Function
Determine the design code and the special provisions for seismic design (if required) to perform the design or the strength verification for PT Slab design strips according to the following Concrete Design Criteria:
Ultimate Strength Design, the American Concrete Institute (ACI318-19/ACI318M-19)
Note.
ACI 318-19 uses U.S. customary units (ksi, kip, in, ft), whereas ACI 318M-19 uses SI/metric units (MPa, kN, mm, m).
Call
From the Main Menu
select [Post tension] tab > [Design] group > [Design Code Option]
Input
Design Code
Select the design code used for PT slab design and stress verification.
Selfweight Balance Ratio Limit
Min: Specify the minimum allowable selfweight balance ratio.
Max: Specify the maximum allowable selfweight balance ratio.
Precompression Level
Min: Specify the minimum allowable precompression stress level in the PT slab.
Max: Specify the maximum allowable precompression stress level in the PT slab.
Allowable Concrete Stress Limit
By Design Code: Automatically calculates allowable concrete stress limits based on the selected design code provisions.
User Input: Allows the user to define allowable concrete stress limits manually.
k: Specify the coefficient applied to the concrete compressive strength for allowable stress calculations.
Table
The table displays the allowable stress limits corresponding to each concrete material.
ID: Material identification number.
Material Name: Name of the concrete material.
f'c (kips/in²): Specified concrete compressive strength in the 'Modify material' option.
Allowable (Compression) (kips/in²)
Initial: Maximum allowable compressive stress immediately after prestress transfer.
Sustained: Maximum allowable compressive stress under sustained loading conditions.
Total: Maximum allowable compressive stress considering the total service load condition.
Allowable (Tension) (kips/in²)
Initial: Maximum allowable tensile stress immediately after prestress transfer.
Sustained: Maximum allowable tensile stress under sustained loading conditions.
Total: Maximum allowable tensile stress considering the total service load condition.
OK: Save the design code options and allowable stress limits.
Close: Close the dialog without/after modifying the current settings.