PSC Bridge - Tendon Template

Function

• Define a tendon template along the length of elements. Create the tendon profile relative to its own coordinate system, which will then be inserted relative to the elements. Standard Tendon Layout can be easily input using tendon templates .

Tendon location is applied in Element Coordinate System.

Call

From the main menu [Structure] tab > [PSC Bridge] group > [PSC Bridge Option] > [Tendon Template]

Input

Tendon Template dialog box

Use Prefix Name

The Prefix Name is provided for the convenience of automatic generation of tendon names when using the tendon templates.

Assigned Elements

Specify the elements to which the tendon will be assigned. Assigned Elements are connected to each other and have the same local direction. Use the Graphical Selection functions of midas Civil to automatically specify the elements by selecting them on the screen.

Add: Add the selected elements(on the left) to a list of element groups(on the right) for tendons to be assigned to. A separate set of tendons will be assigned to each set of elements.

1 It is useful when we define a tendon in several girder elements with the same profile.

2 It is only available for elements with the same cross-section.

Tendon Template

Add: Click to enter new or additional tendon placement in the Tendon Template dialog box.

Modify: Select the tendon template to be modified from the list in the Tendon Template dialog box and click [Modify] button to modify the related data.

Delete: Select the tendon template to be deleted from the list in the Tendon Template dialog box and click [Delete] button to eliminate a previously defined tendon template.

Set Property: Change Tendon property, Tendon group, and Reference Axis assigned to a number of Tendon templates at the same time.

  If there are a number of templates, which are required to have Tendon Properties changed, this functionality allows us to change them simultaneously, rather than changing them one by one in each template.

Move/Copy: Move or Copy the previously entered Tendon Templates.

Offset dy: Relative distance to Move/Copy in the element y direction

Offset dz: Relative distance to Move/Copy in the element z direction

Num. of Times: Number of repetitions when using Copy Mode

Import: Open a TDT file containing the Tendon template data to import a Tendon Template.

Export: Tendon template can be exported to “*.tdt” file format.

Use Ratio (h1, h2): Consider h, h1 and h2 values as a ratio.

Auto Generation: Use the tendon template based on standard precast sections to automatically generate tendons in elements. The Auto Generation function provides the tendon databases for the following section types:

Reset Name: To initialize and renumber the tendons in the tendon table using the Name Prefix and available numbers.

Auto Generation Details

Name prefix: Name is provided for the convenience of automatic generation of tendon names.

Tendon Property: Define the tendon properties such as tendon area and instantaneous prestress losses.

Tendon Group: Define Tendon Group names to which specific tendons are later assigned.

Code: Select the country code of prestressed precast section.

Type: Select the type of prestressed precast section.

Name: Select the specific prestressed precast section.

If the Assigned Elements selected have one of the database sections, the Code, Type and Name of the tendon database is automatically selected in the Auto Generation function.

If the Assigned Elements do not have one of the database sections applied, the Code, Type and Name are set as the default setting. Different Code and Type may be selected and different Name may be assigned.

Origin Point: Reference point for the automatic inputting of tendons. The default position of the Origin Point is the left bottom corner of the section.

Reset Name : To initialize and renumber the tendons in the tendon table using the Name Prefix and available numbers.

Add/Modify Tendon Templates

Add/Modify Tendon Templates dialog pops up when [Add] or [Modify] is clicked.

Tendon

A preview of the tendon profile is displayed in the assigned elements.

Pos : I, J

Select the position for which the cross section data of the element with tendon is to be displayed

  If a Tendon template is selected from the Tendon template List, the tendon placement is displayed in the Plan view, Elevation view and Section views.

Tendon Name: A name is chosen automatically based on the previously defined tendons using the "Use Prefix Name". If the Use Prefix Name is checked on, the Tendon name is shown as read-only.

Group: Define Tendon Groups. Once Tendon Groups are defined, coordinates, stresses and prestress losses of tendons can be checked by Tendon Groups. Click [...] button to the right to add new, modify or delete previously defined Tendon Groups.

Tendon Property: Define the tendon properties. Click [...] button to the right to add new, modify or delete previously defined tendon properties.

Horiz. Offset(Begin): Enter a numeric value to specify the distance from the left edge of the specified span to the location of the beginning of the tendon.

Horiz. Offset(End): Enter a numeric value to specify the distance from the left edge of the specified span to the location of the end of the tendon.

Tendon Type: Select a tendon shape. The tendon type is arranged by each span.

Tendon Type is arranged by each span.

Same span info: If checked on, the same span information is applied to every span, and only 1 row of span information is shown in the table.

Num. Of Span: The number of spans

Span Length: Enter the span lengths for the tendon. This option is read-only when “Same Span Length” is checked on.

Invert Profile: Tendon Profile is flipped upside down.

1  The tendon length is calculated based on the element length.

2  If span information is already defined (Structure > Wizard > PSC Bridge > Span Information), the span length is taken from the girder information.

Reference Axis

Curve: The x-direction (the reference line from which tendon coordinates are defined) of TCS for tendon placement is considered as a curved line.

Element: Tendon location is converted into Element Coordinate System and applied.

  Tendon template profile is defined as Element type by default. If the selected elements are not in a straight alignment, Curve type can be selected.