大跨径斜拉桥索塔锚固区钢锚梁受力性能分析
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摘要
针对某水道主航道大跨径斜拉桥索塔锚固区钢锚梁结构空间受力复杂的问题,运用ANSYS有限元软件建立索塔锚固区钢锚梁局部精细化有限元模型,对其在最大索力作用下空间受力特性进行分析。结果表明:钢锚梁最大等效应力为228 MPa,发生在承压板N3与承剪板交界处,各板件应力均小于容许应力值318.2 MPa,满足规范要求;拉索索力的空间非对称性对钢锚梁结构受力影响较大,以致左、右锚室受力不完全一致,设计和施工时应予以考虑。
To solve the complex spatial force performance of the steel anchor beam in pylon anchorage zone of a main channel bridge,local refined finite element model of the steel anchor beam was established using the software ANSYS and the spatial force characteristics under the action of the maximum cable force were analyzed.The results indicate that the maximum equivalent stress of the steel anchor beam is 228 MPa,which occurs at the junction of the bottom plate N3 and the shear plate.The stress of each plate is less than the allowable stress value of 318.2MPa and can meet the relevant requirement in the codes.The spatial asymmetry of the cable force has great influence on the force performance of the steel anchor beam structure,so that the force performance on the left and right anchor chambers are not exactly the same.It should be taken into account in the design and construction.
To solve the complex spatial force performance of the steel anchor beam in pylon anchorage zone of a main channel bridge,local refined finite element model of the steel anchor beam was established using the software ANSYS and the spatial force characteristics under the action of the maximum cable force were analyzed.The results indicate that the maximum equivalent stress of the steel anchor beam is 228 MPa,which occurs at the junction of the bottom plate N3 and the shear plate.The stress of each plate is less than the allowable stress value of 318.2MPa and can meet the relevant requirement in the codes.The spatial asymmetry of the cable force has great influence on the force performance of the steel anchor beam structure,so that the force performance on the left and right anchor chambers are not exactly the same.It should be taken into account in the design and construction.
引文
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[12]邵旭东,何东升,李立峰.钢锚梁-钢牛腿组合结构水平受力机理试验[J].中国公路学报.,2014,27(4):55-61.
[2]刘建军,王学敏.红水河特大桥钢牛腿-钢锚梁组合锚固结构设计研究[J].中外公路,2016,36(06):127-133.
[3]张家元,丁望星,朱世峰.荆岳长江公路大桥索塔锚固钢锚梁结构体系分析[J].桥梁建设,2015,45(2):89-93.
[4]张奇志,尹夏明,郑舟军.钢锚梁索塔锚固区受力机理分析与约束方式比选[J].桥梁建设,2012,42(6):50-56.
[5]Breen J E,Burdet O,Roberts C,et al.Anchorage Zone Reinforcement for Post-tensioned Concrete Girders[R].Austin:The University of Texas,1991.
[6]Lundgren K,Magnusson J.Three-dimensional Modeling of Anchorage Zones in Reinforced Concrete[J].Journal of Engineering Mechanics,2001,127(7):693-699.
[7]项贻强,易绍平,杜晓庆,等.南京长江二桥南汊桥斜拉索塔节段足尺模型的研究[J].土木工程学报,2000,33(1):15-22.
[8]Su Q,Yang G,Qin F,et al.Investigation on the Horizontal Mechanical Behavior of Steel-concrete Composite Cable-pylon Anchorage[J].Journal of Constructional Steel Research,2012,72:267-275.
[9]张奇志,李明俊.斜拉桥钢-混组合索塔锚固区节段模型试验研究[J].桥梁建设,2006(3):16-19.
[10]狄谨,周绪红,游金兰,等.钢箱梁斜拉桥索塔锚固区的受力性能[J].中国公路学报,2007,20(4):48-52.
[11]王冲,周莉,孙东利,等.独塔斜拉桥钢桥塔锚固区钢锚箱应力分析[J].桥梁建设,2015,45(3):51-57.
[12]邵旭东,何东升,李立峰.钢锚梁-钢牛腿组合结构水平受力机理试验[J].中国公路学报.,2014,27(4):55-61.