Type 1
Define the second phase tendons placed in the webs of a PSC box section. Tendons are defined for a single web, which are applied symmetrically. If 2 Cell is used, the tendons are placed also in the middle web by horizontal projection.
Web Tendon dialog box (Type 1)
Type
Select the type of tendon placement in the longitudinal direction.
None
No tendons are placed.
Type1, Type2
No tendons are placed.
Tendon Property
Define the tendon type. Click the button to the left of the selection field to prompt the "Tendon Property" dialog box to add, check or modify the tendon properties.
1st Tendon
Select the type of web tendon placement. If Type 1 is selected, specify the type of tendon to be placed at the upper most layer. If Type 2 is selected, the 2nd tendon is assumed to be equal to the 1st tendon.
2nd Tendon
Assign the type of tendon to be placed at the mid layer. The entry is valid only if Type 1 is selected.
3rd Tendon
Select the type of web tendon to be placed at the lower most layer. The entry is valid only if Type 1 is selected.
Jacking Stress
Specify the tensioning stress for the web tendons.
Su
Ultimate tensile strength of tendons
Sy
Yield strength of tendons
Position
Define the location of tendons to be placed in the web of a PSC box section.
Ey, Theta
Define the plane in which the 2nd phase tendons are placed referring to the guide diagram to the right in the dialog box.
H, G1, G2
Referring to the guide diagram, enter the dimensions required to define the layout of the tendons in the longitudinal direction.
The dimensions, a and b, in the input description diagram represent the zones of straight tendon placement at the anchorage and are specified if Type 2 is selected.
The tendon placement may also be defined by the "Tendon Profile" function.
Grouting
Once the ducts are grouted, the transformed section properties are subsequently considered. The input signifies the timing of incorporating the transformed properties.
Prestressing step
Grouting takes place at the time of tensioning the tendons.
Every n Stage
Grouting takes place at every n stages. If n=1is entered, the grouting is assumed to take place at the next stage after the corresponding tendons are stressed. If n=2 is entered, the grouting is assumed to take place at the third stage after the two corresponding segments have been stressed.
Cell Type
Define the web tendon placing method by specifying the number of cells (webs) of the PSC box section.
1 Cell
PSC box with a single cell section.
2 Cell
PSC box section with two cells.
Type 2
Define the layout of straight or curved tendons by entering the distances from the top and bottom of the girder, the angle of inclination of the tendons and the radii of curvature at inflection points.
Web Tendon dialog box (Type 2)
Type
Select the type of tendon placement in the longitudinal direction.
None
No tendons are placed.
Type1, Type2
Refer to the diagram to the left.
Tendon Property
Define the tendon type. Click the button to the left of the selection field to prompt the "Tendon Property" dialog box to add, check or modify the tendon properties.
1st Tendon
Select the type of web tendon placement. If Type 1 is selected, specify the type of tendon to be placed at the upper most layer.
2nd Tendon
Assign the type of tendon to be placed at the mid layer. The entry is valid only if Type 1 is selected.
3rd Tendon
Assign the type of tendon to be placed at the mid layer. The entry is valid only if Type 1 is selected.
Grouting
Once the ducts are grouted, the transformed section properties of tendon and grouting are subsequently considered. The input signifies the timing of incorporating the transformed properties or the timing of grouting tendons.
Number of Cell
Number of Cells of PSC Box Section defined in Section tab.
Symmetric
Select this option when the web tendons at each side are symmetrical.
Eyi
Enter the horizontal distance from the center of the section to the center of the web. As shown in the guide diagram above, the offset point located to the left is taken as positive and the right is taken as negative. The (-) sign is used only if the section is non-symmetrical.
θi
Enter the angle of inclination of the web tendons. The sign convention is illustrated in the figure below.
ai
Enter the horizontal distance from the web center to the tendon. If the tendon is located to the left of the web center, the sign is negative. The right side is given a positive sign.
G1~G4, C1~C3, R1~R3, S1,~S4, Theta1~Theta2
Referring to the guide diagram, enter the dimensions required to define the tendon layout.
In case where tendon layout cannot be defined:
As shown in the figure below, when the tendons are overlapped because of large curvature radii, the tendon layout cannot be defined.
Open...
Open the data saved as in the *.wzd file type in the ILM Model Wizard. By using this function, we can re-execute midas Civil and subsequently check and modify the previously entered data within the Wizard.
Save As...
Save the data entered in the ILM Model Wizard as the *.wzd file type.