【作者】 陈衍茂； 刘济科；

【Author】 Y.M.Chen,J.K.Liu (Department of Mechanics,Sun Yat-sen University,Guangzhou 510275,China)

【机构】 中山大学力学系；

【摘要】 研究了含立方扭转刚度悬索桥的极限环颤振。基于已发表的试验数据,采用最小二乘法,获得了桥梁颤振导数关于简约频率的多项式展开式。通过线性系统的特征矩阵特征值确定临界颤振值。研究发现,当风速大于颤振临界值时,非线性系统出现极限环。更多还原

【Abstract】 This paper presents a study of the nonlinear flutter of a bridge deck with cubic pitching stiffness.First,the flutter derivatives of bridge decks are obtained as polynomial functions of the reduced frequency,via the least square method on the basis of the published test results of the sectional Jiangyin Bridge deck’s models.The critical flutter values are determined by the eigenvalues of the system model without considering the nonlinearity.Limit cycle oscillations are found after the critical flutter speed.更多还原