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D. IS456 Beam Design Brief dialog

The IS456 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).
Minimum Reinforcement Spacing. Specify the Minimum (in mm)
Beam Design option. Select either 'Vertical Bending and Shear' or 'Lateral Bending and Shear'
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: M20, M25, M30, M35 and M40

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.
Design for Torsion Select whether the beam should include the design for torsion.
Check for IS 13920

Select this option to instruct the program to perform additional seismic checks per IS 13920 for the main bars.

Note: Select the Earthquake page to check for collapse and shear criteria.

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: Fe250, Fe415 and Fe500

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

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 'Enhanced Shear Effects' to account for changes in shear angle when approaching a column (support) face.

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.

Select if the links are to be detailed as Closed or Open.

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: Fe250, Fe415 and Fe500

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

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