多塔斜拉桥刚度分析

随着国内、外多塔斜拉桥的兴建,斜拉桥的塔数不断增多,距离也不断增大,如何保证多塔斜拉桥的整体刚度,已经成为发展多塔斜拉桥这一结构体系所面临的关键问题。在分析多塔斜拉桥结构特点和力学特性的基础上,从塔、索、梁的刚度,设置辅助结构,采用部分斜拉桥形式三方面对三塔、四塔、四塔以上的多塔斜拉桥整体刚度影响进行分析,并对比总结国内、外已建与在建的多塔斜拉桥的刚度提高措施,得出了在不同塔数的情况下,较为有效地提高多塔斜拉桥体系整体刚度的方法,可为今后多塔斜拉桥的设计、施工提供技术参考。

Analysis of Rigidity of Multi-Pylon Cable-Stayed Bridges

With the growing construction of multi-pylon cable-stayed bridges at home and abroad,the numbers of the pylons used for such type of the bridges and the spacing distances among the pylons constantly increase.The way of how to ensure the global rigidity of the bridges becomes a critical issue confronted in development of the structural systems.On the basis of analysis of the structural characteristics and mechanical behavior of the bridges,the factors having influences on the global rigidity of the bridges having 3 pylons,4 pylons and more than 4 pylons are analyzed from three aspects of the rigidity of pylon,stay cable and girder,setting of auxiliary structure and utilization of extradosed bridge.The measures for improving the rigidity of the bridges having been completed and being constructed at home and abroad are compared and summarized and the effective method for improving the rigidity of the bridges having different numbers of the pylons is obtained.The method herewith may provide technical reference for design and construction of the multi-pylon cable-stayed bridges in the future.