D. ACI 318-99 Beam Brief dialog
The ACI Beam Design Brief has the following tabs for setting out the design parameters:
|Minimum Covers||Set the cover to the top, bottom and sides of the beams (in inches).|
|Concrete||Set the strength (in ksi), maximum aggregate size (in inches) and option to use lightweight concrete, in which case either the Tensile fct should be defined (in ksi) or the Lightweight Factor as a fraction.|
|Forces||Set the option whether the torsion forces should be designed for and whether the design 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
|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 (in inches) 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 (in inches) 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 Type||
Specify the steel strength (in ksi) 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.
Shear Reinforcement tab
|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 (in ksi)
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.