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中文摘要：
针对桥梁颤振机理研究的关键问题即颤振驱动机理和颤振形态，建立了一种能同时研究桥梁振动特征参数与断面气动外形参数的定量关系，以及颤振发生过程中和颤振发生点各自由度运动耦合效应的二维三自由度耦合颤振分析方法．然后，以这种方法为理论工具，从新的角度对闭口箱梁和分离双主梁两类典型桥梁断面的颤振机理问题进行了研究．在颤振驱动机理和颤振形态研究中，澄清了以往模糊甚至错误的认识，得到了有意义的结论．
英文摘要：
In the field of flutter mechanism research concerning long-span bridges, flutter driving mechanism and flutter modality are two key problems. A two-dimensional 3 degree of freedom（DOE） coupling flutter analysis method （2d-3DOF method） has been introduced to investigate both the relationship between systematic oscillation parameters of three degrees of freedom and aerodynamic derivatives obtained through free vibration method, and the coupling effects of degrees of freedom in flutter instability. With this fundamental method and sectional model tests, the flutter mechanism of two representative sections for long-span bridges, closed box section and two-isolated-girder section are investigated. The influence of the variation of deck configuration on the flutter-driving mechanism and the flutter modality of bridge deck sections are also studied and valuable conclusions are drawn in this paper.
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