移动荷载作用下三塔悬索桥的强迫振动研究
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摘要
针对泰州大桥开展结构动力特性计算,分析了不同移动速度以及不同移动荷载大小对于三塔两跨悬索桥结构动力响应的影响。结果表明,三塔两跨悬索桥的一阶竖弯振动基频约为0.08 Hz,远低于载重汽车的固有频率,不会形成共振条件。简单的移动荷载作用下三塔两跨连续支承悬索桥的内力、位移响应与同等静力荷载作用效果比较接近。移动荷载的质量越大、速度越大,结构的内力、位移响应就越大,并与车重呈近似正比例关系。结构内力、位移的荷载放大系数不随移动荷载质量的大小而改变。
Taking Taizhou Bridge for example,dynamic characteristics of the finite element model are analyzed and then the effects of different moving speeds and loads on dynamic response of three-tower two-span suspension bridge are studied.The result demonstrates that vertical bending of natural frequency is approximately 0.08 Hz,which is far below natural frequency loading truck,and will not form resonance condition.The response of force and displacement of three-tower two-span continuous suspension bridge under simply moving loads and equivalent static loads are the same.The structural will be greater when moving loads quantity and speed become greater and they have similar positive relationship.However,the load amplification factor of structural force and displacement does not vary with the quantity change of moving loads.
Taking Taizhou Bridge for example,dynamic characteristics of the finite element model are analyzed and then the effects of different moving speeds and loads on dynamic response of three-tower two-span suspension bridge are studied.The result demonstrates that vertical bending of natural frequency is approximately 0.08 Hz,which is far below natural frequency loading truck,and will not form resonance condition.The response of force and displacement of three-tower two-span continuous suspension bridge under simply moving loads and equivalent static loads are the same.The structural will be greater when moving loads quantity and speed become greater and they have similar positive relationship.However,the load amplification factor of structural force and displacement does not vary with the quantity change of moving loads.
引文
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[9]毛清华.公路桥梁的车辆振动研究[D].上海:同济大学,1987.
[2]沈世钊,徐崇宝,赵臣,等.悬索结构设计[M].北京:中国建筑工业出版社,2005.
[3]Chan Tommy H T,Guo Li,Li Zhaoxia.Finite element modelingfor fatigue stress analysis of large suspension bridges[J].Journalof Sound and Vibration,2003,261:443-464.
[4]ANSYS公司.Release10.0Documentation for ANSYS[DB].
[5]杨佑发,白文轩,魏建东.采用Ernst公式计算斜拉桥斜拉索振动特性的精度分析[J].世界地震工程,2008,6(2):52-55.
[6]Miao Changqing,Chen Liang,Feng Zhaoxiang.Study on effects ofenvironmental temperature on dynamic characteristics of TaizhouYangtze River Bridge[J].Engineering Sciences,2011,9(2):78-82.
[7]邓育林,彭天波,李建中,等.大跨度三塔悬索桥动力特性及抗震性能研究[J].振动与冲击,2008,27(9):105-110.
[8]刘斌.三塔悬索桥振动特性的研究[D].成都:西南交通大学,2009.
[9]毛清华.公路桥梁的车辆振动研究[D].上海:同济大学,1987.
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