STAAD.Pro Help

D. ACI 318-05 and 318M-05 Beam Brief dialog

The ACI 318-05 Beam Design Brief has the following tabs for setting out the design parameters:

Note: Units used are dependant on the unit system (U.S. Customary or Metric) brief selected. Otherwise, the briefs are identical.

General tab

SettingDescription
Minimum Cover Set the cover to the top, bottom and sides of the beams.
Strength fc' The specified compressive strength of the concrete.
Aggregate Size The maximum aggregate size used.
Lightweight

Select this option if a lightweight aggregate concrete is used. Specify either the average splitting tensile strength of the lightweight concrete value, Tensile fct, (if known) or the Lightweight Factor (by which √fc' is multiplied, for when Tensile fct is not known) by selecting the appropriate option.

The Unit weight of the lightweight concrete must also be specified.

Include Torsion Effects Select this option to consider torsion in the design of the reinforcement.
Design moment at support Select whether the design section should be taken at the face or center-line of the support.
Envelope The beams will be designed to the forces from the envelope selected from the pull-down list.  Load Envelopes are added using the Define Envelope dialog.
Divide Beam Set the minimum number of segments that each member should be divided into for calculating the reinforcement (must be at least four).

Main Reinforcement tab

SettingDescription
Top Bar Criteria

Set the Minimum and Maximum allowable bar sizes to be used on the top of the beams. The link hanger size is used for detailing where no reinforcement bars are required for bending, but bars are required for supporting links.

The Min gap defines the spacing between the top 2 layers.

Bottom Bar Criteria

Set the Minimum and Maximum allowable bar sizes to be used on the bottom of the beams.  The link hanger size is used for detailing where no reinforcement bars are required for bending, but bars are required for supporting links. 

The Min gap defines the spacing between the bottom 2 layers.

Side Bar Criteria

Set either the minimum bar size to be used or let the program calculate which bars can be used to achieve a suitable spacing on deep beams.

Main Bar

Specify the steel strength and whether the steel is epoxy coated.

Select whether the development length is defined from cl 12.2.2 or cl 12.2.3.

Click the Bending Dimensions… button to open the Bending Dimensions dialog, which is used to specify bending dimensions for each bar size.

Note: Bar sizes include: #3, #4,#5, #6, #7, #8, #9, #10, #11, #14, #18

Shear Reinforcement tab

SettingDescription
Design Shear For

Select the option to design the shear reinforcement up to the Center Line of Column (support), Column Face (edge of support), or the distance 'd' from the Column Face.  Note that the column or support face is defined in the Spans Table.

Select whether to Include Axial Load Effects in the longitudinal reinforcement.

Shear Bar Criteria

Specify the Bar Strength to use for shear reinforcement.

The bar size to use from the pull-down list of available sizes.

The minimum number of shear legs, 2, 3, 4, 5 or 6.

The minimum spacing between links to consider, if a smaller distance is required, then the number of legs will be increased.

Set whether the stirrups are defined as Closed or Open for the schedule.

Click the Bending Dimensions… button to open the Bending Dimensions dialog, which is used to specify the bending dimensions for each bar size.

Note: Bar sizes include: #3, #4,#5, #6, #7, #8, #9, #10, #11, #14, #18
SettingDescription
OK Accepts parameters on all dialog tabs and closes the dialog.
Cancel Closes the dialog without saving any changes.
Apply Saves changes made in the dialog. Only available if changes have been made.
Help Opens the STAAD.Pro help window.