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- "[[midas Civil]]"
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- "[[Beam and Frame Finite Elements]]"
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- "[[Plane Stress and Plane Strain Elements]]"
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- "[[Isoparametric Linear Solid Elements]]"
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- "[[Midas FEA Element Library]]"
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sources:
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- "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
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---
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# Midas Civil Element Library and Section Stiffness
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## Definition
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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.
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## How It Works
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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.
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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.
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## Solver Development Notes
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- Element type should determine DOF set, interpolation, local axes, required property schema, and result recovery.
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- Effective shear area must be explicit because omitting it changes shear-deformation stiffness.
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- Torsional stiffness should not be blindly equated with polar moment except for appropriate circular or tube sections.
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- Composite and construction sections require time- or stage-dependent effective properties.
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## Connections
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- [[Beam and Frame Finite Elements]] covers member stiffness ideas.
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- [[Plane Stress and Plane Strain Elements]] and [[Isoparametric Linear Solid Elements]] cover continuum families.
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- [[Midas FEA Element Library]] is the detail-FE sibling reference.
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- [[Abaqus Element Library]] is the broad production-library comparison point.
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