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| Buffeting induced internal forces of long span suspension bridges |
| Received:January 05, 2009 |
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| DOI：10.7511/jslx20105011 |
| KeyWord:suspension bridge buffeting structural internal forces random vibration pseudo-excitation method finite element method |
| Author | Institution |
| 刘高 |
中交公路规划设计院有限公司,北京 |
| 朱乐东 |
同济大学 土木工程防灾国家重点实验室,上海 |
| 项海帆 |
同济大学 土木工程防灾国家重点实验室,上海 |
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| Abstract: |
| Based on the pseudo-excitation method and the finite element method, a new random vibration method is developed for predicting buffeting internal forces of long-span bridges in the frequency domain. This method have two features: (1) the dynamic effect of the retain modes to the element internal forces is performed using traditional modal superposition method, while the contribution of the higher modes to the element internal forces is considered by pseudo-static method; (2) the element forces at the element ends include those caused by the node displacements as well as the element distributed loads. The method is then applied to the Tsing Ma suspension bridge to investigate the internal force responses of the bridge deck due to dynamic effect of multi-mode coupling, pseudo-static effect of higher modes, the effect of the element distributed loads and the buffeting loads acting on the main cables. The results show that the dynamic effect of multi-mode coupling is dominant in the internal force responses of the bridge deck, both the pseudo-static effect of higher modes and the effect of element distributed loads have modest influence, while the lateral buffeting internal forces increase significantly when the contributions of the buffeting loads acting on the main cables are considered. |
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