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STAAD Commands and Input Instructions
Section 5
5-254
X or Y Direction of variation of element pressure.
The TRAP X/Y option indicates that the variation
of the Trapezoid is in the local X or in the local Y
direction. The load acts in the global direction if
selected, otherwise in the local Z axis.
f
1
Pressure intensity at start.
f
2
Pressure intensity at end.
Alternatively the TRAP and JT options may be selected together in
order to specify the actual pressures at the joints.
f
1
f
2
f
3
f
4
Pressure intensities at the joints.
Notes
1. “Start” and “end” defined above are based on positive
directions of the local X or Y axis.
2. While the X or Y indicates the direction of variation of the
trapezoidal load, the load itself acts in the global or local Z
direction as specified.
3. Pressure intensities at the joints allows linear variation of
pressure in both the X and Y local directions simultaneously.
4. The TRAP load with global directions may be used to apply a
volumetric type of pressure. For example, consider a grain
silo with a sloping wall. In the event of modelling it using
non-uniform elements, by which we mean elements whose 3
or 4 nodes are all at different elevations, the grain height at
each node will depend on the elevation of the node. One can
apply the pressure by specifying the intensity at each node of
each element.