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STAAD Commands and Input Instructions
Section 5
5-108
For members 1, 10, 11 and 13 to 18, the moment about the local Z
axis is released at their end joint. Also, the members are attached
to their END joint about their local x axis through a moment-
spring whose stiffness is 200.0 units of force-length/Degree.
Members 1 and 11 are released at both start and end joints, though
not necessarily in the same degrees of freedom.
Partial Moment Release
Moments at the end of a member may be released partially. This
facility may be used to model partial fixity of connections. The
following format may be used to provide a partial moment release.
This facility is provided under the MEMBER RELEASE option
and is in addition to the existing RELEASE capabilities
.
General Format:
MEMBER RELEASE
* ⎧MP f1 ⎫
⎧START ⎫ ⎪ ⎪
member-list
⎨END ⎬ ⎨ ⎬
⎩BOTH ⎭ ⎪MPX f4 ⎪
⎪MPY f5 ⎪
⎩MPZ f6 ⎭
where f
1
= release factor for all 3 moments; or enter f
4
, f
5
,
and/or f
6
as release factors for each moment separately. The
moment related stiffness co-efficient will be multiplied by a factor
of (1-f
1
) at the specified end. Release factors must be in the range
of 0.001 through 0.999.
See Section
1.8
Example
MEMBER RELEASE
15 TO 25 START MP 0.25