铁路高低塔斜拉桥受力特性研究
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摘要
以新建广州南沙港铁路西江特大桥的高低塔斜拉桥为工程背景,利用有限元模拟计算方法,开展高低塔斜拉桥受力特性及车桥动力响应研究。结果表明:桥塔及斜拉索刚度基本不会改变最大下挠点的位置;一侧桥塔刚度增加,最大下挠点将产生向另一侧桥塔移动的趋势;增加高塔刚度对减少结构下挠比增加低塔刚度更加明显;低塔侧斜拉索承担的活载比例较大,且其斜拉索活载索力及应力幅较大;该铁路高低塔斜拉桥受力合理可靠。
The new-built cable-stayed bridge with high and low towers of Xijiang super large bridge on Nansha Port Railway in Guangzhou was taken as the engineering background. Finite element simulation method was used to study the mechanical characteristics and vehicle-bridge dynamic response of the cable-stayed bridge with high and low towers. Results show that the stiffness of bridge tower and stay cable will not change the position of the maximum downward deflection point basically. When the stiffness of one side of bridge tower increases, the maximum downward deflection point will have a tendency to move towards the other side of bridge tower. Increasing the stiffness of the high tower is more obvious than increasing the stiffness of the low tower to reduce the downward deflection of the structure. The live load proportion of stay cables on the low tower side is larger, and the live load cable stress and stress amplitude of stay cables are larger. The cable-stayed bridge with high and low towers is reasonable and reliable in force.
The new-built cable-stayed bridge with high and low towers of Xijiang super large bridge on Nansha Port Railway in Guangzhou was taken as the engineering background. Finite element simulation method was used to study the mechanical characteristics and vehicle-bridge dynamic response of the cable-stayed bridge with high and low towers. Results show that the stiffness of bridge tower and stay cable will not change the position of the maximum downward deflection point basically. When the stiffness of one side of bridge tower increases, the maximum downward deflection point will have a tendency to move towards the other side of bridge tower. Increasing the stiffness of the high tower is more obvious than increasing the stiffness of the low tower to reduce the downward deflection of the structure. The live load proportion of stay cables on the low tower side is larger, and the live load cable stress and stress amplitude of stay cables are larger. The cable-stayed bridge with high and low towers is reasonable and reliable in force.
引文
[1] GIMSING N J,GEORGAKIS C T.Cable Supported Bridges:Concept and Design,Third Edition[M].New York:John Wiley & Sons.Ltd,2011.
[2] 任征.大跨度四线铁路高低塔混合梁斜拉桥桥塔设计[J].铁道标准设计,2018,62(8):68-73.(REN Zheng.Design of Pylons of Long-Span Four-Line Railway Cable-Stayed Bridge with Unequal-Height Pylons and Hybrid Girder [J].Railway Standard Design,2018,62(8):68-73.in Chinese)
[3] 赖亚平,邓宇,马振栋.公轨两用高低塔斜拉桥钢桁梁设计研究[J].钢结构,2016,31(9):67-72.(LAI Yaping,DENG Yu,MA Zhendong.Design and Study of Steel Truss Girder of Rail-Cum-Road Cable-Stayed Bridge with High and Low Pylons[J].Steel Construction,2016,31(9):67-72.in Chinese)
[4] 马振栋,卢光明,黄刚.高低塔固结体系斜拉桥结构优化设计方法[J].世界桥梁,2015,43(04):1-5.(MA Zhendong,LU Guangming,HUANG Gang.Methods of Optimized Configuration Design for Cable-Stayed Bridge of Rigid Fixity System with Two Unequal-Height Pylons[J].World Bridges,2015,43(4):1-5.in Chinese)
[5] 杨永清,叶浪,吴德宝.高低塔斜拉桥在温度作用下的静力特性研究[J].世界桥梁,2017,45(5):26-32.(YANG Yongqing,YE Lang,WU Debao.Study of Static Properties of Cable-Stayed Bridge with Pylons of Different Heights under Thermal Actions[J].World Bridges,2017,45(5):26-32.in Chinese)
