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Section 5
5-109
The above RELEASE command will apply a factor of 0.75 on
the moment related stiffness coefficients at START of members 15
to 25.
Notes
Member releases are a means for describing a type of end
condition for members when the default condition, namely, fully
moment and force resistant, is not applicable. Examples are bolted
or riveted connections. Partial moment releases are a way of
specifying bending and torsional moment capacity of connections
as being a fraction of the full bending and torsional strength.
It is important to note that the factor f
1
indicates a reduction in the
stiffness corresponding to the rotational degrees of freedom MX,
MY and MZ. In other words, the user should not expect the
moment on the member to reduce by a factor of f
1
. It may be
necessary for the user to perform a few trials in order to arrive at
the right value of f
1
, which results in the desired reduction in
moment.
Also, START and END are based on the MEMBER INCIDENCE
specification. The BOTH specification will apply the releases at
both ends.
At any end of the member, for any particular DOF, full, partial and
spring release cannot be applied simultaneously. Only one out of
the three is permitted.
If MY (or MZ) is fully released at both ends, then VZ (or VY)
cannot be transmitted through the member. The final shears in the
member will be entirely due to loads applied directly to the
member.