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.
Wind Exposure Type: can be A, B, C or D for 1998 (A is not an option for later years).
Importance Factor (I): This is an input by the User. Its range is set to 0.77 to 1.15. If the User inputs a value outside this range it will give a popup message that informs the User they are outside the range. This value is only used in Wind calculations of 2005 and earlier.
Ground Elevation Factor (Ke): This field only affects Wind Codes ASCE 7-16 and newer. It will default and patch from older vessels to 1. Range is 0.8 to 1. Outside this range, have popup warn user of typical range.
Directionality factor (Kd): This is a User input. It will default and patch from older vessels to 1. Range is 0.8 to 1. Outside this range, have popup warn user of typical range.
Force Coefficient (Cf): This is a User input. This will default to 1.2, it will range from 0.5 to 2. Outside this range, have popup warn user of typical range. It is the force coefficient to be used in determination of wind loads for other structures.
Supported by other structure: It is new check box, defaults to false. This has an effect on what Wind calculations are performed.
Horizontal Coefficient (GCr)h: This is a new field. It is a product of external pressure coefficient and gust-factor to be used in determination of wind loads for rooftop structures.
Roof Height of Supporting Structure (h): It is the mean roof height of a building or height of other structure. It is a new field and will default to 0.
Topographic Factor (Kzt): The wind speed-up over hills, ridges, and escarpments. This ranges from 1 or greater and values entered outside this range will cause a pop up message about being outside the range.
Building Damping Coefficient: This is a field for skirt supports only.
0.2 S Spectral Response Acceleration (Ss): mapped MCER , 5 percent damped, spectral response acceleration parameter at short periods.
1 s Spectral Response Acceleration (S1): mapped MCER , 5 percent damped, spectral response acceleration parameter at a period of 1 s.
Occupancy and Risk Category: The Use or Occupancy of Buildings and Structures designated by the specific Seismic Code.
Site Class: Based on the site soil properties. Where soil properties are not known in sufficient detail to determine the site class, Site Class D shall be used unless the authority having jurisdiction or geotechnical data determines Site Class E or F soils are present at the site.
Response Modification Factor (R): response modification coefficient as given by the specific Seismic Code.
TL: long-period transition period as defined by the Seismic Code
Fa: short-period site coefficient (at 0.2 s-period)
Fv: long-period site coefficient (at 1.0 s-period)
Skirt is sensitive to buckling: This checkbox only applies to Skirt supports. And if checked it will adjust the CR-I value
ap: the amplification factor related to the response of a system or component as affected by the type of seismic attachment
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
z: height in structure of point of attachment of component with respect to the base
Supported by another structure: This has an effect on what Seismic calculations are performed.
h: average roof height of structure with respect to the base
Force Ip to 1.5: Checking this box will force set the component importance factor to 1.5
Consider Vertical Seismic Effect: This drop-down will affect the Cev values used in the Seismic calculations