Check Tensile Stress for Prestressing Tendons
Check the tensile stresses for prestressing tendons in a spreadsheet format table. The entries in the table are displayed in red for the tendon profiles if the stress limits are exceeded.
Table Tool in midas Civil offers a variety of powerful built-in functions. Refer to Usage of Table Tool for detail directions.
From the Main Menu select PSC > PSC Design Result Table > Check Tensile Stress for Prestressing Tendons.
Upon executing the PSC Design Result Table > Check Tensile stress for Prestressing Tendons, Records Activation Dialog prompts. Click .jpg){kind=small}
after entering the tendons.
Refer to Usage of Table Tool and check the following data:
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Tendon: Tendon profile name.
For Post-tensioned:
FDL1: Stress in tendon at anchorages.
FDL2: Maximum stress in tendon along the length of the member away from anchorages, immediately after anchor set.
FLL1: Maximum stress in tendon after all losses at the last stage.
AFDL1: Allowable Stress in Tendon immediately after anchor set at anchorages.
AFDL2: Allowable Stress in Tendon immediately after anchor set elsewhere.
AFLL1: Allowable stress in tendon at service limit state after losses.
When CSA-S6S1-2010 is selected, Minimum effective prestress.
For Pre-tensioned:
FDL1: Stress in tendon.
FDL2: -
FLL1: Maximum stress in tendon after all losses at the last stage.
AFDL1: Allowable Stress in Tendon prior to transfer.
AFDL2: -
AFLL1: Allowable stress in tendon at service limit state after losses.
When CSA-S6S1-2010 is selected, Minimum effective prestress.
Note 1. Stress limit for AASHTO LRFD (2012)
When AASHTO LRFD (2012) is selected, allowable stress limit for prestressing tendon is determined as specified in the table 5.9.3-1 of AASHTO LRFD (2012). The value of specified tensile strength of prestressing steel (fpu) and the yield strength of prestressing steel (fpy) is specified in Tendon Property.
|
Condition |
Tendon Type |
||
|
Stress-Relieved Strand and Plain High-Strength Bars |
Low Relaxation Strand |
Deformed High-Strength Bars |
|
|
Pretensioning |
|||
|
Immediately prior to transfer (AFDL1) |
0.70fpu |
0.75fpu |
fpu* |
|
At service limit state after all losses (AFLL1) |
0.80fpy |
0.80fpy |
0.85fpy |
|
Post-Tensioning |
|||
|
At Anchorage and couplers immediately after anchor set (AFDL1) |
0.70fpu |
0.70fpu |
0.70fpu |
|
Elsewhere along length of member away from anchorage and coupler immediately after anchor set (AFDL2) |
0.70fpu |
0.74fpu |
0.70fpu |
|
At service limit state after losses (AFLL1) |
0.80fpy |
0.80fpy |
0.80fpy |
* In midas Civil, tendon tensile stress at immediately prior to transfer (AFDL1) in deformed high-strength bars is applied as fpu. In AASHTO LRFD, no limit value is provided in this condition.
Note 2. Stress limit for CSA-S6S1-2010
When CSA-S6S1-2010 is selected, allowable stress limit for prestressing tendon is determined as specified in the table 8.2 of CSA-S6S1-2010. The value of specified tensile strength of prestressing steel (fpu) and the yield strength of prestressing steel (fpy) is specified in Tendon Property.
|
Condition |
Tendon Type |
||
|
Low Relaxation Strand |
Smooth High Strength Bar |
Deformed High Strength Bar |
|
|
Pretensioning |
|||
|
At transfer (AFDL1) |
0.74fpu |
0.74fpu* |
0.74fpu* |
|
Minimum effective prestress (AFLL1) |
0.45fpu |
0.45fpu |
0.45fpu |
|
Post-Tensioning |
|||
|
At transfer, At Anchorage and couplers (AFDL1) |
0.70fpu |
0.70fpu |
0.66fpu |
|
At transfer, Elsewhere (AFDL2) |
0.74fpu |
0.70fpu |
0.66fpu |
|
Minimum effective prestress (AFLL1) |
0.45fpu |
0.45fpu |
0.45fpu |
* In midas Civil, tendon tensile stress at transfer (AFDL1) in smooth and deformed high-strength bars is applied as 0.74fpu. In CSA-S6S1-2010, no limit value is provided in this condition.