Heat of Hydration Analysis Control

Specify the analysis conditions for a heat of hydration analysis. MIDAS/Gen follows the procedure noted below for a heat of hydration analysis.

1.Select Model > Properties > Time Dependent Material(Creep/Shrinkage) and Model > Properties > Time Dependent Material(Comp. Strength) to specify the time dependent properties. And then link the general material properties and time dependent material properties in Model > Properties > Time Dependent Material Link.

2. Enter the relevant data necessary for the heat of hydration analysis in the sub menus of Load > Hydration Heat Analysis Data.

3. In Analysis > Hydration Heat Analysis Control, specify the temporal discretization factor, initial temperature, location of stress output and whether or not to include Creep and Shrinkage.

4. Select the Analysis > Perform Analysis menu or click   Perform Analysis to carry out the analysis.

5. Once the analysis is completed, check the analysis results in contours, graphs and animation.

From the Main Menu select Analysis > Heat of Hydration Analysis Control.

Heat of Hydration Analysis Control dialog box

Final Stage

Specify a stage to be considered as the final construction stage of the heat of hydration analysis.

Last Stage
Assign the last stage as the true last stage.

Other Stage
Assign a stage within the overall construction stages as the final stage. Analysis will be performed only up to the Stage specified here.

Integration Factor

Enter the Temporal discretization Factor, used in heat transfer analysis.

= 0: Forward difference

= 1/2: Crank-Nicolson method

= 2/3: Galerkin method

= 1: Backward difference

 

Initial Temperature

Specify the initial temperature used in the heat transfer analysis.

Element Stress Evaluation

Specify the location in solid elements for stress output.

Center: Use the stresses at the centers of the solid elements to represent the stresses of the individual elements.

Gauss: Use the stresses at the Gauss points as the nodal stresses.

Nodal Point: Interpolate the stresses at the Gauss points for nodal stresses.

Creep & Shrinkage

Account for Creep and Shrinkage in the analysis.

Type
Select one of the options for inclusion of creep and shrinkage in the analysis.

Creep Calculation Method
Select one method for calculating creep between the method using Code (General) and the method using effective modulus of elasticity (Effective Modulus).

General
When General is selected, creep and shrinkage are accounted for according to the Code specified in Time Dependent Material (Creep/Shrinkage).

Convergence for Creep Iteration
Specify the convergence requirement for ending the repetitive process in the analysis reflecting creep.

Number of Iterations: Maximum number of repetitions

Tolerance: for convergence

Effective Modulus

Effective Modulus of Elasticity is an approximate calculation method to account for creep.

The reduction factor, phi1, is applied to Modulus of Elasticity from 0(day) to n1(day).  The reduction factor, phi2, is applied to Modulus of Elasticity after n2 (day).  Between n1 and n2, the reduction factor is interpolated.

Note
If a file of a previous version, which contains creep data defined by Effective Modulus method, is opened, the related creep data becomes deleted.  The data needs to be redefined.

 

Use Equivalent Age by Time & Temperature

Select whether or not to use Equivalent Age based on Time and Temperature for Heat of Hydration Analysis.

 

Include Selfweight Load

Check this option to include Selfweight. Enter ?1?to consider the selfweight in the gravity direction.

 

: Remove the analysis conditions and do not perform the heat of hydration analysis.