PENG Wei,YANG Xiongwei.Experimental Study on the Flutter Stability Countermeasures of a Suspension Bridge with a Stiffened Plate‑truss Composite Girder[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):200-207.
PENG Wei,YANG Xiongwei.Experimental Study on the Flutter Stability Countermeasures of a Suspension Bridge with a Stiffened Plate‑truss Composite Girder[J].Journal of Disaster Prevention and Mitigation Engineering,2022,42(01):200-207. DOI: 10.13409/j.cnki.jdpme.202002037.
Experimental Study on the Flutter Stability Countermeasures of a Suspension Bridge with a Stiffened Plate‑truss Composite Girder
In order to study the flutter stability of a suspension bridge with a plate-truss composite stiffened girder, a long-span suspension bridge built in China was taken as the background, and the flutter mitigation effects of upper and lower central stabilizers and horizontal stabilizer were studied, respectively, through the section model wind tunnel test. Then, the effect of the damping ratio on the flutter critical wind speed of the main girder was investigated. Finally, the three-component aerostatic force coefficients of the plate-truss stiffened girder were compared between the original design and the girder with the upper central stabilizer. The results show that the upper central stabilizer can effectively suppress the flutter of the plate-truss stiffened girder, and the growth rate of the critical wind speed varies nonlinearly with the increase of the height of the stabilizer; the lower central stabilizer installed under the bridge deck cannot improve the flutter performance of the main girder, but when it installed at the lower lateral combination of the girder can increase the flutter critical wind speed to some extent. The flutter stability of the main girder is deteriorated by the horizontal stabilizer installed at the upper edge of the deck; the main girder can achieve better flutter performance when the upper and lower central stabilization plates are used together. Damping ratio has an obvious effect on the flutter of the plate-truss stiffened girder with the main feature of torsional vibration, and the installation of upper central stabilizer with the same height as the railings has little effect on the three-component aerostatic force coefficients of the girder at small angles of attack.
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