کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
268907 504451 2007 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Gust buffeting of long span bridges: Double Modal Transformation and effective turbulence
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات مهندسی ژئوتکنیک و زمین شناسی مهندسی
پیش نمایش صفحه اول مقاله
Gust buffeting of long span bridges: Double Modal Transformation and effective turbulence
چکیده انگلیسی

The gust buffeting of long span bridges is analysed by the Double Modal Transformation, a method consisting in the joint transformation into principal coordinates of the structural displacements (modal analysis) and of the loading exciting the bridge (Proper Orthogonal Decomposition, POD). Even if an accurate representation of the turbulent field producing the loading requires a high number of modes, thanks to the orthogonality of structural and turbulence modes, a satisfactory estimate of the structural response can be achieved representing the turbulence field through only a few modes. Based on this observation, an effective turbulence field is defined as that part of the actual turbulence which really influences the structural response, i.e. the turbulence reconstructed using only the necessary POD modes. The analysis of the spectral properties of the effective turbulence field shows that its harmonic content is strongly reduced and concentrated in a restricted frequency band with respect to the actual turbulence; moreover, it is highly correlated also for large distances. These observations allow a critical selection of the time and space discretizations to adopt for numerical analyses, strongly reducing their computational burden.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Engineering Structures - Volume 29, Issue 8, August 2007, Pages 1698–1707
نویسندگان
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