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Use L+0.5D for deflection
When the setting is checked, then the deflections calculated for for only the load combination D + L are calculated with the dead load component multiplied by 0.5. The reaction, shear, and bending are not affected for the D + L load combination.
All other load combinations, such as D + 0.75 (L + S), remain unchanged; the full dead load is used for deflections in those members.
.7W for C&C wind loads
When the setting is checked, the deflection results for all load combinations containing a wind component are calculated with a 0.7 factor multiplied to the factor that is currently applied to the wind component (either 0.75 or 1).
Other results including reaction, shear, and bending are unaffected.