The Composite Reaction Factors setup window
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Options on this window are read-only . They tell you how this window has been set up for this Job in a full-featured SDS2 program .
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Also see :
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To open Composite Reaction Factors :
Method 1 : Home > Project Settings > Job > Design > Composite Reaction Factors .
Method 2 : In Modeling or the Drawing Editor , choose Settings > Job Settings > Composite Reaction Factors (classic), or use a keyboard shortcut , or click the icon.
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How reaction factors are used :
- Composite design only applies to beams on which the box for " Composite Design " is checked.
- Each line on the Composite Reaction Factors window represents instructions for a composite beam of a particular nominal depth.
- If an " Rx factor " other than ' 1 ' is entered for a particular " Nominal depth ," connection design in a full-featured SDS2 program will calculate the " Shear load " by calculating the " Beam design reaction " (as if the beam were a noncomposite section), then multiplying the results by the " Rx factor ."
- If ' 1 ' is entered for a particular " Nominal depth ," connection design will base its shear load calculations for that particular composite beam section exclusively on criteria entered under " Beam Composite Design " on the Design Settings window.
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Example :
- To " Beam design reaction " the user of a full-featured SDS2 program selects ' Uniform Allowable Load ' and enters a percentage of ' 60 '.
- For a W18x 50, steel grade 50, 28 ft span beam, connection design calculates a uniform allowable load of 70 kips . Per the choices made in the previous bullet point, it multiplies this total load by 60% to get a resulting value of 42 kips for the noncomposite beam reaction.
- Since the box for " Composite Design " is checked for this beam, connection design then looks to this window ( Composite Reaction Factors ) and finds a factor of ' 1.25 ' entered for the nominal depth 18. It then multiplies the previously calculated noncomposite beam reaction ( 42 ) by 1.25 and enters the resulting calculated value of 52.5 to " Shear load " on the Beam Review window.
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