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Three-dimensional nonlinear flutter analysis of long-span suspension bridges during erection
Xin-jun Zhang1, Bing-nan Sun, Hai-fan Xiang
1Department of Civil Engineering, Zhejiang University, Hangzhou 310027, China. xinjunzh@163.com
Journal of Zhejiang University. Science
|March 27, 2003
Summary
The Yichang Suspension Bridge showed better aerodynamic stability during erection with non-symmetrical girder placement. Nonlinear effects significantly impact stability, necessitating their accurate consideration in long-span bridge analysis.
Area of Science:
- Structural Engineering
- Aerodynamics
- Civil Engineering
Background:
- Long-span suspension bridges require rigorous aerodynamic stability analysis during erection.
- Traditional analysis often simplifies nonlinearities, potentially misrepresenting actual behavior.
Purpose of the Study:
- To investigate the aerodynamic stability of the Yichang Suspension Bridge during its erection phase.
- To evaluate the impact of nonlinearities in structural dynamics and aeroelastic forces on bridge stability.
Main Methods:
- Utilized three-dimensional nonlinear flutter analysis.
- Fully considered nonlinearities arising from large deformations in structural dynamic characteristics.
- Accounted for nonlinearities in aeroelastic forces.
Main Results:
- The bridge exhibited enhanced aerodynamic stability with non-symmetrical erection of stiffening girders compared to symmetrical methods.
- Nonlinear effects were identified as a primary cause for a significant decrease in aerodynamic stability.
- The study confirmed the critical role of nonlinear factors in the erection phase.
Conclusions:
- Non-symmetrical erection schedules may offer improved aerodynamic stability for suspension bridges.
- Accurate consideration of nonlinear factors is crucial for reliable aerodynamic stability assessments of long-span suspension bridges during erection.
- Findings highlight the need to refine erection strategies based on nonlinear dynamic analysis.