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D. DIN 1045 Beam Design Brief dialog

The DIN 1045-1 Beam Design Brief has the following tabs for setting out the design parameters:

General 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.
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.

Materials tab

SettingDescription
Main Bar Type Either select a standard grade from the pull-down list or enter the steel yield strength, fyk (in N/mm2) into the user value and set the bending dimensions to be used with that strength as well as a factor to define ftk as a multiple of fy and the ultimate strain.

The available steel grades include: >BSt 500 S(A), BSt 500 M(A), BSt 500 S(B) and BSt 500 M(B)

Concrete Grade Either select a standard grade from the pull-down list or enter the concrete strength, fcu, into the user value (in N/mm2).

If a user strength is defined, then the maximum Elastic Strain and Ultimate Strain must also be defined.

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

Aggregate Size Specify the maximum size of aggregate used in the concrete mix (in mm).

Select whether the stress strain relationship should use the Idealised or Slant chart in Ref Bild 27.

Durability tab

Exposition Class

  • Select option for Reinforcement Corrosion, activated by carbonate influences, either X0, XC1, XC2, XC3 or XC4.
  • Select option for Reinforcement Corrosion, activated by Chlorides, except sea water, either Not Applicable, XD1, XD2 or XD3.
  • Select option for Reinforcement Corrosion, activated by sea water chlorides, either Not Applicable, XS1, XS2 or XS3.
  • Select option for Attack risk by frost with or without de-icing chemicals either Not Applicable, XF1, XF2 or XF3.
  • Select option for Attack risk by chemical attack by the environment either Not Applicable, XA1, XA2 or XA3.
  • Select option for Concrete Attack by abrasion strain, either 'Not Applicable, XM1, XM2 or XM3.
  • Select option for Fire Resistance Grade as per DIN 4102, either F30-B or F90-A
  • Specify Reduction over C(min) for higher grade (in mm)

The result of these selections will define the concrete cover, C(min), delta(c) and C(nom) and will suggest the minimum concrete grade that will be required for the design.

Shear Reinforcement tab

SettingDescription
Design Shear For Select whether the design of shear force is taken to the face of the column (support) by selecting Use shear at support face or Use shear at a distance d from the support face to account for the enhanced shear effects close to the support.

Select option Design for torsion to account for the torsion forces in the beam.

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: BSt 500 S(A), BSt 500 M(A), BSt 500 S(B) and BSt 500 M(B)

Note: Unless stated otherwise the available bar sizes include: 6, 8, 10, 12, 14, 16, 20, 25, 28, 32, 35 and 40

Arrangement tab

Specify The 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 (in number of diameters)

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 d(g)+5mm when d(g) > 16mm

Serviceability tab

SettingDescription
Equation 127, Clause 11.2.2
  • Specify Value for k factor
  • Specify Value for f(ct,eff) (in N/mm2)
  • Specify sigma(s) (as percentage of f(yk))

Specify Allowable crack width limit for calculation of maximum allowable spacing (in mm)