中国铁道科学2018，Vol.39Issue(3)：41-48,8.DOI:10.3969/j.issn.1001-4632.2018.03.06
特大跨度三塔铁路斜拉桥加劲措施的研究
Stiffening Measures for Triple-Tower Railway Cable-Stayed Bridge with Exceptionally Large Span
摘要
Abstract
Taking Dongting Lake Bridge of Menghua Railway,the first triple-tower railway cable-stayed bridge with exceptionally large span under construction at home and abroad,as the research background,the enhancement effects and economic benefits to increase the vertical stiffness of the bridge by adding horizontal stiffening cable on the top of towers,adding stable cable on the middle tower and adding 1 to 3 pairs of cross cables,were studied by finite element simulation and model test.Results show that the three reinforcement measures can significantly increase the vertical stiffness of the bridge.As long as the section area of the stiffening cable is increased,the ratio of deflection to span under static and live loads of Dongting Lake Bridge can be decreased from 1/436 without reinforcement to less than 1/500.When the ratio of deflection to span decreases to the same value between 1/500 and 1/600,considering the longitudinal displacement at the top of the middle tower and the bending-moment at the bottom of the middle tower,the effect of adding stable cables on middle tower is better than that of adding horizontal stiffening cables on the top of towers,and much better than that of adding cross cables.The economic benefit of adding stable cable on middle tower is far superior to increasing the stiffness of the main truss of bridge or towers directly.When the ratio of deflection to span is decreased from 1/436 to 1/500～1/600 by adding stable cables on middle tower,the additional material cost for adding stable cables on middle tower needs only RMB 1.65～6.46 million,the additional cost for increasing the stiffness of all the members of main truss needs RMB 58.83～169.43 million,the additional cost for increasing the stiffness of the three towers needs RMB 70.08～229.94 million,and the additional cost for increasing the stiffness of middle tower alone needs RMB 29.75～116.06 million.The research results have been applied to the design and construction of Dongting Lake Bridge of Menghua Railway.关键词
三塔铁路斜拉桥/大跨度/桥梁竖向刚度/加强措施/稳定索/增强效果/经济性Key words
Triple-tower railway cable-stayed bridge/Large span/Vertical stiffness of bridge/Strengthening measure/Stable cable/Enhancement effect/Economy分类
交通工程引用本文复制引用
张晔芝,张超超,易伦雄,周龙军..特大跨度三塔铁路斜拉桥加劲措施的研究[J].中国铁道科学,2018,39(3):41-48,8.基金项目
中国铁路总公司科技研究开发计划项目(2013G001-B) （2013G001-B）
