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系梁设置对双肢薄壁刚构桥地震响应影响分析

DOI: 10.13577/j.jnd.2015.0408, PP. 63-70

Keywords: 桥梁工程,地震响应,增量动力分析,系梁,双肢薄壁墩

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Abstract:

以一座典型双肢薄壁刚构桥为工程背景,采用增量动力分析(incrementaldynamicanalysis,IDA)方法,考虑行波效应,分析了系梁道数、系梁刚度等参数对桥梁远场地震响应的影响。结果表明,与系梁位置和刚度相比,地震响应受系梁道数影响较大;设置1道系梁可以明显降低支座在地震中的响应;设置2道以上系梁时,墩内、外肢地震响应差别显著,不利于发挥双肢墩材料性能。设置较多的系梁或者系梁位置不合理,易导致桥墩局部振动。对于跨度较大的?墩刚构桥,当因其它因素需要设置较多系梁时,建议对行波效应进行专门的抗震效应研究。

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