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Section 5
5-295
ZPA f7 = For use with MIS option only. Defaults to 33 Hz if not
entered. Value is printed but not used if MIS f6 is entered.
FF1 f8 = The f1 parameter defined in the ASCE 4-98 standard in
Hz units. For ASCE option only. Defaults to 2 Hz if not
entered.
FF2 f9 = The f2 parameter defined in the ASCE 4-98 standard in
Hz units. For ASCE option only. Defaults to 33 Hz if not
entered.
Save = The save option results in the creation of a file (file
name with "Acc" extension) containing the joint accelerations
in g’s and radians/sec
2
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SPECTRA data. Choose one of these two input forms.
1. P1, V1; P2, V2; …. ; Pn, Vn. Data is part of input,
immediately following SPECTRUM command. Period – Value
pairs (separated by semi colons) are entered to describe the
Spectrum curve. Period is in seconds and the corresponding
Value is either acceleration (current length unit/sec
2
) or
displacement (current length unit) depending on the ACC or
DIS chosen. Continue the curve data onto as many lines as
needed (up to 500 spectrum pairs). Spectrum pairs must be in
ascending (or descending) order of period. Note, if data is in
g acceleration units, then set SCALE to a conversion factor to
the current length unit (9.807, 386.1, etc.). Also note, do not
end these lines with a hyphen (-). Each SPECTRUM command
must be followed by Spectra data if this input form is used.
2. FILE fn data is in a separate file.
Spectra Curves on FILE fn: When the File fn command has been
provided, then you must have the spectra curve data on a file
named “fn” prior to starting the analysis. The format of the
FILE spectra data allows spectra as a function of damping as
well as period. If the FILE fn command is entered, it must be
with the first spectrum case and will be used for all spectrum
cases. No FILE fn command needs to be entered with the