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STAAD Commands and Input Instructions
Section 5
5-262
x1, y1 = Local X and Y coordinates of the corner nearest to the
surface origin of the loaded region. Measured from the origin of
the surface, in the local coordinate system of the surface.
x2, y2 = Local X and Y coordinates of the corner farthest from the
surface origin of the loaded region. Measured from the origin of
the surface, in the local coordinate system of the surface.
Concentrated force on Surface
General Format
LOA
D n
SUR
FACE LOAD
⎧ GX
⎫
surface-list PRE
SSURE ⎨ GY ⎬ p x y
⎩
GZ
⎭
GX, GY and GZ : Global X, Y and Z directions. If the direction is
omitted, the load will act along the local Z axis of the surface
p = Value of the concentrated force. Negative sign indicates load
acts opposite to the direction of the axis specified.
x, y = Local X and Y coordinates of the point of action of the
force. Measured from the origin of the surface, in the local
coordinate system of the surface.
Examples
LOAD 1 uniform pressure on full surface
SURFACE LOAD
1 2 PRESS GX 0.002
3 GX -0.0025
LOAD 2 concentrated force
SURFACE LOAD
10 12 PRE GZ 400 3.5 4.5