中文摘要：

A 3D 为 Sutong 留下来电缆线的桥(SCB ) 的有限元素(FE ) 模型基于 ANSYS 被建立。桥的动态特征用一个 subspace 重复方法被分析。基于记录的风数据，测量系列表达式用非线性的最少平方的回归方法被介绍。在桥地点的狂暴的风被模仿基于光谱表示方法和快速傅里叶变换技术。桥的动态特征上的一些关键结构的参数和措施的影响被调查。这些参数包括死了的负担紧张，以及钢盒子 girder 的垂直、侧面、扭力的僵硬。另外，在钢盒子 girder 的颤动模式上在塔和 girder 之间采用的连接设备的有弹性的僵硬的影响被调查。分析证明垂直、侧面、扭力的 buffeting 排水量，回答作为死者逐渐地减少的所有装载紧张增加。动态特征和 SCB 的结构的 buffeting 排水量反应被钢盒子 girder 的垂直、扭力的僵硬仅仅稍微影响，并且当侧面的僵硬增加，侧面、扭力的 buffeting 排水量回答逐渐地减少。这些结果为动态分析提供一本参考书并且 super-long-span 设计留下来电缆线的桥。

英文摘要：

A 3D finite element （FE） model for the Sutong cable-stayed bridge （SCB） is established based on ANSYS. The dynamic characteristics of the bridge are analyzed using a subspace iteration method. Based on recorded wind data, the measured spectra expression is presented using the nonlinear least-squares regression method. Turbulent winds at the bridge site are simulated based on the spectral representation method and the FFT technique. The influence of some key structural parameters and measures on the dynamic characteristics of the bridge are investigated. These parameters include dead load intensity, as well as vertical, lateral and torsional stiffness of the steel box girder. In addition, the influence of elastic stiffness of the connection device employed between the towers and the girder on the vibration mode of the steel box girder is investigated. The analysis shows that all of the vertical, lateral and torsional buffeting displacement responses reduce gradually as the dead load intensity increases. The dynamic characteristics and the structural buffeting displacement response of the SCB are only slightly affected by the vertical and torsional stiffness of the steel box girder, and the lateral and torsional buffeting displacement responses reduce gradually as the lateral stiffness increases. These results provide a reference for dynamic analysis and design of super-long-span cable-stayed bridges.