Improved Modeling of Structural Joint Damping
AIR FORCE INST OF TECH WRIGHT-PATTERSON AFB OH SCHOOL OF ENGINEERING
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The purpose of this thesis is to develop a better model of damping that occurs in structural joints due to coulomb friction when rotational slip occurs in the joints. A one-dimensional, indirect formulation, of the Boundary Element MethodBEM is developed to calculate the displacement, rotation, moment and shear in beams which obey the assumptions of simple beam theory. This BEM code is then modified to account for friction damping at the joint of two beams due to a relative rotation between them. A gross slip model of the friction in the joint is used to establish basic behavior of the beam joint with friction damping. Next, a micro-slip model of friction is developed. The micro-slip model, depending on the applied moment, allows for the elastic rotation of the joint up to some threshold moment where partial slip begins. As the applied moment increases the region of partial slip expands until the entire joint is slipping and the gross slip condition exists. Keywords Coulomb damping theses.
- Structural Engineering and Building Technology