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RESPONSE SPECTRUM
17.14
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RESPONSE SPECTRUM: Calculate the response based on user-supplied response
spectra.
This option is used to calculate estimates of peak values of displacements and stresses based on user-supplied
response spectra (defined using the
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SPECTRUM option) and on the natural modes of the system.
Product: ABAQUS/Standard
Type: History data
Level: Step
References:
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“Response spectrum analysis,” Section 6.3.10 of the ABAQUS Analysis User ’s Manual
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SPECTRUM
Optional parameters:
COMP
Set COMP=ALGEBRAIC to sum the directional excitation components algebraica lly. If th is
parameter is used, the d irectional excitation compone nts are summed first, followe d by the modal
summ ation.
Set COMP=SRSS (default) to use the square root of the sum of the squares. If this parameter
is used, the modal summation is performed first, followed by the summation of the directional
excitation components.
SUM
Set SUM=ABS (default) to sum the absolute values of the responses in each natural mode.
Set SUM=CQC to use the complete quadratic combination method to sum the responses in
each natural mode.
Set SUM=NRL to use the Naval Research Laboratory method.
Set SUM=SRSS to use the square root of the sum of squares summ ation.
Set SUM=TENP to use the Ten Percent Method.
Data lines for a response spectrum analysis:
First line:
1. Name of the response spectrum to be used.
2. X-direction cosine of this direction.
3. Y-direction cosine of this direction.
17.14–1
ABAQUS Version 6.1 Module:
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