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STAAD Commands and Input Instructions
Section 5
5-304
5.32.10.1.2 Response Spectrum Specification per
Eurocode 8
Purpose
This command may be used to specify and apply the RESPONSE
SPECTRUM loading as per Eurocode 8 for dynamic analysis.
General Format:
⎧SRSS ⎫ * ⎧ELASTIC⎫ ⎧X f1⎫
SPE
CTRUM ⎨ABS ⎬ EURO ⎨ ⎬ ⎨Y f2⎬ ACC
⎪CQC ⎪ ⎩ DESIGN ⎭ ⎩Z f3⎭
⎪ASCE ⎪
⎩TEN ⎭
⎧ DAMP f4 ⎫ ⎧LIN ⎫
⎨ CDAMP ⎬ ( ⎨ ⎬ ) (MIS f5) (ZPA f6) (SAVE)
⎩ MDAMP ⎭ ⎩LOG⎭
The data in the first line above must be on the first line of the
command, the remaining data can be on the first or subsequent
lines with all but last ending with a hyphen (limit of 3 lines ).
Starting on the next line, the response spectra is input using
following standard input parameters:
SOIL TYPE ⎧A⎫ ALPHA f7 Q f8
⎨B⎬
⎩C⎭
That is, unlike the custom defined response spectra the EC 8
response spectra is not input using frequency-acceleration
pairs. Based on the type of Response Spectra(Elastic/Design),
Soil Type, Alpha and Q the software generates the applicable
response spectra curve using the guidelines of section 4.2.2 or
4.2.4 of Eurocode 8 as applicable.
SRSS , ABS , CQC, ASCE4-98 & TEN Percent are methods of
combining the responses from each mode into a total response.
CQC, ASCE and TEN include the effect of response magnification
due to closely spaced modal frequencies. ASCE includes more