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D. NS 3473 Column Design Brief dialog

The NS 3473 Column Design Brief has the following tabs for setting out the design parameters:

General tab

SettingDescription
Concrete Specify the concrete strength either from the available concrete grades or by defining a concrete strength, fck, (in N/mm2).

Specify the maximum aggregate size.

Specify the cover to the shear reinforcement.

Available concrete grades include: C25, C35, C45, C55, C65, C75 and C85

Main Bars Specify the strength of steel to be used for the main bars either from the available steel grades or by specifying the steel yield strength to be used.  If a user strength is defined, then the appropriate bar bending dimensions need to be specified.

Specify the minimum and maximum bar sizes to be used.

Available steel grades include: B400, B500 and B600.

Links Specify the strength of steel to be used for the shear reinforcement bars either from the available steel grades or by specifying the steel yield strength to be used.  If a user strength is defined, then the appropriate bar bending dimensions need to be specified.

Specify the minimum bar size to be used from 6, 8, 12, 16 or 20.

Available steel grades include: B400, B500 and B600.

Unless stated otherwise, the range of available bars sizes includes: 12, 16, 20, 25, 32 and 40.

Column Factors tab

SettingDescription
Slenderness Factors This may be set to 1, or calculated by the design.

Specify Creep coefficient

For long term loads, specify Longitudinal Force (in kN) and First order moment (in kNm)

Effective Length Factors Specify the effective length factors to be used in the local y-y and z-z directions.
Area provided by starter bars Specify the area of starter bar steel (in mm2) to ensure that maximum area of steel is not exceeded by the design.

Specify Maximum allowable spacing between main bars (in mm).

Specify Minimum allowable spacing between link bars' (in mm).

Boxed Values - Main tab

Specify Partial safety factors for Concrete, Gamma(c) and Steel, Gamma(s).

Specify Sustained compression factor for rectangular and circular sections.

Specify Reinforcement percentages both minimum and maximum values.

Specify Minimum number of bars to be used in circular columns

Specify Minimum transverse dimension of section (in mm)

Specify Upper slenderness limit for model column method

Specify Minimum spacing of bars on top of 2x bar limit.

Boxed Values - Shear tab

Specify Minimum diameter of link (in mm) and fraction of diameter of longitudinal bars.

Select whether options to limit spacing of links as:

  • a user number diameters of longitudinal bar diameters.
  • the least dimension of the column.
  • a user dimension.
SettingDescription
Equation 4.18

Specify a value to use in k factor equation, with a lower limit

Specify sigma(cp)

Specify Maximum value of rho(1)

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.