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Section 5
5-125
5.25 Member Offset Specification
Purpose
This command may be used to rigidly offset a frame member end
from a joint to model the offset conditions existing at the ends of
frame members.
General format:
MEMBER OFFSETS
⎧START ⎫
member-list
⎨ ⎬ ( LOCAL ) f
1
, f
2
, f
3
⎩END ⎭
Description
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
Figure 5.16
f
1
, f
2
, and f
3
correspond to
the distance, measured in
LOCALized or Global
coordinate system, from
the joint (START or END
as specified) to the
centroid of the starting or
ending point of the
members listed. MEMBER
OFFSET command can be
used for any member whose starting or ending point is not
concurrent with the given incident joint. This command enables the
user to account for the secondary forces, which are induced due to
the eccentricity of the member. Member offsets can be specified in
any direction, including the direction that may coincide with the
member x-axis.
See Section
1.11