钢桥塔的构造设计研究

Research on Structure Design of Steel Bridge Towers

在缆索支承桥中,采用钢桥塔符合可持续工程和绿色工程的结构设计新理念,而钢桥塔在我国的应用十分有限,现行的各种桥梁规范中也没有关于钢桥塔的规定。本文针对钢桥塔的稳定构造设计、塔柱截面构造优化、钢桥塔和混凝土基础的连接构造、塔形构造选择等问题进行了分析研究,开展了钢桥塔的稳定性试验,提出了防止钢桥塔失稳的措施,研究了塔柱截面构造的合理设置,对常用的塔-基连接的构造型式进行了适用性分析,并对几种常见塔形的受力性能进行了对比分析,研究结果可为钢桥塔的构造设计提供参考。

The application of steel bridge towers in cable-supported bridges is in accordance with the new structure design concept of sustainable and green engineering. However, the construction of steel bridge towers in China is still limited, the clauses on steel towers are still blank in the present bridge design code. In this paper the structure design of steel towers is focused on, a model test on the tower＇s stability behaviors is carried out, some measures to prevent the buckling of the towers are proposed, and the appropriate setting of the cross-section is studied. Moreover, the application principle of the common connecting methods on the towers and the concrete foundation is explicitly analyzed, and the mechanic behaviors of different types of towers are also compared. All the researches can provide the references for the structure design of steel bridge towers in China.