大跨度桥梁颤振时域的直接分析法  

Time domain flutter direct analysis of long-span bridges

作　　者：张鸣祥[1,2] 廖海飞 王建国 周晨曦[1] ZHANG Mingxiang;LIAO Haifei;WANG Jianguo;ZHOU Chenxi(School of Civil and Hydraulic Engineering,Hefei University of Technology,Hefei 230009,China;Anhui Civil Engineering Research Center for Disaster Prevention and Mitigation,Hefei 230009,China)

机构地区：[1]合肥工业大学土木与水利工程学院,安徽合肥230009 [2]土木工程防灾减灾安徽省工程技术研究中心,安徽合肥230009

出　　处：《合肥工业大学学报（自然科学版）》2022年第4期487-492,共6页Journal of Hefei University of Technology：Natural Science

基　　金：国家自然科学基金资助项目(52178135)。

摘　　要：文章采用三维空间内单位脉冲响应函数描述自激力的方法,改进传递函数最小二乘法的拟合方法,从自激力时域描述公式中分离出气动质量,使得公式中的时间历程与当前时间无关,消除了迭代计算中由自激力时域公式引起的荷载非线性,提高了计算速度和计算精度;通过ANSYS实现颤振时程分析,以具有理想平板截面的简支梁和马鞍山长江大桥右汊桥为例,进行数值计算,计算结果证实了文中方法的有效性与可靠性,并发现颤振导数连贯性对颤振临界风速和颤振频率的分析有较大影响。The method which describes the self-excited force using the unit impulse response function is extended in the 3D space and adopted.The fitting method of transfer function which is based on the least square method is improved,and the aerodynamic mass is separated from the self-excited force function which has no current time term in the time history term for relieving the load nonlinearity in the self-excited force function.The computing speed and accuracy in the iterative computation is enhanced.Taking the simply supported thin airfoil beam and the right branch of Ma’anshan Yangtze River Bridge for examples,the flutter numerical analysis in the time domain is achieved by using ANSYS.The result verifies the effectiveness and reliability of the method in this paper and indicates that the coherence of the flutter derivatives is important for the analysis of the flutter critical wind speed and frequency in the time domain.

关 键 词：大跨度桥梁 颤振 临界风速 时域分析 

分 类 号：U441.3[建筑科学—桥梁与隧道工程]