摘要
针对地铁列车运行引起的隧道和自由场动力响应的预测,提出一种计算方法。根据移动荷载作用下隧道及自由场的动力响应解,可以把地铁列车运行引起的振动问题归结到计算频率-波数域内的传递函数和频域内移动轴荷载的问题上,传递函数采用三维周期性有限元-边界元耦合的数值模型来计算,移动轴荷载主要考虑为频域内轨道不平顺激励下的轮轨接触力。利用此方法对北京地铁4号线北京大学东门站北侧区间地铁列车运行引起的隧道和自由场的振动响应进行了预测,并比较了普通无碴轨道和钢弹簧浮置板轨道的动力响应。结果表明:此方法具有很好的适用性;浮置板轨道具有很好的减振作用,但对低频段振动没有效果。
A method is presented to calculate the metro-train-induced vibrations in the tunnel and free field. Based on the analytical solution of dynamic response excited by the moving loads in the tunnel and free field, the vibrations induced by the passage of metro trains can be calculated if the transfer function in the frequencywavenumber domain and the moving axle loads in the frequency domain can be obtained. The transfer function is calculated using the three-dimensional coupled periodic finite element-boundary element model in the frequency- wavenumber domain, and the moving axle loads are considered as the contact force between wheel and rail due to the rail unevenness. The response in the tunnel and free field north of East Gate of Peking University station on line 4 of Beijing metro is predicted, and the vibration mitigation efficiency of a floating slab track is studied and compared with a general slab track. The results show that the method has good applicability and the floating slab track is an effective vibration reduction measure, but not effective for the vibrations at low frequencies.
出处
《工程力学》
EI
CSCD
北大核心
2010年第1期250-256,共7页
Engineering Mechanics
基金
国家自然科学基金项目(50538010
50848046)
中国比利时双边合作项目(BIL/04/17)
关键词
振动
动力响应预测
传递函数
移动轴荷载
浮置板轨道
vibration
dynamic response prediction
transfer function
moving axle loads
floating slab track
