轨道交通荷载下高层框架结构的动力响应
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摘要
为了减小轨道交通引起的环境振动对线路沿线建筑结构的影响,通过研究建筑结构在轨道交通引起的地面振动激励作用下的振动响应,以便采取相应措施降低轨道交通运行对结构的不利影响。利用ANSYS/LS-DYNA显式分析程序对轨道交通引起的地面三向、竖向和水平振动激励作用下20层框架结构的振动响应进行了分析,得到了不同振动激励作用下结构各层的振动响应,以及各层峰值速度随着结构高程的变化规律。研究指出在轨道交通振动荷载作用下,结构3个方向的振动速度峰值的最大值都出现在第1层,结构也没有出现常规所认为的那样存在随高程的放大效应,即"层数越高,质点的振动速度峰值越大"的现象,甚至在某些方向上呈现了相反的变化趋势。
In order to reduce the vibration influence caused by rail traffic to the structures along the lines,and take appropriate measures to reduce the adverse effects on the structure by studying laws of the ground vibrations caused by rail traffic.In this paper,we studied the vibration response of a twenty-floor frame structure under the three-floor,vertical and horizontal vibration excitation caused by rail traffic through ANSYS / LS-DYNA explicit analysis programs,and we know the vibration response of different structures under different vibration excitations,and the change of peak velocity with the elevation changing of the structure,pointing out that,under rail loads,the maximum of peak vibration velocities of the structure in the three directions appeared in the first layer,and the structure does not show the amplification effect with the height,that "the higher layers,the greater vibration peak velocity",even in some direction showing the opposite trend.
In order to reduce the vibration influence caused by rail traffic to the structures along the lines,and take appropriate measures to reduce the adverse effects on the structure by studying laws of the ground vibrations caused by rail traffic.In this paper,we studied the vibration response of a twenty-floor frame structure under the three-floor,vertical and horizontal vibration excitation caused by rail traffic through ANSYS / LS-DYNA explicit analysis programs,and we know the vibration response of different structures under different vibration excitations,and the change of peak velocity with the elevation changing of the structure,pointing out that,under rail loads,the maximum of peak vibration velocities of the structure in the three directions appeared in the first layer,and the structure does not show the amplification effect with the height,that "the higher layers,the greater vibration peak velocity",even in some direction showing the opposite trend.
引文
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[2]赵红军.地铁列车振动引起的地面多层建筑物的响应[D].北京:北京交通大学,2007.
[3]邓飞皇,莫海鸿,曾庆军.地铁运行振动诱发地层和地表动力响应分析[J].科学技术与工程,2007,7(3):348-351.
[4]谭泽新,石科,潘泓.城市轨道交通系统对邻近建筑物的振动分析[J].广东土木与建筑,2006(12):35-39.
[5]谢伟平,孙洪刚.地铁运行时引起的土的波动分析[J].岩石力学与工程学报,2003,22(7):1180-1184.
[6]王柏生,徐仲杰,杨英武.预测列车引起拟建建筑物的振动[J].浙江大学学报:工学版,2008,42(9):52-59.
[7]蔺新丽,蔡彬彬,张红英,等.基于ANSYS/LS-DYNA的高层框架结构爆破震动响应模拟[C]//第十一届中国煤炭学会爆破学术会议论文集.北京:[s.n.],2010:34-40.
[8]母恩喜,陈国平.基于ANSYS的高层框架结构地震响应分析[J].工程结构,2008,28(6):109-110.
[9]陈士海,魏海霞,杜荣强,等.建筑结构爆破地震效应分析[M].北京:煤炭工业出版社,2011.
[10]魏海霞.爆破地震波作用下建筑结构的动力响应及安全判据研究[D].青岛:山东科技大学,2010.
[11]黄志强.建筑结构对爆破振动响应的数值模拟研究[J].工程建筑,2009,39(增刊):193-195.
[12]苏佳胜,滕保华,薛宗林.计入衰减的地震波传播特性研究[J].工程地球物理学报,2010,7(5):608-612.
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