All nonlinear boundary conditions will be made linear for dynamic analysis. The dynamic input will request a (previously analyzed static)load case (e.g. operating) to set the restraint status for the dynamic analysis. For example, if a +Y support lifts off in the seelcted load case, that Y restraint will not appear in the dynamic analysis; if it's resting, a full Y restraint will be used.
Hanger stiffness is included in dynamic analysis.
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Dave Diehl