Function
Assigns service load combinations for post-tensioned slab serviceability checks. The selected load combinations are categorized as Initial, Sustained, and Total loading conditions for stress and serviceability evaluation.
Call
From the Main Menu
select [Post Tension] tab > [Design] group > [Design Parameters] > [Serviceability Load Combination]
Input
Load Combinations: Displays the list of load combinations defined in the model and available for serviceability evaluation.
Initial Load
Represents the load condition immediately after prestress transfer, before the occurrence of time-dependent effects such as creep, shrinkage, and prestress losses.
Load Combination
1.0 D + 1.0 PTI
Sustained Load
Represents the long-term service condition considering creep, shrinkage, and prestress losses.
Load Combinations
1.0 D + 1.0 PTL
1.0 D + 0.3 L + 1.0 (PTL)
1.0 D + 0.5 L + 1.0 (PTL)
Total Load
Represents the maximum service load condition with all applicable service loads acting simultaneously.
Load Combination
1.0 D + 1.0 L + 1.0 (PTL)
Notation
D (Dead Load): Self-weight and dead load
L (Live Load): Live load
PTI (Initial Prestress Force): Initial prestress force immediately after stressing
PTL (Long-term Prestress): Effective prestress reflecting long-term losses
Move Right (→): Transfers the selected load combination from the available load combination list to the selected loading condition category.
Move Left (←): Removes the selected load combination from the assigned loading condition category and returns it to the available load combination list.
OK: Save the serviceability load combination assignments.
Close: Close the dialog without applying changes.