Use the Flat Slab form to define the size, thickness, load and post-tensioning properties for the slab, the size and height of the columns, and the size and thickness of the drop panels, if any.
Plan Dimensions.
Along X Direction. The Left and Right Edge Distance edit boxes can be used to specify the extents of the slab beyond the outside grid lines. The Number of Spans and the Spacing edit boxes specify the grids in the X direction. Accept the defaults or specify values by typing directly in the edit boxes.
Along Y Direction. The Top and Bottom Edge Distance edit boxes can be used to specify the extents of the slab beyond the outside grid lines. The Number of Spans and Spacing edit boxes specify the grids in the Y direction. Accept the defaults or specify values by typing directly in the edit boxes.
Slab Thickness. Specify the thickness of the slab as a fraction of the longest clear span length plus some additional value, or input the thickness directly.
Column Dimensions. Input the Column Size and the Column Height Below the model datum plane. A column property will be created based on the square column size specified.
Model Column Intersection as Stiff Slab check box. Click this check box if a stiff slab object should be added at the column location to account for the increase in slab stiffness over the column.
Load. Input surface loads for both dead (in addition to self weight) and live load patterns.
Create Auto Live Load Patterns check box. Click this check box if the program should automate the generation of pattern loading. That is, when the check box is checked, it will not be necessary to use the Define menu > Load Patterns command to define load patterns for the model, although the command can be used to review the auto live loading, and if necessary, add additional load patterns.
Drop Panel Dimension. Check the Drop panel check box if the model should include drop panels at the columns. Input the Size and Thickness of the desired drop panels.
Post Tensioning. Check the Add P/T check box if the model should include post-tensioning to balance a portion of the self-load.
button. If tthe Add P/T check box is checked, the button will be available. Click the button to display the Quick Tendon Layout form.
TIP: The Calculator feature can be used to assist with mathematical operations during data entry. Place the mouse pointer/cursor in an edit box, hold down the Shift key and double click the left mouse button to access the form.
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Access the Flat Slab form as follows:
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