摘要
以苏通大桥结构形式为基本模式,在现有制造和施工水平的假定条件下,研究斜拉桥的极限跨径。研究通过利用大型空间有限元软件ANSYS及简化模型的计算分析,结合对目前桥梁施工设备能力的调查分析,从斜拉桥的施工可行性,施工过程中关键技术可实现性和施工安全性出发,对斜拉桥可能达到的跨径进行了定量分析。研究中主要考虑了斜拉索的张拉能力,施工过程强度和线形控制,施工稳定性几个方面。研究结果显示,采用苏通大桥的桥型结构和施工技术,斜拉桥可以实现的跨径为1 500 m。增大跨径的途径也在文中进行了探讨。
On the basis of the structure figure of Sutong Bridge, the ultimate span of cable-stayed bridge with current construction technique is discussed in this paper. From the viewpoint of manufacture capability, key construction technique feasibility and construction safety, the quantitative analysis of ultimate span of cablestayed is carried out by way of calculating with FEM and simplified model method accompanied with investigation of capability of construction device. The tension capacity of the jack, the controllability of strength and figuration of structure during erection process, and stability of structure are considered in the study. The result shows that the ultimate span of cable-stayed bridge is 1 500 m with the construction technique used in the construction of Sutong Bridge. The ways to enhance ultimate span are also discussed.
基金
国家科技支撑计划项目(2006BAG04B00)
关键词
斜拉桥
极限跨径
施工可行性
cable-stayed bridge
ultimate span
construction feasibility
