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超大跨径部分地锚交叉索斜拉桥的索-梁锚固技术

, PP. 66-71

Keywords: 桥梁工程,交叉索斜拉桥,数值分析,索-梁锚固,部分地锚,超大跨径

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Abstract:

针对超大跨径斜拉桥主梁轴压力过大的问题,提出了部分地锚交叉索斜拉桥方案。特殊的结构体系使得交叉索段主梁的整体受力、索-梁锚固构造、局部应力分布与常规斜拉桥不同,有必要对其进行全面的分析。以1408m部分地锚交叉索斜拉桥方案与1408m常规体系斜拉桥方案为基础,分别建立了整体梁单元模型以及主梁局部模型,在整体受力分析的基础上,进一步分析了扁平钢箱梁在拉索交叉锚固作用下的应力分布。结果表明,新体系斜拉桥相较常规体系斜拉桥主梁最大轴力削减了28.7%;交叉索段主梁锚固区最大Mises应力为108MPa;拉索水平分力不再累积使得交叉索段主梁整体处于很低的应力水平。证明了新体系斜拉桥主梁受力的优越性以及新型交叉拉索索-梁锚固结构的合理性。

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