| Mechanics & Civil Engineering |
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| Three-dimensional nonlinear flutter analysis of long-span suspension bridges during erection |
| ZHANG Xin-jun, SUN Bing-nan, XIANG Hai-fan |
| Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China; Department of Bridge Engineering, Tongji University, Shanghai 200092, China |
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Abstract In this work, the aerodynamic stability of the Yichang Suspension Bridge over Yangtze River during erection was determined by three-dimensional nonlinear flutter analysis, in which the nonlinearities of structural dynamic characteristics and aeroelastic forces caused by large deformation are fully considered. An interesting result obtained was that the bridge was more stable when the stiffening girders were erected in a non-symmetrical manner as opposed to the traditional symmetrical erection schedule. It was also found that the severe decrease in the aerodynamic stability was due to the nonlinear effects. Therefore, the nonlinear factors should be considered accurately in aerodynamic stability analysis of long-span suspension bridges during erection.
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Received: 05 December 2001
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