Permissible Stress Factors
Modify the permissible stress factors by clicking the Edit Factors button on the Permissible Stress tab. This activates the Permissible Stress Factors dialog box, as shown in Figure below.
Edit the values as required and click the OK button to accept the changes. The program automatically returns to the Design Parameters/Permissible Stresses tab. Remember, the Use Factor To Calculate check box must be selected in order for the program to update the permissible stresses.
| Setting | Description |
|---|---|
| Deflection Multipliers |
As specified in the PCI Design Handbook (Fifth Edition), long-term deflections for a prestressed beam are obtained by multiplying short-term deflections with specified factors. Precast/Prestressed Girder follows this same approach. Refer to the PCI Design Handbook (Fifth Edition) for a list of such factors for different loads. |
| Length Multipliers |
Length multipliers are used to calculate the development length and transfer lengths for bonded and debonded strands, where bonded strands are strands that have no debonding (not shielded). |
| Transfer - Bonded | The calculated transfer length is multiplied by this number to obtain the transfer length for bonded strands. |
| Transfer - Debonded | The calculated transfer length is multiplied by this number to obtain the transfer length for debonded strands. |
| Development - Bonded |
The calculated development length is multiplied by this number to obtain the development length for bonded strands. |
| Development - Debonded |
The calculated development length is multiplied by this number to obtain the development length for debonded strands. |