[6] 徐恭义.千米级跨度铁路桥梁的受力性能研究[J].中国铁道科学,2011,32(2):56-60.(XU Gongyi.Research on the Mechanical Performance of Railway Bridges with Spans over 1 000 m [J].China Railway Science,2011,32(2):56-60.in Chinese)
[7] 裴炳志,叶见曙,李学文,等.辅助墩对大跨度高低塔PC斜拉桥的受力影响分析[J].桥梁建设,2005(6):23-26.(PEI Bingzhi,YE Jianshu,LI Xuewen,et al.Analysis of Influences of Subsidiary Piers on Mechanical Behavior of Long-Span PC Cable-Stayed Bridge with Unequal Height Pylons [J].Bridge Construction,2005(6):23-26.in Chinese)
[8] 谷振.高低塔PC斜拉桥设计参数分析与优化[D].西安:长安大学,2013.(GU Zhen.Analysis and Optimization of Design Parameters of PC Cable-Stayed Bridge with High and Low Towers [D].Xi'an:Chang'an University,2013.in Chinese)
[9] 杨孚衡,黎志光.考虑斜拉桥非线性的车桥耦合振动分析[J].中国铁道科学,2001,22(3):70-74.(YANG Fuheng,LI Zhiguang.Dynamic Response of Cable-Stayed Bridge under Moving Forces with Consideration of Non-Linearity of Stay-Cables [J].China Railway Science,2001,22(3):70-74.in Chinese)
[10] 熊建珍,高芒芒,俞翰斌.天兴洲长江大桥斜拉桥在地震作用下的车—桥耦合振动分析[J].中国铁道科学,2006,27(5):54-59.(XIONG Jianzhen,GAO Mangmang,YU Hanbin.Vehicle-Bridge Coupling Vibration Analysis of Cable-Stayed Bridge of Tianxinzhou Yangtze River Bridge under Earthquakes[J].China Railway Science,2006,27(5):54-59.in Chinese)
[2] 任征.大跨度四线铁路高低塔混合梁斜拉桥桥塔设计[J].铁道标准设计,2018,62(8):68-73.(REN Zheng.Design of Pylons of Long-Span Four-Line Railway Cable-Stayed Bridge with Unequal-Height Pylons and Hybrid Girder [J].Railway Standard Design,2018,62(8):68-73.in Chinese)
[3] 赖亚平,邓宇,马振栋.公轨两用高低塔斜拉桥钢桁梁设计研究[J].钢结构,2016,31(9):67-72.(LAI Yaping,DENG Yu,MA Zhendong.Design and Study of Steel Truss Girder of Rail-Cum-Road Cable-Stayed Bridge with High and Low Pylons[J].Steel Construction,2016,31(9):67-72.in Chinese)
[4] 马振栋,卢光明,黄刚.高低塔固结体系斜拉桥结构优化设计方法[J].世界桥梁,2015,43(04):1-5.(MA Zhendong,LU Guangming,HUANG Gang.Methods of Optimized Configuration Design for Cable-Stayed Bridge of Rigid Fixity System with Two Unequal-Height Pylons[J].World Bridges,2015,43(4):1-5.in Chinese)
[5] 杨永清,叶浪,吴德宝.高低塔斜拉桥在温度作用下的静力特性研究[J].世界桥梁,2017,45(5):26-32.(YANG Yongqing,YE Lang,WU Debao.Study of Static Properties of Cable-Stayed Bridge with Pylons of Different Heights under Thermal Actions[J].World Bridges,2017,45(5):26-32.in Chinese)
[6] 徐恭义.千米级跨度铁路桥梁的受力性能研究[J].中国铁道科学,2011,32(2):56-60.(XU Gongyi.Research on the Mechanical Performance of Railway Bridges with Spans over 1 000 m [J].China Railway Science,2011,32(2):56-60.in Chinese)
[7] 裴炳志,叶见曙,李学文,等.辅助墩对大跨度高低塔PC斜拉桥的受力影响分析[J].桥梁建设,2005(6):23-26.(PEI Bingzhi,YE Jianshu,LI Xuewen,et al.Analysis of Influences of Subsidiary Piers on Mechanical Behavior of Long-Span PC Cable-Stayed Bridge with Unequal Height Pylons [J].Bridge Construction,2005(6):23-26.in Chinese)
[8] 谷振.高低塔PC斜拉桥设计参数分析与优化[D].西安:长安大学,2013.(GU Zhen.Analysis and Optimization of Design Parameters of PC Cable-Stayed Bridge with High and Low Towers [D].Xi'an:Chang'an University,2013.in Chinese)
[9] 杨孚衡,黎志光.考虑斜拉桥非线性的车桥耦合振动分析[J].中国铁道科学,2001,22(3):70-74.(YANG Fuheng,LI Zhiguang.Dynamic Response of Cable-Stayed Bridge under Moving Forces with Consideration of Non-Linearity of Stay-Cables [J].China Railway Science,2001,22(3):70-74.in Chinese)
[10] 熊建珍,高芒芒,俞翰斌.天兴洲长江大桥斜拉桥在地震作用下的车—桥耦合振动分析[J].中国铁道科学,2006,27(5):54-59.(XIONG Jianzhen,GAO Mangmang,YU Hanbin.Vehicle-Bridge Coupling Vibration Analysis of Cable-Stayed Bridge of Tianxinzhou Yangtze River Bridge under Earthquakes[J].China Railway Science,2006,27(5):54-59.in Chinese)