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D. DIN 1045 Column Design Brief dialog

The DIN1045-1 Column Design Brief has the following tabs for setting out the design parameters:

General tab

SettingDescription
Concrete Specify the concrete strength,fck , either selected as a standard grade or as a user specified value (in N/mm2).

Available concrete grades include: C12/15, C16/20, C20/25, C25/30, C30/37, C35/45, C40/50, C45/55, C50/60, C60/75, C70/85, C80/95, C90/105 and C100/115

Specify the maximum aggregate size used in the concrete mix (in mm)

Specify the cover to the shear reinforcement (in mm)

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 (in N/mm2).  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: BSt 500 S(A), BSt 500 M(A), BSt 500 S(B) and BSt 500 M(B)

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 (in MPa).  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, 10, 12, 14, 16 or 20.

Available steel grades include: BSt 500 S(A), BSt 500 M(A), BSt 500 S(B) and BSt 500 M(B)

Unless stated otherwise, available bar sizes include: 12, 14, 16, 20, 25, 28, 32, 35 and 40

Column Factors tab

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

Specify Maximum spacing between main bars (in mm)

Specify Minimum spacing between link bars (in mm)

Set whether to Use second order theory when slenderness < critical slenderness

User Settings - Main tab

Specify partial safety factors for concrete gamma(c) and steel gamma(s).

Specify sustained compression factors for rectangular and circular columns

Specify Minimum and Maximum reinforcement percentages.

Specify Minimum number of bars to be used in a circular column.

Specify Minimum transverse dimension of section (in mm)

Specify Upper slenderness limit for model column method

SettingDescription
Limit for spacing bars Set options to include minimum spacing of bars not less than maximum bar diameter and/or user dimension (in mm) on top of the limit of dg+5mm when dg > 16mm

Boxed Values - Shear tab

Specify Minimum diameter of links (in mm) and fraction of diameter of larges longitudinal bar.

Select options to limit minimum spacing of links from the following:

  •  A multiple of the longitudinal bar diameter, specify the number for multiple.
  •  Least dimension of the column.
  •  A minimum distance, specify the distance (in mm).
SettingDescription
Clause 10.3.3 - Equation - 70

Specify value of σcd .

Specify limit for value of ρ1 .

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.

Concrete Stress Block tab

Select option to either calculate the stress block from Table 9 or a set of user values

If the Custom values option is selected, then the following must be specified:

  •   Ultimate strain limit of concrete (in millistrain)
  •   Elastic strain limit of concrete (in millistrain)
  •   Index of parabolic curve