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Wind and Structures Volume 10, Number 5, September 2007 , pages 421-435 DOI: https://doi.org/10.12989/was.2007.10.5.421 |
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Investigation on flutter mechanism of long-span bridges with 2d-3DOF method |
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Yongxin Yang, Yaojun Ge and Haifan Xiang
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| Abstract | ||
| A two-dimensional flutter analysis method (2d-3DOF method) was developed to simultaneously investigate the relationship between oscillation parameters and aerodynamic derivatives of three degrees of freedom, and to clarify the coupling effects of different degrees of freedom in flutter instability. With this method, the flutter mechanism of two typical bridge deck sections, box girder section and two-isolated-girder section, were numerically investigated, and both differences and common ground in these two typical flutter phenomena are summarized. Then the flutter stabilization effect and its mechanism for long-span bridges with box girders by using central-slotting were studied by experimental investigation of aerodynamic stability and theoretical analysis of stabilizing mechanism. Possible explanation of new findings in the evaluation trend of critical wind speed through central vent width is finally presented. | ||
| Key Words | ||
| aerodynamic instability; flutter analysis; long span bridge; coupling effect; flutter mechanism; central slotting; vent width | ||
| Address | ||
| State Key Lab for Disaster Reduction in Civil Engineering, Tongji University, Shanghai, China | ||