STAAD.Pro Help

D. EHE Column Design Brief dialog

The EHE 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).

Available concrete grades include: C25, C30, C35, C40, C45 and C50

Aggregate Size Specify the maximum aggregate size.
Cover Specify the cover to the shear reinforcement.
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: B220S, B400S and B500S.

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 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.

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

Column Factors tab

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

Select value used in clause 43.5.2 from either 0.003 or 0.004'.

Effective Length Factors Specify the effective length factors to be used in the local y-y and z-z directions.
Starter bars Specify the area of starter bar steel (in mm2) to ensure that maximum area of steel is not exceeded by the design.
Spacing values Specify Maximum allowable spacing between main bars (in mm).

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

Boxed Values - Main tab

SettingDescription
Partial safety factors Specify the partial safety factors for concrete, gamma(c) and steel, gamma(s). 
Sustained compression factor Specify Sustained compression factor for rectangular and circular columns.
Reinforcement Percentages Specify Percentage of reinforcement limits for both Minimum and Maximum values.
Minimum no. of bars in a circular section Specify Minimum number of bars to be used in a circular column.
Minimum transverse dimension of section Specify Minimum transverse dimension of section (in mm).
Upper slenderness limit for model column method Specify 'Upper slenderness limit for model column method.
Bar spacing options Select options for limiting spacing of bars to include:
  •   Maximum bar diameter
  •   Specified dimension (in mm).

Boxed Values - Shear tab

SettingDescription
Min. diameter of links Specify Minimum diameter of link bars (in mm). and limiting fraction of diameter of longitudinal bars. 
Link spacing options Select option for minimum spacing of links do not exceed lesser of:
  • Multiple of longitudinal bar diameters, specify the number of diameters.
  • Least dimension of the column.
  • Maximum distance, specify the distance (in mm).
Clause 44.2.3.2.1 Specify the values used in calculating the constant k, the average stress in the concrete due to axial force,

Specify the value of sigma(cp).

Specify the value rho(1),  maximum value of the reinforcement ratio corresponding to the area of reinforcement effective at the section under consideration.

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.