STAAD.Pro Help

D. ACI 318-05 and 318M-05 Column Design Brief dialog

The ACI Column 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.

Materials tab

SettingDescription
Strength fc' The specified compressive strength of the concrete.
Aggregate Size The maximum aggregate size used.
Cover Specify the clear cover used outside the shear links.
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.

Main Bars

Specify the strength of the main bars, the range of sizes to consider from minimum to maximum sizes, and the bending dimensions.

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

Links

Specify the strength of the tie or spiral bars (links), the minimum size link to consider, and the bending dimensions.

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

For circular columns select whether the design should specify tie or spiral reinforcement.

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

Column Parameters tab

SettingDescription
Effective Length Factors Specify the effective length factors to be used in the local y-y and z-z directions.
Bracing Conditions Specify whether the columns are braced in the local y-y and/or z-z directions or, if not, the Stability Index Q value for that direction.
Sidesway Load Case Select whether a specific load case should be considered or the design load case should be used for causing sidesway.
Include Torsion Effects Select this option to consider torsion in the design of the reinforcement.
Design as Sway Frame Select this option if the frame(s) which include the column(s) are subject to sidesway.
Starter Bar Area Provided Specify the area of starter bar steel (in mm2) to ensure that maximum area of steel is not exceeded by the design.
βd Specify the sustained to total axial load value to use in the design as defined in Chapter 10 of ACI 318. This value is used to calculate the magnified moments for second order effects per section 10.11 and is dependant on the presences of sidesway.
Maximum spacing between main bars Specify a maximum center-to-center spacing to be used for the longitudinal bars.

Member Loadcases tab

Used to select load case results which are used for column design with this brief.

SettingDescription
Available list Contains all primary load cases and load combinations in the STAAD.Pro input file.
Selected list

Load cases and combinations the results of which will be used for the column design when this brief is used in a Design Group.

Tool icon Description
> Adds the load case(s) selected in the Available list to the Selected list.
>> Adds all load cases from the Available list to the Selected list.
< Removes the selected load case(s) from the Selected list.
<< Removes all load case(s) from the Selected list.
Note: By default, no load cases or combinations are selected.