Improvement effects of bottom lateral bracings on dynamic performance of curved steel twin I-girder bridges under running vehicles

Autor: Takashi Matsumoto, Md. Robiul Awall, Xingwen He, Toshiro Hayashikawa
Rok vydání: 2013
Předmět:
Zdroj: International Journal of Steel Structures. 13:275-290
ISSN: 2093-6311
1598-2351
Popis: The torsional stiffness of curved twin I-girder bridges is very low, which may lead to a vulnerability to eccentric dynamic loads. This study is intended to investigate the improvement effect of bottom lateral bracings on dynamic performance of curved twin I-girder bridges under running vehicles, using a developed numerical approach. In this approach, to conduct the running vehicle-bridge interaction analysis, finite element method is used to create the detailed models of both the curved bridge and the running vehicle. Parametric studies are carried out using these numerical models to investigate the effect of bottom lateral bracings on the dynamic performance of the curved bridge under running vehicles. The numerical results indicate that the proposed bottom lateral bracing systems can increase the torsional stiffness of the bridge, whose increasing rate depends on the type of bracing configuration. The bottom lateral bracings can also distribute dynamic loads smoothly between the two main girders, which leads to a more stable structure.
Databáze: OpenAIRE
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