两自由度及三自由度桥梁断面颤振导数的强迫振动识别法

The identification of flutter derivatives for 2-DOF and 3-DOF bridge sectional model applying the forced vibration method

长期以来,桥梁断面颤振导数的识别都是大跨度桥梁颤抖振响应分析中的重点和难点问题。本文基于现有的非定常气动力和颤振导数的测试方法,首次在国内成功实现了在风洞中测试两自由度桥梁节段模型颤振导数的强迫振动法,并通过大量的试验验证了本测试装置的可靠性。在两自由度桥梁断面颤振导数的强迫振动法识别装置的基础上,作者和国防科技大学及同济大学风洞试验室联合研制开发了一套三自由度桥梁断面颤振导数的强迫振动法识别装置,进一步的研究正在进行中。

The identification of flutter derivatives for bridge sectional model has long been a key issue in longspan bridge flutter and buffeting analysis. Based on the present methods used in obtaining the unsteady aerodynamic forces and flutter derivatives, as the first successful experiment which has been conducted in China to test the unsteady aerodynamic forces in wind tunnel, the feasibility of the method is proved through numerous tests and abundant practice. Based on an identification device of forced vibration method for 2DOF flutter derivatives of bridges sectional model, the researcher, cooperated with some others from the National University of Defense Technology and Tongji University, has developed a set of identification device for a 3DOF flutter derivatives of bridges sectional model, and further research is being conducted.