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FME Transactions
2013, vol. 41, br. 4, str. 279-284
jezik rada: engleski
vrsta rada: neklasifikovan

Nestacionarnost očiglednih prirodnih frekvencija mosta tokom prelaska vozila
aROD Innovative Solutions Roughan & ODonovan, Dublin, Ireland
bSchool of Architecture, landscape and civil engineering, University College Dublin, Ireland

e-adresa: canterolauer@gmail.com

Sažetak

U ovom radu se numerički pokazuje kako se menjaju prirodne frekvencije mosta pri prelasku vozila. Modelovana je Ojler-Bernulijeva greda preko koje prelazi vozilo sa jednim stepenom slobode. Korišćenje ovog jednostavnog modela interakcije između vozila i mosta ima opravdanja s obzirom da je cilj istraživanja da se stekne uvid u dinamičko ponašanje pokretnog opterećenja koje je u interakciji sa mostom. Numerički rezultati pokazuju da varijacije kod prirodnih frekvencija u velikoj meri zavise od odnosa frekvencija vozila i konstrukcije i odnosa masa. U nekim uslovima su zapažene značajne varijacije kod modalnih osobina. Pored toga, može se izvršiti analiza reagovanja vozila koje prelazi most. Analiza frekvencije signala po vremenu kod vertikalnog ubrzanja vozila jasno pokazuje kako se frekvencije razvijaju pri prolazu vozila. Karakteristike lokalizacije frekvencija kod Transformacije talasićima (modifikovane funkcije Litlvuda i Paleja) se istražuju kod analize signala i prikazivanja relevantnih rezultata.

Ključne reči

vehicle; bridge; natural frequency; wavelet; dynamic vibration; non-stationary

Reference

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