To study the dymamic characteristics of single-tower self-anchored suspension bridges with spatial cables, the Dagu River Shipping Channel Bridge (a self-anchored suspension bridge with spatial cables and with span arrangement (80 + 190 + 260 + 80) m) of Qingdao Bay Bridge was cited as an example, the finite element analysis software MIDAS Civil 2006 was used to establish the three-dimensional model for the whole bridge and the 10 orders of the natural vibration characteristcs of the bridge were caculated. The anlaysis of the dynamic characteristics reveals that in addition to the vibration characteristics of suspension bridges, the self-anchored suspension bridge also has the vibration characteristics of cable-stayed bridges, the global siffness of the bridge decreases to some extent as compared to that of a gound-anchored suspension bridge and the natural period of vibration of the bridge therefore becomes rather long.%为了研究独塔空间缆索自锚式悬索桥动力特性,以青岛海湾大桥大沽河航道桥[跨径(80+190+260+80)m的空间缆索自锚式悬索桥]为背景,利用MIDAS Civil 2006有限元分析软件建立全桥三维模型,计算出其前10阶自振特性.通过对其动力特性进行分析发现,该自锚式悬索桥除了具有悬索桥的振动特性之外,还有斜拉桥的振动特性;自锚式悬索桥的整体刚度相比地锚式悬索桥有所降低,因而其固有周期较长.
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