Dynamic response of multi-degree of freedom structure with sliding isolation system and uplift

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dc.contributor.advisorNagarajaiah, Satishen_US
dc.creatorVemuru, Venkata Srivishnu Mohanen_US
dc.date.accessioned2011-07-25T02:07:06Zen_US
dc.date.available2011-07-25T02:07:06Zen_US
dc.date.issued2010en_US
dc.description.abstractIn this study the two dimensional dynamic response of a Multi Degree of Freedom (MDOF) sliding isolated structure permitted to uplift is studied. The MDOF superstructure is supported by two sets of sliding bearings situated at both the ends of the base mat. The foundation supporting the sliding bearings is assumed to be flexible and modeled using two sets of viscoelastic spring-dashpot systems attached below the sliding isolation bearings. The nonlinear stick-slip behavior of the friction based sliding isolation system is modeled using a hysteretic Bouc-Wen model. A nonlinear analytical model is formulated which takes into account the linear equations of motion of the superstructure and the base mat with stick-slip behavior of sliding isolators and in addition the following effects: uplift and loss of contact at the sliding bearings, and variation of coefficient of friction with velocity and bearing pressure. For comparison purposes fixed base structure with uplift is also modeled. The analytical model is solved using a two-step solution methodology and Pseudo-force method is employed for calculating the nonlinear forces acting on the structure at the interface of sliding isolation system in both the horizontal (stick-slip) direction as well as the vertical (uplift-contact direction). The analytical model developed is validated using experimental results of a 1:4 scaled model. Parametric study is performed with the analytical model (at full scale) by varying the periods of the superstructure, time period of the sliding isolation system, slenderness ratio of superstructure, vertical stiffness of foundation and pulse excitation parameters. The dynamical response of the MDOF structure with sliding isolation and uplift permitted is compared with sliding isolation with uplift prevented and fixed base structure with uplift respectively. The behavior of the MDOF system is studied for both near-source earthquake ground motion and their corresponding cycloidal approximations. The results of the study highlight the advantages of the combined mechanism of sliding isolation and vertical uplift for reduction of structural response of a MDOF system, as compared to the case without uplift and the case without sliding.en_US
dc.format.mimetypeapplication/pdfen_US
dc.identifier.callnoTHESIS C.E. 2010 VEMURUen_US
dc.identifier.citationVemuru, Venkata Srivishnu Mohan. "Dynamic response of multi-degree of freedom structure with sliding isolation system and uplift." (2010) Master’s Thesis, Rice University. <a href="https://hdl.handle.net/1911/62170">https://hdl.handle.net/1911/62170</a>.en_US
dc.identifier.urihttps://hdl.handle.net/1911/62170en_US
dc.language.isoengen_US
dc.rightsCopyright is held by the author, unless otherwise indicated. Permission to reuse, publish, or reproduce the work beyond the bounds of fair use or other exemptions to copyright law must be obtained from the copyright holder.en_US
dc.subjectMechanical engineeringen_US
dc.titleDynamic response of multi-degree of freedom structure with sliding isolation system and upliften_US
dc.typeThesisen_US
dc.type.materialTexten_US
thesis.degree.departmentChemical and Biomolecular Engineeringen_US
thesis.degree.disciplineEngineeringen_US
thesis.degree.grantorRice Universityen_US
thesis.degree.levelMastersen_US
thesis.degree.nameMaster of Scienceen_US
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