通过对重庆鹅公岩大桥锚跨部分丝股张力的测试结果进行分析 ,得出索结构在初始轴力较小的情况下 ,其垂度对索结构的低阶频率值影响较大的结论。并利用动力有限元的分析方法 ,充分考虑了丝股垂度对其低阶频率大小的影响 ,对丝股的自振频率进行了计算 ,计算结果与测试值吻合良好。并得出了丝股垂度除了影响低阶频率的大小以外 ,对低阶频率的振型也有一定的影响的结论 Through the analysis of the test results of the tension of silk strands in the part of Chongqing Egongyan Bridge, it is concluded that the dip of the cable structure has a great influence on the low-order frequency of the cable structure under the condition of small initial axial force. By using the dynamic finite element method, the influences of the sag of the fillet on the low-order frequency of the fillets are fully considered. The natural frequencies of the fillets are calculated. The calculated results are in good agreement with the measured values. The conclusion is drawn that the sag of silk stock has a certain influence on the vibration modes of low-order frequencies besides the influence of the low-order frequency