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wiki/concepts/Midas Civil Heat of Hydration and Thermal Stress Analysis.md

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+---
+type: concept
+title: "Midas Civil Heat of Hydration and Thermal Stress Analysis"
+created: 2026-06-02
+updated: 2026-06-02
+address: c-000168
+aliases:
+  - MIDAS Civil hydration heat analysis
+  - midas Civil thermal stress analysis
+tags:
+  - concept
+  - finite-element-method
+  - midas-civil
+  - heat-transfer
+  - thermal-stress
+status: current
+related:
+  - "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
+  - "[[midas Civil]]"
+  - "[[Finite Element Heat Transfer and Field Problems]]"
+  - "[[Finite Element Thermal Stress Analysis]]"
+  - "[[Midas FEA Heat Transfer and Hydration Analysis]]"
+sources:
+  - "[[Midas-Civil-Analysis-Reference|Midas Civil Analysis Reference]]"
+---
+
+# Midas Civil Heat of Hydration and Thermal Stress Analysis
+
+## Definition
+
+Midas Civil heat of hydration and thermal stress analysis is the coupled temperature and stress workflow for mass concrete and concrete-age effects.
+
+## How It Works
+
+The manual describes heat transfer by conduction, convection, internal heat generation, pipe cooling, initial temperature, ambient temperature, and prescribed temperature. Thermal stress analysis uses equivalent age or maturity to model concrete strength development and combines temperature strain, shrinkage strain, and creep strain in stress evaluation.
+
+Hydration analysis therefore has two layers: first solve the temperature field, then transfer the temperature and age-dependent material state into structural stress analysis.
+
+## Solver Development Notes
+
+- Thermal DOFs, heat capacity, conductivity, convection, heat source, and boundary temperature data need a field-problem input schema.
+- Structural transfer must define thermal strain, reference temperature, age-dependent modulus or strength, shrinkage, and creep.
+- Equivalent-age and maturity functions should be regression-tested against simple closed-form or reference-solver cases.
+- Output should include temperature history, thermal stress, crack risk indicators, and structural reaction effects.
+
+## Connections
+
+- [[Finite Element Heat Transfer and Field Problems]] provides the field equation base.
+- [[Finite Element Thermal Stress Analysis]] covers constrained thermal strain and equivalent force ideas.
+- [[Midas FEA Heat Transfer and Hydration Analysis]] is the detail-FE sibling page.