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STAAD Commands and Input Instructions
Section 5
5-308
Description
See Sections
1.18.3, 5.30,
and 5.34 of
STAAD
Technical
R
eference
M
anual
This command should appear as part of a loading specification. If
it is the first occurrence, it should be accompanied by the load data
to be used for frequency and mode shape calculations. Additional
occurrences need no additional information. Maximum response
spectrum load cases allowed in one run is 4.
Results of frequency and mode shape calculations may vary
significantly depending upon the mass modeling. All masses that
are capable of moving should be modeled as loads, applied in all
possible directions of movement. For dynamic mass modeling, see
sections 5.32 and 1.18.3 of STAAD Technical Reference Manual.
An illustration of mass modeling is available, with explanatory
comments, in Example Problem No.11_EC8.
Example
LOAD 2 SPECTRUM IN X-DIRECTION
SELFWEIGHT X 1.0
SELFWEIGHT Y 1.0
SELFWEIGHT Z 1.0
JOINT LOAD
10 FX 17.5
10 FY 17.5
10 FZ 17.5
MEMBER LOADS
5 CON GX 5.0 6.0
5 CON GY 5.0 6.0
5 CON GX 7.5 10.0
5 CON GY 7.5 10.0
5 CON GX 5.0 14.0
5 CON GY 5.0 14.0
SPECTRUM SRSS EURO ELASTIC X 1 ACC DAMP
0.05 –
LIN MIS 0 ZPA 40
SOIL TYPE A ALPHA 2 Q 1.5