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工程力学  2015 

设置纵向大型液体粘滞阻尼器的大跨斜拉桥主梁纵向运动阻尼水平研究

DOI: 10.6052/j.issn.1000-4750.2014.02.0119, PP. 141-148

Keywords: 大跨度斜拉桥,阻尼水平,大型液体粘滞阻尼器,主梁限位,单自由度

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Abstract:

大跨斜拉桥减震耗能的一种典型应用是塔梁间设置纵向大型液体粘滞阻尼器,其参数选取以有效率的限制地震荷载作用下的主梁纵向位移以及改善主要构件地震力为目标。大跨斜拉桥的一阶纵飘振型处于长周期,远离场地卓越周期,此时主梁纵向位移响应对阻尼水平的增加不敏感。此种设计思路很可能导致阻尼器设计参数过大,从而为主梁纵向运动提供过大的阻尼水平。基于现有研究,采用单自由度评价模型及相应的等效阻尼比为评价参数。以某大型斜拉桥为典型工程实例,以全桥模型有限元分析与单自由度评价模型地震反应分析对比验证评价模型的可靠性,并以等效阻尼比和主梁纵向自由振动揭示塔梁间设置大型FVD为主梁纵向运动提供了超高水平阻尼比的现象。此种应用突破了FVD常规应用中的附加阻尼比界限,也改变了主梁的动力边界条件。

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