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Q2.

Can CAST handle multiple loading cases in one model?

Yes, multiple loading cases can be created in one CAST model. In CAST terminology, this is called multiple Load Conditions. Different strut-and-tie models can also be created to accommodate different load patterns. The current version, however, does not automatically consider any strength and/or stiffness degradation in the struts or ties, caused by plastic strain and crack history of other Load Conditions. For each Load Condition, you must explicitly supply reasonable strength limits and relative stiffnesses that reflect the strength/stiffness degradation in the struts and ties.

By default, CAST assumes there is one Load Condition named LC1.

To add a new Load Condition:

• Select Load Conditions from the Define menu. The Define Load Conditions shown in Figure 2.1 below will appear.

Figure 2.1   The Define Load Conditions Dialog Box

• Add the new Load Condition name in the Name text box in the Load Condition List frame.

• Click the Add button.

• The Select Objects for New Load Condition dialog box similar to Figure 2.2 will then be revealed. In this dialog box, select objects you want to include in this Load Condition. Select the D-Region Boundaries Only option if you want to create the Strut-and-Tie Model for the new Load Condition from scratch. Select D-Region Boundaries + Strut-and-Tie Model Identical to the Model for Load Condition option if you want to select a Strut-and-Tie Model pattern from the available Strut-and-Tie Models associated with the existing Load Conditions, include it for the new Load Condition, and later change it accordingly. Once you check this option, you can select one of the available Strut-and-Tie Models from the combo box.



Figure 2.2   The Select Objects for New Load Condition Dialog Box

• Click the OK button to confirm this input and close the Select Objects for New Load Condition dialog box.

• The new Load Condition name you supplied is now listed in the Defined Load Conditions list box of the Define Load Conditions dialog box. Click again the OK button to confirm the addition and close the dialog box.

To modify a Load Condition name:

• Select Load Conditions from the Define menu. The Define Load Conditions shown in Figure 2.1 below will appear.

• Click the Load Condition name you want to change from the Defined Load Conditions list box. The name will show up in the Name text box.

• Type in the new name.

• Click the Modify button.

• Click the OK button to confirm the change and close the dialog box.

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