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STAAD Commands and Input Instructions
Section 5
5-238
5.31.4 Definition of Time History Load
Purpose
This set of commands may be used to define parameters for Time
History loading on the structure.
General format:
DEFINE TIME HISTORY (DT x)
⎧ACCELERATION ⎫
TYPE i ⎨ ⎬ (SCALE f
7
) (SAVE)
⎩
FORCE or MOMENT
⎭
⎧
READ f ( f ) ⎫
n 8
⎨ - OR - ⎬
⎪
t
1
p
1
t
2
p
2
.... t
n
p
n
⎪
⎪ - OR -
⎪
⎩function-spec ⎭
where function-spec =
⎧SINE ⎫
FUNCTION ⎨ ⎬
⎩
COSINE ⎭
⎧FREQUENCY ⎫ ⎧SUBDIV f
6
⎫
AMPLITUDE f
0
⎨ ⎬ f
2
(PHASE f
3
) CYCLES f
4
⎨STEP f
5
⎬
⎩RPM ⎭ ⎩ ⎭
Repeat TYPE and Amplitude vs Time sets until all are entered, then:
ARRIVAL TIME
See Sections
1.18.3 and
5.32.10.2
a
1
a
2
a
3
....... a
n
⎧
DAMPING d ⎫
⎨
CDAMP ⎬
⎩MDAMP ⎭