超大跨度斜拉桥空气静力稳定性研究  

Study on the aerostatic stability of super long-span cable-stayed bridges

作　　者：张新军[1] 虞周均 孙海凌 

机构地区：[1]浙江工业大学建筑工程学院,浙江杭州310014

出　　处：《浙江工业大学学报》2014年第2期182-189,共8页Journal of Zhejiang University of Technology

基　　金：浙江省自然科学基金资助项目(502118;Y104577)

摘　　要：空气静力稳定性(也称静风稳定性)是主跨超千米的超大跨度斜拉桥设计和研究的重要问题.采用三维非线性空气静力稳定性分析方法,对1 400m主跨的超大跨度斜拉桥进行了空气静力稳定性分析,并与同等主跨悬索桥的空气静力稳定性进行比较.在此基础上,分别就主梁的高度和宽度、桥塔结构型式、桥塔高跨比、边主跨比、辅助墩设置、拉索锚固方式等结构设计参数对超大跨度斜拉桥空气静力稳定性的影响进行了分析,并指出了关键的设计参数及其合理取值.结果表明:与同等主跨的悬索桥相比,斜拉桥的结构刚度更大,空气静力稳定性更好,适宜采用于超千米跨度的大跨度桥梁.超大跨度斜拉桥在增大主梁的高度和宽度、采用倒Y形桥塔并增大塔高、减小边跨长度、边跨设置辅助墩以及部分斜拉索地锚等情况下,都可以获得比较好的空气静力稳定性.The aerostatic stability is an important problem for the design and research of super long-span cable-stayed bridges with main span of kilometer-scale. By taking a super long-span cable-stayed bridge with main span of 1400m as an example, the aerostatic stability of the bridge was investigated by three-dimensional nonlinear aerostatic stability analysis, and also was compared with that of a suspension bridge with a similar main span. In addition, parametric analysis on the aerostatic stability of super long-span cable-stayed bridges was conducted involving the depth and width of the girder, structural pattern of the tower, the tower＇s height- to-span ratio, the side-to-main span ratio, the auxiliary piers in side span and the anchorage system of stay cables, etc, and the key design parameters and their reasonable values were presented. The results show that as being compared to the suspension bridge with similar main span, the cable-stayed bridge has greater structural stiffness and better aerostatie stability, and consequently is a suitable structure for super long-span bridges whose main span exceeds 1000m. The super long-span cable-stayed bridge can be more aerostatically stable under the cases that the girder＇s depth and width are increased, the inverted Y-shaped tower is used and the tower＇s height is increased, the side span is shortened, the auxiliary piers are installed in side span and the stayed cables are partially earth-anchored.

关 键 词：超大跨度斜拉桥 空气静力稳定性 设计参数 

分 类 号：U448.27[建筑科学—桥梁与隧道工程]