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STAAD Commands and Input Instructions
Section 5
5-310
5.32.10.2 Application of Time Varying Load for
Response History Analysis
Purpose
This set of commands may be used to model Time History loading on
the structure for Response Time History analysis. Nodal time
histories and ground motion time histories may both be provided
under one load case.
General format:
TIM
E LOAD
⎧FX ⎫
⎪FY ⎪
joint list
⎨FZ ⎬ I
t
I
a
f
1
See Sections
1.18.3, and
5.31.4
⎪MX ⎪
⎪MY ⎪
⎩
MZ
⎭
⎧X ⎫
GRO
UND MOTION ⎨Y ⎬ I
t
I
a
f
1
⎩
Z
⎭
Where I
t
= sequential position in the input data of type number of
time varying load. To refer to first type number entered, use
a 1 here regardless of actual type number entered. Ground
Motion must have an Acceleration Type; Time Load forces
must have a Force type; and Time Load moments must have
a Moment Type (see Section 5.31.4).
I
a
= arrival time number (see Section 5.31.4) (integer). This
is the sequential number of the arrival time in the list
explained in section 5.31.4. Thus the arrival time number of
a
3
is 3 and of a
n
is n.
f
1
= The Force, Moment, or Acceleration Amplitude at this
joint and direction will be multiplied by this factor (default =
1.0). [ For accelerations, if the amplitude-time curve was in
g’s, please use the Scale Factor in the Define Time History