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三塔悬索桥纵向约束体系优化

, PP. 59-67

Keywords: 桥梁工程,三塔悬索桥,时程分析,纵向约束体系,静动力特性,弹性索,粘滞阻尼器

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Abstract:

?为确定三塔悬索桥的合理纵向约束体系,以泰州长江大桥为研究对象,综合考虑各静动力分项作用效应及作用效应组合,对纵向弹性索和粘滞阻尼器2种附加约束的设置位置及参数优化进行研究,重点分析了2种可行布置方案的合理参数选取,并在确定参数下,对比了2种可行方案的效果。结果表明:全漂浮体系、全阻尼器体系和全弹性索体系均不是理想的约束体系;可行的约束体系是仅中塔设置弹性索和中塔弹性索加边塔阻尼器体系,前者可显著减小梁端水平位移,并适当减小塔顶水平位移、梁端转角、主梁挠度并增加主缆抗滑系数,但地震作用下中塔受力集中,后者可改善中塔地震受力集中状况,但增大了边塔地震力;考虑到中塔受汽车作用控制而边塔受地震作用控制,以及粘滞阻尼器制造和维护困难,推荐采用仅在中塔与主梁间设置纵向弹性索的结构体系。

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