Last Updated: 2023.56
Wind
Basic Wind Speed (V): corresponds to a 3-sec gust speed at 33 ft (10 m) above the ground in Exposure Category C. Will be affected by patching for Metric vessels, the conversion from old to current will be to multiply the old value by 0.2778 and then round up to the nearest whole number. Units on form will be mph in Customary and m/s in Metric.
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Fa: short-period site coefficient (at 0.2 s-period). The greater of this value or that returned from tables in the referenced code will be used. Note that some cases for Site Class E and F do NOT have values in the codes, so it is critical that a value is input in these cases. This value is not used for ASCE 7-22 and later codes.
Fv: long-period site coefficient (at 1.0 s-period) The greater of this value or that returned from tables in the referenced code will be used. Note that some cases for Site Class E and F do NOT have values in the codes, so it is critical a value is input in these cases. This value is not used for ASCE 7-22 and later codes.
SMS: the maximum short-period spectral response factor. This value is calculated for codes earlier than ASCE 7-22 and will not appear as an input. For ASCE 7-22 and later, this value is input by the designer.
SM1: the maximum 1 second spectral response factor. This value is calculated for codes earlier than ASCE 7-22 and will not appear as an input. For ASCE 7-22 and later, this value is input by the designer.
Skirt is sensitive to buckling: This checkbox only applies to Skirt supports. And if checked it will adjust the CR-I value to a greater value in some cases resulting in a higher load value.
ap: the amplification factor related to the response of a system or component as affected by the type of seismic attachment; this is only used for vessels designs as supported by another structure. This value is not used for ASCE 7-22 and later codes.
CAR: the component resonance ductility factor; this is only used for vessel designs supported by another structure. This value is used for ASCE 7-22 and later codes.
Rmu: the structural ductility reduction factor; this is only used for vessel designs supported by another structure. This value is used for ASCE 7-22 and later codes.
Use ASCE 15.4.1 Step 2 exception: Checking this box will invoke the exception as described in ASCE and will adjust the Cs calculation and typically results in a lower load value.
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Tv: This is a user input for the ASCE 7-16 and later code yearyears. The default is set to 0.1 to give conservative estimations within the software. The user can input values but only the range from 0 to 2 is usable within the equations. Values outside of this range will be taken equal to the upper or lower bound.
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