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http://dx.doi.org/10.12652/Ksce.2010.30.3A.241

Development of Slender Aerodynamic Girder for Suspension Bridges  

Kwon, Soon-Duck (전북대학교 토목공학과)
Lee, Myeong-Jae ((주)유신)
Cho, Eukyung (현대건설(주))
Lee, Seung-Ho (전북대학교 대학원 토목공학과)
Publication Information
KSCE Journal of Civil and Environmental Engineering Research / v.30, no.3A, 2010 , pp. 241-256 More about this Journal
Abstract
This study intends to develop an aerodynamic girder for suspension bridge with width corresponding to 1/70 of the main span length. In the first step of present study, parametric study for the effects of major structural properties on aerodynamic stability of bridges was performed. The span length and natural frequency of bridges were found to be free from girder width, girder height, and aspect ratio of width to height. The empirical equation according to confidence interval was proposed to estimate the natural frequencies of bridges from span length. From the sensitivity analysis, it was revealed that the torsional frequency was dominant parameter among various structural properties that affected flutter velocity mostly. The final aerodynamic bridge section which satisfied the flutter criteria was found from section wind tunnel tests for 30 cross sectional models. The aerodynamic stability of the developed cross section was verified by multimode flutter analysis. The present economical cross section can be used for long span suspension bridge.
Keywords
suspension bridge; aerodynamic stability; flutter; aspect ratio;
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Times Cited By KSCI : 1  (Citation Analysis)
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