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以某输油管道桥的设计方案为背景,讨论了该悬索桥的动力特性以及传输介质质量、主缆间的交叉网和水平索系与水平面的夹角对悬索管道桥动力特性的影响。研究表明:大跨度悬索结构由于柔度较大,频率分布较为密集,控制结构振动响应的一阶竖向弯曲和横向弯曲频率的数值都较低,传输介质的计入较大地降低了结构的各阶频率,两条主缆间添加轻质高强交叉网后,结构的扭转刚度得到显著提高,不同水平索系与水平面的夹角影响竖弯和侧弯基频,对扭转刚度影响不大。
Taking the design of an oil pipeline bridge as the background, the dynamic characteristics of the suspension bridge, the quality of the transmission medium, the influence of the crossing angle between the main cable and the horizontal line on the dynamic characteristics of the cable-stayed bridge are discussed. The results show that the first-order vertical bending and transverse bending frequency of the vibration response of the control structure are low due to the large flexibility and large frequency distribution of the long-span suspension structure. The calculation of the transmission medium greatly reduces the structural The torsional stiffness of the structure is significantly increased after the light-weight cross net is added between the two main cables at different frequencies. The horizontal and vertical angles of different horizontal cables affect the vertical torsional stiffness and the bending frequency, and have little effect on the torsional stiffness.