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D. NS 3473 Beam Design Brief dialog

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

General tab

SettingDescription
Minimum cover Set the cover to the top, bottom and sides of the beams (in mm).
Aggregate Size Maximum size of aggregate to be used (in mm)
Concrete Grade Set the strength either from the list of available grades, or by defining a cube strength, fck (in N/mm2).

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

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.

Main Reinforcement tab

SettingDescription
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 mm) 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 mm) 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 Either select a standard grade from the pull-down list or enter the steel yield strength into the user value and set the bending dimensions to be used with that strength.

The available steel grades include: B400, B500 and B600

Note: Unless stated otherwise, the available bar sizes include: 6, 8, 10, 12, 16, 20, 25, 32, 40 and 50

Shear Reinforcement tab

SettingDescription
Design Shear For Select whether or not to include for the shear forces within the width of the column (or support) by selecting either center Line of Support or Column face (support).

Select Include Axial Load Effects to account for the axial forces in design of longitudinal reinforcement

Shear Bar Criteria Select the minimum bar size and number of legs (2, 3, 4, 5,or 6) to be used and set the minimum spacing (in mm).  If the design requires a smaller spacing, then the number of legs will be increased.
Shear Bar Type Either select a standard grade from the pull-down list or enter the steel yield strength into the user value (in N/mm2) and set the bending dimensions to be used with that strength.

The available steel grades include: S400 or S500

Note: Unless stated otherwise, the available bar sizes include: 6, 8, 10, 12, 16, 20, 25, 32, 40 and 50

Boxed Values - General tab

SettingDescription
Design Factors Specify partial safety factors for Concrete, Gamma(c) and Steel, Gamma(s)

Specify additional factor for sustained compression, alpha

Limit for maximum percentage of tension and compression reinforcement (as %)

Equation 4.78 Specify values for k factor, f(ct eff) (in N/mm2) and sigma(s) (as %)
Bar Spacing Set the minimum spacing of bars (in mm) to be used on top of the 2x bar size limit.

Boxed Values - Anchorage & Slender tab

Specify Overall depth of section limit for good anchorage bond (in mm)

Specify Minimum distance from top surface for good anchorage (in mm)

Specify Minimum anchorage length (in mm)

Specify Side cover limit relating to alpha(a) coefficient (as diameter)

Specify Compression flange length factor limit for EC2 Eq. 4.77

Specify Compression flange breadth factor limit for EC2 Eq. 4.77'

Boxed Values - Shear tab

Specify Maximum diameter of links (in mm)

Specify Maximum longitudinal spacing of links when VSd <= 2/3 VRd2 (in mm)

Specify Maximum longitudinal spacing of links when VSd > 2/3 VRd2 (in mm)

Specify Maximum transverse spacing of links (in mm)

Specify Upper limit of beta used for shear enhancement

Equation 4.18

  • Specify k to be used and limit of k-d
  • Specify sigma(cp)
  • Specify 'Maximum value of rho(1)