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Excerpt
nameGirder Strand

3D Reference

Pretensioning strands generally applied to the precast segments. In OpenBrIM, to specify the segments creating a Support Line to specify the start and end portions of the segments is beneficial for defining inputs.

Girder: Select the girder that strands are applied. Pretension loads are distributed to the this structure.

Start Support Line: Starting support line for the precast segment.

Offset From Start Support/Insertion Point [ft]: Set the longitudinal offset from the Start Support Line, if applicable.

End Support Line: End support line for the precast segment.

Offset from End Support/Insertion Point [ft]: Set the longitudinal offset from the End Support Line, if applicable.

Strand Row Data: To view the inputs, click the three-dot menu, then select "Edit…". The description of the inputs is listed below.

Tendon Layout Tabular Strand Data

 

Reference Support LineInner strand spacing[in]

Select a reference support line.

Longitudinal Distance[ftHorizontal spacing between strands[in]

Set the station difference along PGL from Reference Support Line.

Transerverse Offset[ft]# of Strands

Set the transverse offset according to Section Reference Edge of Girder.

Vertical Offset[ft]Reference Edge

Set the vertical offset according to Section Reference Edge of Girder.

Radius[ftDistance to Reference Edge [in]

Set the point’s radius of curve.

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Properties

Material: Set the material for the strand.

Wobble Friction Coefficient [1/ft]: Pretensioning applications doesn’t include frictional losses that’s why this parameter has default zero value.

Curvature Friction Coefficient (1/rad): Pretensioning applications doesn’t include frictional losses that’s why this parameter has default zero value.

Jacking

Strand Type: Enter the strand type for the tendon. The strand type can be imported from the Properties section.

Jacking Method[Start/End/Start then End/ End then Start]: Specify the jacking method that is applied to the tendon. In the case of Girder Strand, start and end refer to downstation and upstation directions with respect to PGL.

Jacking Force From Start [kip]: Enter the start jacking force that is applied to the tendon. It must be specified, unless Jacking Method is selected End.

Jacking Force From End [kip]: End jacking force that is applied to the tendon. It must be specified, unless Jacking Method is selected Start.

FEA Settings

Load Dist. Elem. Type[FENodes/FELines]: This input affects the type of finite elements loads are distributed. FELines are used for beam elements.

Percent Loss(%): Set the percent loss for the long-term losses. This is an optional input. Users can leave this input as 0 and let OpenBrIM calculate the long-term losses using the CEB-FIB 1990 curve by running the time-dependent analysis. Alternatively, users can set an approximate value for the Percent Loss (%) to account for long-term losses, which will reduce the Jacking Force values of the tendon.