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Syntax
SPECTRUM arg1 arg2
Description
Definition of the spectrum. Important internal variables in the user-defined table are:
Value |
Usage |
Meaning |
_x_ |
$_x_ |
Current abscissa value (exclusive use in the expression of the ordinate of a table). |
_o_ |
$_o_ |
Current circular frequency [rad/s] |
_T_ |
$_T_ |
Current period [s] |
_f_ |
$_f_ |
Current frequency [1/s] = [Hz] |
_xi_ |
$_xi_ |
Current damping in [%] |
Arguments
Minimum quantity: 2
arg1
Value |
Dimension |
Meaning |
TABLE |
KEYWORD |
The spectrum is given as a table. The table can be user-defined (event type GENERAL) or it is determined by the program from the given parameters. |
EXPR |
KEYWORD |
Instead of the user-defined table, any mathematical expression that will be evaluated during the analysis is entered. |
ABSCISSA |
KEYWORD |
The abscissa of the spectrum is determined by the following argument. |
ORDINATE |
KEYWORD |
The ordinate of the spectrum is determined by the following argument. |
arg2 (arg1 = TABLE)
Value |
Dimension |
Meaning |
tname |
TEXT |
Name of the user-defined table or name of the table to be determined automatically. |
arg2 (arg1 = EXPR)
Value |
Dimension |
Meaning |
expr |
TEXT |
Mathematical expression, depending on internal variables (see above); the spectrum is not given by a table, but by any mathematical expression. |
arg2 (arg1 = ABSCISSA)
Value |
Dimension |
Meaning |
OMEGA |
KEYWORD |
The abscissa of the table is interpreted as angular frequency. |
PERIOD |
KEYWORD |
The abscissa of the table is interpreted as period. |
FREQUENCY |
KEYWORD |
The abscissa of the table is interpreted as frequency. |
arg2 (arg1 = ORDINATE)
Value |
Dimension |
Meaning |
DIS |
KEYWORD |
The ordinate of the table is interpreted as displacement. |
VEL |
KEYWORD |
The ordinate of the table is interpreted as velocity. |
ACC |
KEYWORD |
The ordinate of the table is interpreted as acceleration. |
Scopes
EARTHQUAKE
Examples
SPECTRUM TABLE "Spectrum_1"
The table "Spectrum_1” is created and its content is updated during the calculation by the given parameters.
SPECTRUM TABLE "spectrum"
SPECTRUM ABSCISSA OMEGA
SPECTRUM ORDINATE DIS
The spectrum "spectrum” is user defined in the form of a displacement-omega table.
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