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General Description
Section 1
1-54
1.12 Member Offsets
Some members of a structure may not be concurrent with the
incident joints thereby creating offsets. This offset distance is
specified in terms of global or local coordinate system (i.e. X, Y
and Z distances from the incident joint). Secondary forces induced,
due to this offset connection, are taken into account in analyzing
the structure and also to calculate the individual member forces.
The new offset centroid of the member can be at the start or end
incidences and the new working point will also be the new start or
end of the member. Therefore, any reference from the start or end
of that member will always be from the new offset points.
See section
5.25
7" 6"
9"
WP
WP
WP
1
2
X
WP refers to the location of the
centroid of the starting or ending
point of the member
Y
n1 n2
MEMBER OFFSET
1 START 7
1 END -6
2 END -6 -9
Figure 1.35