Show simple item record

dc.contributor.authorNaga, Pradeepen_US
dc.date.accessioned2014-03-14T20:43:48Z
dc.date.available2014-03-14T20:43:48Z
dc.date.issued2011-08-05en_US
dc.identifier.otheretd-08192011-140427en_US
dc.identifier.urihttp://hdl.handle.net/10919/34646
dc.description.abstractNonlinear structures, when subjected to multiple ground motion records that are scaled to consistent ground motion intensity show significant variation in their response. This effect of ground motion randomness on the variation of structural response is defined as Record-to-Record (RTR) Variability. Ground motion characteristics that contribute to this variability in response includes the variation of signal composition (frequency content) with time (spectral nonstationarity).The phenomenon of moving resonance which occurs when the frequency content of the ground motion shifts in a similar manner as the natural frequencies of the structural response, is likely a contributor to variability. This brings the need to further understand the sources of variability due to moving resonance. The present study was carried out to develop a method to analyze the time-frequency content of a ground motion to assess the occurrence of moving resonance and to quantify its potential in effecting the structural systems. Bilinear elastic and elastoplastic hysteretic behavior was considered. Detailed analysis is done to quantify the effect of moving resonance on structural systems due to 22 far field ground motion records. The wavelet coefficient plots gave very good detail of the characteristics of the ground motions that were not clear from the acceleration time histories and response spectra plots. Instances of moving resonance were found out to be significant. Amplification due to moving resonance was found to be quite large. One instance studied in detail (accelerogram of Northridge earthquake at Beverly Hills) had peak displacement amplified by 6 times compared to the amount of peak displacement expected if the system did not exhibit moving resonance. Based on the analyses results, the characteristics of the ground motion records that donâ t cause significant moving resonance effect on structural systems were observed. Similarly, the characteristics of the ground motions that do cause moving resonance effect on structural systems were examined.en_US
dc.publisherVirginia Techen_US
dc.relation.haspartNaga_P_T_2011.pdfen_US
dc.rightsI hereby certify that, if appropriate, I have obtained and attached hereto a written permission statement from the owner(s) of each third party copyrighted matter to be included in my thesis, dissertation, or project report, allowing distribution as specified below. I certify that the version I submitted is the same as that approved by my advisory committee. I hereby grant to Virginia Tech or its agents the non-exclusive license to archive and make accessible, under the conditions specified below, my thesis, dissertation, or project report in whole or in part in all forms of media, now or hereafter known. I retain all other ownership rights to the copyright of the thesis, dissertation or project report. I also retain the right to use in future works (such as articles or books) all or part of this thesis, dissertation, or project report.en_US
dc.subjectMoving Resonanceen_US
dc.subjectWavelet Transformsen_US
dc.subjectRecord-to-Record Variabilityen_US
dc.subjectResponse History Analysisen_US
dc.titleAnalyzing the Effect of Moving Resonance on Seismic Response of Structures using Wavelet Transformsen_US
dc.typeThesisen_US
dc.contributor.departmentCivil Engineeringen_US
dc.description.degreeMaster of Scienceen_US
thesis.degree.nameMaster of Scienceen_US
thesis.degree.levelmastersen_US
thesis.degree.grantorVirginia Polytechnic Institute and State Universityen_US
thesis.degree.disciplineCivil Engineeringen_US
dc.contributor.committeechairEatherton, Matthew Royen_US
dc.contributor.committeememberChapman, Martin C.en_US
dc.contributor.committeememberCharney, Finley A.en_US
dc.identifier.sourceurlhttp://scholar.lib.vt.edu/theses/available/etd-08192011-140427/en_US
dc.date.sdate2011-08-19en_US
dc.date.rdate2011-09-02
dc.date.adate2011-09-02en_US


Files in this item

Thumbnail

This item appears in the following Collection(s)

Show simple item record