基于气动新模型的大跨度桥梁频域抖振分析 - 中国科技论文在线.pdf

中国科技论文在线 23 6 Vol.23 No.6 2006 6 June 2006 ENGINEERING MECHANICS 94 1000-4750(2006)06-0094-08 * 1 2 1 (1. 410082 2. 200092) Scanlan TU311.3A A NEW AERODYNAMIC METHOD FOR LONG-SPAN BRIDGE BUFFETING ANALYSIS * 1 2 1 ZHANG Zhi-tian , GE Yao-jun , CHEN Zheng-qing (1.Research center of wind engineering of Hunan University, Changsha 410082, China; 2. Bridge department of Tongji University, Shanghai 200092, China) Abstract: Put forward a new method for long-span bridge buffeting analysis which using quasi-steady aerodynamic stiffness and unsteady aerodynamic damping based directly on wind tunnel test. The wind tunnel test of bridge Segment model shows that the new aerodynamic model can describe the aerodynamic stiffness and damping properties of bridge structure more accurately. As an example, both the numerical results of the new model and traditional flutter-buffeting model were presented and compared for East Sea Bridge under wind loads. The computed results and wind tunnel test results show that the new model gives accurate outcomes and has explicit physical meanings. Key words: buffet; quasi-steady; aerodynamic stiffness; unsteady; aerodynamic damp Davenport () Scanlan Davenport () [1,2]