超大跨径半漂浮体系双塔双索面混合梁斜拉桥抗风分析
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摘要
超大跨径半漂浮体系双塔双索面混合梁斜拉桥常被用于航道等级高、水深条件复杂而无法设置大规模地锚的大江(河、海)中,该类桥梁结构刚度随跨度增大而降低,导致其在风力作用下的变形较大而容易产生震动,因此其抗风稳定问题显得尤为重要。为了研究此类斜拉桥的抗风稳定问题,以主跨1 200 m的超大跨度斜拉桥设计方案为例,采用MIDAS/Civil建立其空间有限元模型,从最大悬臂状态和成桥状态对结构的动力特性和抗风稳定性进行分析。结果表明,该桥主梁颤振临界风速均超过其颤振检验风速,满足规范要求。
As a cable system, continuous semi-floating double-pylon hybrid girder cable-stayed bridge is often used in bridges with increasing traffic volume, overload and limited deck width. As the span of this type of bridge increases gradually, the structure becomes more flexible, and its deformation under wind force is larger and more vibration-prone, so the problem of wind-resistant stability becomes increasingly important. In order to further analyze the wind-resistant stability of this kind of cable-stayed bridge, this paper takes the design scheme of a long-span cable-stayed bridge with a main span of 1200 m as an example, and MIDAS/Civil is used to establish its spatial finite element model, and the wind-resistant stability and dynamic characteristics of the structure are analyzed from the maximum cantilever state and the completed bridge state. It is concluded that the critical wind speed of flutter of the main girder of the bridge exceeds its flutter test wind speed and meets the requirements of the code.
As a cable system, continuous semi-floating double-pylon hybrid girder cable-stayed bridge is often used in bridges with increasing traffic volume, overload and limited deck width. As the span of this type of bridge increases gradually, the structure becomes more flexible, and its deformation under wind force is larger and more vibration-prone, so the problem of wind-resistant stability becomes increasingly important. In order to further analyze the wind-resistant stability of this kind of cable-stayed bridge, this paper takes the design scheme of a long-span cable-stayed bridge with a main span of 1200 m as an example, and MIDAS/Civil is used to establish its spatial finite element model, and the wind-resistant stability and dynamic characteristics of the structure are analyzed from the maximum cantilever state and the completed bridge state. It is concluded that the critical wind speed of flutter of the main girder of the bridge exceeds its flutter test wind speed and meets the requirements of the code.
引文
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[10]JTG/T 3360-01-2018,公路桥梁抗风设计规范[S].北京:人民交通出版社,2018.
[2]李林.大跨度结合梁斜拉桥抗风稳定分析[J].应用基础与工程科学学报,2012,(9):66-68.
[3]张新军,张丹.大跨度桥梁抗风研究的现状及展望[C].杭州市科协第二届学术年会,2005.
[4]秦建军.大跨度斜拉桥最大悬臂施工状态抖振响应及控制研究[D].长沙:湖南大学,2004.
[5]张茜.大跨度斜拉桥风致振动响应的非线性时程分析[D].西安:长安大学,2007.
[6]姜凯.大跨度混凝土斜拉桥动力分析[D].成都:西南交通大学,2009.
[7]鹿道凡.大跨度斜拉桥风振响应及风振控制研究[D].武汉:武汉理工大学,2010.
[8]Zhang XJ.Influence of some factors on the aerodynamic behavior of long-span suspension bridges[J].Journal of Wind Engineering and Industrial Aerodynamics,2007,95(3):149-164.
[9]Kien PH,Yamada H,Katsuchi H,et al.Study on static and dynamic instability of super long-span cable-stayed bridges[C].The Forth International Symposium on Computational Wind Engineering.Yokohuna,2006:777-780.
[10]JTG/T 3360-01-2018,公路桥梁抗风设计规范[S].北京:人民交通出版社,2018.