Page Comparison

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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.

S_MS: 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.

S_M1: 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 C_R-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.

C_AR: 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.

R_mu: 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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