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STAAD Commands and Input Instructions
Section 5
5-86
5.20.8 Curved Member Specification
Purpose
The following commands are used to specify that a member is
curved. The curve must be a segment of a circle and the internal
angle subtended by the arc must be less than 180 degrees. Any
non-tapered cross-section is permitted.
General Format:
MEMBER CURVED
member-list
RADIUS r GAMMA g PRESS p
where
r = radius in length units
g = The angle in degrees used to define the plane of the circle. The
angle is defined using the same set of rules used to define the
orientation (beta angle) of a straight member connected
between the 2 nodes.
p = Pressure/Flexibility parameter for pipe bends. See notes.
The plane of the circle defines the plane formed by the straight
line joining the 2 ends of the arc, and the local Y axis of an
imaginary straight member between those 2 points. The positive
value of the GAMMA angle is obtained using the same sense as
the positive value of the beta angle of that imaginary straight line
member whose local Y axis points towards the vertex of the arc.
Several diagrams intended to show the GAMMA angle for various
segments lying in the 3 global planes are shown.
Pressure/Flexibility Parameter. This applies only to pipe bend
(elbow) members (OD and ID entered). These members will flex
more due to ovalization depending on internal pressure. The