特大跨悬索桥的缆索体系优化
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摘要
以提高特大跨悬索桥的动力稳定性为目的,基于优化缆索体系的思路,对三种优化方案进行比较.综合考虑抗风性能、施工、经济等因素,通过力学分析,指出一种行之有效的空间索形体系.以某座主跨1 090 m的跨海悬索桥为算例,就实桥使用的平面索形与本文推荐的空间索形,利用自行编制的程序ECFS,分别计算出初始平衡状态下主缆与吊杆的无应力长度、坐标和张力.利用这些力学、几何参数在ANSYS中分别建立平面、空间索形模型,进行动力分析.经过对两种索形自振特性的对比,分析其振动性能的差异与原因,证实了该空间索形可以有效提高悬索桥的横向刚度、抗扭刚度,从而提升结构的动力稳定性.有可能成为大跨悬索桥的发展方向.
The effort is made in this paper to improve dynamic stability of extra long-span suspension bridge.Aiming at optimizing cable system,three optimization schemes are proposed and compared.One spatial cable system is put forward through mechanical analysis combined with a comprehensive analysis of their wind resistance performance,construction and economy.A sea-crossing bridge with an 1090m main span is taken as an example.The program ECFS is written to calculate non-stress length,coordinates and tension of main cables as well as hangers in the initial equilibrium state of spatial cable or plane cable suspension bridge.Using these mechanical and geometrical parameters,both plane cable model and spatial cable model are established to analyze self-vibration characteristics by ANSYS program.The comparision of dynamic characteristics is employed to analyze the difference between the vibration performance of the two kinds of cable systems and its corresponding causes.The results verify that the spatial cable system can effectively enhance bridge transverse stiffness and torsional stiffness,and further increase structural dynamic characteristics.It may become a developing direction of long-span suspension bridge.
The effort is made in this paper to improve dynamic stability of extra long-span suspension bridge.Aiming at optimizing cable system,three optimization schemes are proposed and compared.One spatial cable system is put forward through mechanical analysis combined with a comprehensive analysis of their wind resistance performance,construction and economy.A sea-crossing bridge with an 1090m main span is taken as an example.The program ECFS is written to calculate non-stress length,coordinates and tension of main cables as well as hangers in the initial equilibrium state of spatial cable or plane cable suspension bridge.Using these mechanical and geometrical parameters,both plane cable model and spatial cable model are established to analyze self-vibration characteristics by ANSYS program.The comparision of dynamic characteristics is employed to analyze the difference between the vibration performance of the two kinds of cable systems and its corresponding causes.The results verify that the spatial cable system can effectively enhance bridge transverse stiffness and torsional stiffness,and further increase structural dynamic characteristics.It may become a developing direction of long-span suspension bridge.
引文
[1]周念先,周世忠.特大跨径桥梁走势[J].中国公路,2002,(7):59-62.
[2]BROWNW C.Development of The Deck for The 3300m Span Messina Crossing[C]//Congress Report IABSE12 thCongress.Copenhagen,1996.
[3]梁鹏,肖汝诚,夏?,等.超大跨度缆索承重桥梁结构体系[J].公路交通科技,2004,21(5):53-56,69.
[4]ASTIZ MA.Flutter Stability of Very Long Suspension Bridges[J].Journal of Bridge Engineering,1998,3(3):132-139.
[5]KIM HO-KYUNG,LEE MYEONG-JAE,CHANG SUNG-PIL.Non-linear shape-finding analysis of a self-anchored suspensionbridge[J].Engineer Structures,2002,24:1547-1559.
[6]罗喜恒.悬索桥缆索系统的数值分析法[J].同济大学学报,自然科学版,2004,32(4):441-446.
[7]现代应用数学手册计算与数值分析卷[M].北京:清华大学出版社,2005.
[8]项海帆.高等桥梁结构理论[M].北京:人民交通出版社,2001:311-314.
[9]王晓明.空间索形自锚式悬索桥初始平衡状态分析[D].西安:长安大学,2007:61-69.
[10]赵卓,张哲,刘东旭.自锚式悬索桥主桥动力特性分析[J].世界地震工程,2006,22(3):84-88.
[11]周芬,尚守平,杜运兴.有限元建模对结构自振频率计算的影响[J].湖南大学学报:自然科学版,2006,33(5):10-15.
[2]BROWNW C.Development of The Deck for The 3300m Span Messina Crossing[C]//Congress Report IABSE12 thCongress.Copenhagen,1996.
[3]梁鹏,肖汝诚,夏?,等.超大跨度缆索承重桥梁结构体系[J].公路交通科技,2004,21(5):53-56,69.
[4]ASTIZ MA.Flutter Stability of Very Long Suspension Bridges[J].Journal of Bridge Engineering,1998,3(3):132-139.
[5]KIM HO-KYUNG,LEE MYEONG-JAE,CHANG SUNG-PIL.Non-linear shape-finding analysis of a self-anchored suspensionbridge[J].Engineer Structures,2002,24:1547-1559.
[6]罗喜恒.悬索桥缆索系统的数值分析法[J].同济大学学报,自然科学版,2004,32(4):441-446.
[7]现代应用数学手册计算与数值分析卷[M].北京:清华大学出版社,2005.
[8]项海帆.高等桥梁结构理论[M].北京:人民交通出版社,2001:311-314.
[9]王晓明.空间索形自锚式悬索桥初始平衡状态分析[D].西安:长安大学,2007:61-69.
[10]赵卓,张哲,刘东旭.自锚式悬索桥主桥动力特性分析[J].世界地震工程,2006,22(3):84-88.
[11]周芬,尚守平,杜运兴.有限元建模对结构自振频率计算的影响[J].湖南大学学报:自然科学版,2006,33(5):10-15.
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