Define Construction Stage for Hydration

Define the construction stages to analyze heat of hydration, which reflect time variant factors by activating and deactivating elements, boundary conditions and loadings relevant to each construction stage. Static load groups can be also activated or deactivated, which can be simultaneously considered in heat of hydration analysis.

From the Main Menu select Load > Heat of Hydration > Heat of Hydration Analysis Data > Define Construction Stage for Hydration

: Define and add a new Construction Stage to the stage list. The new stage is added to the end of the list.

: Add a new construction stage immediately preceding the selected stage in the list.

: Add a new construction stage immediately after the selected stage in the list.

: Modify or check the data for the stage selected in the list.

: Delete the construction stage selected in the list.

: Close the Construction Stage dialog box.

When a new construction stage is defined

Depending on the timing of the new construction stage, click ,   or  to invoke the dialog box for Compose Construction Stage for Hydration.

Stage

Name
Enter the name of construction stage to be defined.

Initial Temperature

Initial temperature for newly activated elements at a corresponding construction stage is specified. If the initial temperature is not assigned or if it is inputted as "0"at the corresponding construction stage, then the temperature assigned to initial temperature at Heat of Hydration Analysis Control will apply. If the initial temperature is assigned then the inputted temperature will apply.

: Clicking the button lists nodes, elements and boundary and load groups, which can be applicable at the current construction stage.

Step

Time (hr)
Specify the number of time steps and the duration of each step constituting the construction stage. As shown in the Example, after assigning steps and durations by clicking on the tabs, a list of step numbers and corresponding duration time is invoked on the right. The steps can also be auto generated by using the Auto Generation dialog box.

Auto Generate
Multi-steps can be automatically generated. Specify the number of steps in the Step Number field and the entire duration time in Duration. Then click on Generate Steps tab. The total duration is equally divided by the number of steps in the logarithmic scale.

Duration: Duration of time to be auto generated.

Step Number: Number of steps to be auto generated.

Assigning additional steps is still possible after Auto generation. The user can input additional steps in Time (hr) input box. Also, after the steps are defined, the user can assign additional steps using the Auto Generation dialog box.

: In the current construction stage being defined, specify the times subsequent to the time corresponding to the last step defined thus far, which will be added to the bottom of the list.

: Modify the time of the selected step in the Step list.

: Delete the selected steps from the Step list.

: Clear all the steps listed in the Step to revert to the initial state.

Element tab

Activate or deactivate element groups (Structure Groups) to define the relevant elements applicable to the construction stage being defined.

Group List
It lists the predefined element groups. Click to the right to prompt Define Structure Group to add or modify previously defined element groups.

Activation
Assign relevant structure groups in the Group List, which will become active in the construction stage being defined. Click to activate the selected groups. Select the groups to be excluded from the activated group list and click .

Boundary tab

Activate or deactivate boundary groups to define the relevant boundary conditions applicable to the construction stage being defined.

Group List
It lists the predefined boundary groups. Click to the right to prompt Define Boundary Group to add or modify previously defined element groups.

Activation
Assign relevant boundary groups in the Group List, which will become active in the construction stage being defined. Click to activate the selected groups. Select the groups to be excluded from the activated group list and click .

Active Time

Assign the starting time when the load group becomes activated during the corresponding construction stage.

Deactivation
Operation for deactivation is similar to that of activation.

Inactivate time

Assign the starting time when the load group becomes deactivated during the corresponding construction stage.

Note
Boundary groups become active or inactive at the moment that the corresponding construction stage begins.

Load tab

By activating or deactivating load groups, user can specify static loads for the corresponding construction stages. The types of static loads that can be specified during heat of hydration construction stage analysis are Nodal Load, Pressure on a Solid Element, and Pretension Load in a Truss.

Group List
The list of all the predefined load groups is displayed. Click the button to the right to prompt the Define Load Group dialog box to add or modify groups.

Activation
Select relevant load groups in the Group List, and click   to activate the selected groups. Click   to expel the selected load groups from the activation group list to the main Group List.

Active Time
Enter the time at which the loading group become activated in the corresponding construction stage. General static load can only be assigned in the User Step and not in either the First or the Last Step.

Deactivation
Select relevant load groups in the Group List, and click to deactivate the selected groups. Click to expel the selected load groups from the deactivation group list to the main Group List.

Inactive Time
Enter the time at which the loading groups become deactivated in the corresponding construction stage.

Note
Static load cases to be considered in heat of hydration analysis must be defined as Construction Stage Load (CS) as a load type.