摘要
为进一步提升多塔斜拉桥的跨越能力,明确多塔斜拉桥的结构特征,对比分析了常规双塔斜拉桥和多塔斜拉桥在活载作用下的变形特点,通过对大量文献研究成果的整理分析,得出了各类提升多塔斜拉桥主塔刚度措施的优缺点.分析了跨中交叉布索的多塔斜拉桥的受力机理,解决了多塔斜拉桥整体刚度不足的力学缺陷,并以昆斯费里大桥为依托工程,验证了跨中采用交叉布索的多塔斜拉桥方案的可行性.研究结果表明,第1类措施容易引起结构整体自重增大,拉索有效支承效率降低,破坏了斜拉桥轻盈雅致的整体美感,建议辅助采用;第2类措施改变结构体系,有较高的效率,建议重点采用;第3类措施单独使用提升中塔纵向刚度的效果不明显,建议辅助采用.
In order to increase the spanning capability of multi-tower cable-stayed bridge,and to explore mechanical properties of multi-tower cable-stayed bridge,the deformation characteristics between cable-stayed bridge with twin tower and multi-tower are analyzed,through the analysis of a large amount of literature research results,the advantages and disadvantages of various kinds of tower stiffness measures are obtained.The new stiffening cable system,stress mechanism of the crossed cables,is analyzed,the mechanical defects of the overall stiffness of the multi-tower cable-stayed bridge are solved,and according to the Queensferry Crossing as a project case,the feasibility of the multi-tower cable-stayed bridge with crossed cables is verified.The results show that the first type of measures can easily cause the overall self-weight of the structure to increase,the effective support efficiency of cables is reduced,and the overall aesthetic feeling of the light and graceful of the cablestayed bridge is destroyed,it is supporting facilities.The second one has the high efficiency by changing the structure system,it is major measures.The third one are recommended to be adopted because of the vertical stiffness of tower is not enhancement obvious.
出处
《沈阳大学学报（自然科学版）》
CAS
2017年第6期490-496,共7页
Journal of Shenyang University：Natural Science
基金
陕西省交通运输厅科技资助项目(13-25k)
关键词
桥梁工程
多塔斜拉桥
交叉索
受力机理
刚度提升
bridge engineering
multi-tower cable-stayed bridge
crossed cables
stress mechanism
augment stiffness
