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STAAD Commands and Input Instructions
Section 5
5-260
Notes:
If a pressure or volumetric load is acting on a region or surface,
and the entity which makes up the surface, like a slab, is not part
of the structural model, one can apply the pressure load using this
facility. The load is defined in terms of the pressure intensity at
the 3 or 4 nodes which can be treated as the corners of
the triangular or quadrilateral plane area which makes up the
region. This command may be used as an alternative or supplement
for the Area Load, Floor Load, Wind Load, and other pressure load
situations.
In other words, the element pressure load can be applied along a
global direction on any surface, without actually having elements
to model that surface. Thus, for a sloping face of a building, if one
wants to apply a wind pressure on the sloping face, one can do so
by specifying the joints which make up the boundary of that face.
Three or four joints are specified that form a plane area; pressure
is specified for that area; then STAAD computes the equivalent
joint loads.