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D_Trein_Cristiano_Augusto.pdfDissertation_全文24.12 MBAdobe PDF見る/開く
ykogk03141.pdfAbstract_要旨200.23 kBAdobe PDF見る/開く
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dc.contributor.advisor白土, 博通ja
dc.contributor.advisor杉浦, 邦征ja
dc.contributor.advisor河井, 宏允ja
dc.contributor.authorCristiano Augusto Treinja
dc.contributor.transcriptionクリスティアノ アウグスト トレインja
dc.date.accessioned2009-10-26T02:11:10Z-
dc.date.available2009-10-26T02:11:10Z-
dc.date.created2009ja
dc.date.issued2009-09-24ja
dc.identifier.urihttp://hdl.handle.net/2433/85380-
dc.description.abstractWith the increase of the spans in the last decades, new concepts of projects and perceptions about bridges around the world have imposed the need of the development of new design techniques. Aerodynamic instabilities, which were not being of concern not long time ago, started to demand special care during all phases of the projects. Among them, coupledflutter instability has gained remarkable importance, due to its catastrophic consequences and impacts on the safety of the structure. Concerning coupled-flutter, aerodynamic derivatives have been regarded as fundamental components for the assessment of the stability of long-span bridges, resulting in that the focus during the proposition of the bridge deck geometry has been put essentially on the control of those empirical indices. The relationships between bridge deck geometric characteristics and the values assumed by those indices are recognized to be non-linear and straightforward approaches for their prompt evaluation are still not available. Because of that, trial and error experimental techniques based on wind tunnel tests have been regarded as main tools in the search of geometric configurations of bridge decks that satisfy the flutter stability requirements from the aerodynamic derivatives point of view. Since aerodynamic derivatives are resultant from the unsteady pressure characteristics developed along the bridge deck, it must be more rational to search for relationships between deck geometry and flutter stabilization from the unsteady pressure characteristics point of view. However, the complex geometric characteristics associated to modern longspan bridges may impose difficulties on the pressure measurements in wind tunnel tests, becoming counter-productive. So, the direct evaluation of the aerodynamic derivatives through alternative methods has been preferred in wind tunnel tests. In this research, the impacts of the deck geometric characteristics on the aerodynamic derivatives and, consequently, on flutter stabilization are assessed from the unsteady pressure characteristics point of view. Rectangular cross-sections arranged in single box and twobox configurations are used as base geometries and the influences of different geometric singularities (geometric modifications as leading edges, vertical plates and slots) on the unsteady pressure characteristics of those cylinders are systematized through the proposition of semi-empirical formulations. The knowledge generated herein may serve as a base for the development of a design framework based on the direct manipulation of the unsteady pressure characteristics of the deck through the use of geometric singularities, aiming the flutter stabilization by controlling indirectly the aerodynamic derivatives. Such a framework is to be used in substitution of some stages of wind tunnel test campaigns, and its feasibility is evaluated along the study. It was concluded that the relationships of geometric singularities with the unsteady pressure characteristics are much more linear and predictable than their relationships with the aerodynamic derivatives, opening a new methodology for the proposition of geometric improvements. Data regarding the geometries studied herein are also provided along the study, as reference for future development.ja
dc.format.mimetypeapplication/pdfja
dc.language.isoengja
dc.publisher京都大学 (Kyoto University)ja
dc.publisher.alternative京都大学ja
dc.rights許諾条件により本文は2010-03-01に公開ja
dc.subject長大橋ja
dc.subjectフラッターja
dc.subject非定常圧力ja
dc.subject非定常空気力ja
dc.subject耐風安定性ja
dc.subject.ndc500ja
dc.titleStudy on the Unsteady Pressure Characteristics of Bluff Bodies focusing on Flutter Stabilization of Long-Span Bridgesja
dc.title.alternative長大橋のフラッター安定化に着目した非流線型物体の非定常圧力特性に関する研究ja
dc.title.transcriptionチョウダイキョウ ノ フラッター アンテイカ ニ チャクモクシタ ヒリュウセンケイ ブッタイ ノ ヒテイジョウ アツリョク トクセイ ニ カンスル ケンキュウja
dc.typeDFAMja
dc.type.niitypeThesis or Dissertationja
dc.textversionauthorja
dc.address工学研究科社会基盤工学専攻ja
dc.startdate.bitstreamsavailable2010-03-01ja
dc.identifier.ndlid000010631826ja
dc.description.degreegrantorKyoto University (京都大学)ja
dc.description.degreeuniversitycode0048ja
dc.description.degreelevel新制・課程博士ja
dc.description.degreediscipline博士(工学)ja
dc.description.degreereportnumber甲第14914号ja
dc.description.degreenumber工博第3141号ja
dc.description.degreekucallnumber新制||工||1471(附属図書館)ja
dc.description.degreeserialnumber27352ja
dc.description.degreendlcallnumberUT51-2009-M828ja
dc.date.granted2009-09-24ja
dc.description.degreeaffiliation京都大学大学院工学研究科社会基盤工学専攻ja
dc.description.degreeexamcommittee(主査)教授 白土 博通, 教授 杉浦 邦征, 教授 河井 宏允ja
dc.description.degreeprovision学位規則第4条第1項該当ja
dc.identifier.selfDOI10.14989/doctor.k14914ja
出現コレクション:博士(工学)

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