3D Connexion Version 6.6

*RESPONSE SPECTRUM

17.14 *RESPONSE SPECTRUM: Calculate the response based on user-supplied response

spectra.

This optionis used to calculate estimates of peak values of displacements and stresses based on user-supplied

response spectra (deﬁned using the*S PECTRUM option) and on the natural modes of the system.

Product: ABAQUS/Standard

Type: History data

Level: Step

References:

•“Response spectrum analysis,” Section 6.3.10of the ABAQUS Analysis User ’sManual

•*SPECTRUM

Optional parameters:

COMP

Set COMP=ALGEBRAIC to sum the directional excitation com ponents algebraically. If this

parameter is used, the directional excitation components aresum med ﬁrst, followed by the modal

summation.

Set COMP=SRSS (default) to use the square root of the sum of the squares. Ifthis para meter

is used, the modal summation is perform ed ﬁrst, followed by the summation of the directional

excitation components.

SUM

Set SUM=ABS (default) to sum the absolute values of theresponses 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 rootof the sum of squares summation.

Set SUM=TENP to use the TenPercent Method.

Data lines for a response spectrum analysis:

First line:

1. Name ofthe 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: ID:

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