Stirrups Dialog Box

This dialog box assists you in designing a stirrup layout that satisfies design requirements. To open this dialog box, click the Stirrup button on the Design tab. The reinforcement requirements displayed are estimated based on the design parameters specified. To ensure that the stirrup layout developed satisfies all specification requirements the user must re-run the analysis after copying the stirrup design to the model and verify the design by viewing the Design Results. The user must review all defined load combinations to determine the controlling load combination to be used for design.

Adding Stirrup Rows

Perform the following steps to add a stirrup row:

Select the girder section you want to modify from the drop-down list in the Girder field.
In the grid, select the stirrup you want to add to by clicking anywhere in its row. A blue arrow displays on the left side of the grid to mark the selection.
Click the Add Stirrup button. This adds a new stirrup row after the selected one.
Enter the stirrup row values in the grid. A definition for each parameter is available below.

Deleting Stirrup Rows

Perform the following steps to delete a stirrup row:

Select the girder section you want to modify from the drop-down list in the Girder field.
In the grid, select the stirrup row you want to delete. A blue arrow displays on the left side of the grid to mark the selection.
Click the Delete Stirrup button to remove the selected row.

Copying Stirrup Row Values to All Girders

In many cases, several similar rebar exist in all girders. The Copy to All Girders command is used to create a duplicate of the selected rebar in every girder to simplify the definition of similar rebar.

Select the girder section you want to modify from the drop-down list located in the Girder field.
In the grid, select the stirrup row you want to copy. A blue arrow displays on the left side of the grid to mark the selection.
Click the Copy to All Girders button to copy the selected row to every girder.

Grid Definitions

Setting

Description

Girder

The girder to which the stirrup applies.

Number of Legs

Enter the number of stirrup legs needed.

Stirrup Size

Select the bar size from the drop-down list. The bar size name refers to a rebar material definition loaded from the Rebar Library. Rebar material definitions include specification of: unit type, yield stress (fy), ultimate stress (fu), modulus of elasticity, deformed diameter, and area. The Rebar Library can be found under the Libraries menu. Rebar material definitions must be added and deleted from the Rebar Library. An additional rebar size unknown is provided. Use the unknown size to enter the rebar area directly.

Stirrup Area

Displays the total area of stirrup legs for this row if a stirrup size is used. Enter the total area of stirrup legs for this row for an unknown size.

Stirrup Spacing

Enter the spacing of the stirrups.

Reference Type

Select the reference type from the drop-down list.

Setting	Description
Span	Stirrup starting and ending locations are to be specified with respect to spans. Spans are defined as the distance between supports (piers or abutments) except that the first span is defined as starting at the BB and the last span ends at the EB.
Support	Stirrup starting and ending locations are to be specified with respect to supports (i.e. abutments or piers).
Bridge	Stirrup starting and ending locations are to be specified with respect to the beginning of the bridge or girder.
Continuous	Stirrups are continuous from the beginning to the end of the bridge or girder.

Ref Num

Reference number when specifying locations by Span or Support. This field will be disabled for the Bridge and Continuous location methods.

Ref Unit

Click to define the starting and ending Stirrup locations as either a percentage or as a distance in the current units.

Ref Start Distance

Enter the Stirrup starting location.

Ref End Distance

Enter the Stirrup ending location.

Technical Discussion

CIP RC/PT Girder’s stirrup design dialog is provided to assist the user in determining an efficient layout of shear stirrup reinforcement that satisfies the design specifications. In general, the design process involves estimating the required area/spacing of reinforcement for a specified load