Analysis of Buckled and Pre-bent Columns Used as Vibration Isolators

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dc.contributor.authorSidbury, Jenny Elizabethen
dc.contributor.committeechairPlaut, Raymond H.en
dc.contributor.committeememberEasterling, William Samuelen
dc.contributor.committeememberMurray, Thomas M.en
dc.contributor.departmentCivil Engineeringen
dc.date.accessioned2011-08-06T14:43:09Zen
dc.date.adate2003-12-17en
dc.date.available2011-08-06T14:43:09Zen
dc.date.issued2003-12-04en
dc.date.rdate2003-12-17en
dc.date.sdate2003-12-12en
dc.description.abstractVibrations resulting from earthquakes, machinery, or unanticipated shocks may be very damaging and costly to structures. To avoid such damage, designers need a structural system that can dissipate the energy caused by these vibrations. Using elastically buckled struts may be a viable means to reduce the harmful effects of unexpected vibrations. Post-buckled struts can support high axial loads and also act as springs in a passive vibration isolation system by absorbing or dissipating the energy caused by external excitation. When a base excitation is applied, the buckled strut may act to reduce the dynamic force transmitted to the system, thus reducing the structural damage to the system. Several models of buckled and pre-bent struts are examined with different combinations of parameters and end conditions. The models include pinned or fixed columns supporting loads above their buckling load, and columns with an initial curvature supporting various loads. The varying parameters include external damping, internal damping, and stiffness. The columns will be subjected to simple harmonic motion applied at the base or to a multi-frequency base excitation. The response of each model is measured by the deflection transmissibility of the supported load over a large range of frequencies. Effective models reduce the motion of the supported load over a large range of frequencies.en
dc.description.degreeMaster of Scienceen
dc.format.mediumETDen
dc.identifier.otheretd-12122003-123751en
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-12122003-123751en
dc.identifier.urihttp://hdl.handle.net/10919/9641en
dc.publisherVirginia Techen
dc.relation.haspartETD_1.pdfen
dc.rightsIn Copyrighten
dc.rights.urihttp://rightsstatements.org/vocab/InC/1.0/en
dc.subjectvibrationsen
dc.subjectVibration isolatoren
dc.subjectdynamic responseen
dc.subjectbuckled structuresen
dc.subjectpassive vibration isolationen
dc.titleAnalysis of Buckled and Pre-bent Columns Used as Vibration Isolatorsen
dc.typeThesisen
thesis.degree.disciplineCivil Engineeringen
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen
thesis.degree.levelmastersen
thesis.degree.nameMaster of Scienceen

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