Question:

COMPRESS uses only 60% of the weight for determining the tensile force in the anchor bolts when designing a vessel using the ASCE 7-05 Code. What is the reason for not using 100%?

Answer:

The factor 0.6 is from the ASCE 7 load combinations that include wind or seismic. By default, COMPRESS will consider load combinations 7 and 8 of ASCE 7-05, etc, paragraph 2.4. These load combinations are specified with reduced dead load in combination with full wind and seismic bending moments.

COMPRESS allows the Engineer to override these load combinations if desired. Access the Action menu then select the Set Mode Options command. Select the Calculation tab on the Set Mode Options dialog and "check" the option labeled "Do Not Consider ASCE Load Combinations 7 and 8" then click "OK". See below: