弹性支座对桥梁车致振动的隔振效果研究

发布时间：2018-04-24 21:09

本文选题：车-线-桥系统 + 弹性支座　；参考：《工程力学》2015年04期

【摘要】：为探讨列车高速通过桥梁时传递到桥墩的振动受弹性支座的影响,建立了12个自由度的弹簧-阻尼单元模拟支座,嵌入到车-线-桥耦合振动分析模型中。以高速铁路上典型的32 m混凝土双线简支梁桥为研究对象,采用包含支座单元的车-线-桥耦合振动分析程序进行仿真计算。结果表明:车辆的轮重减载率和竖向振动加速度受支座竖向刚度的影响很小;支座竖向刚度降低,桥梁响应中的静力成分逐渐增大,动力成分则先逐渐减小,再逐渐增大;采用弹性支座,墩顶全频域内的减振效果主要取决于优势频段20Hz~80Hz频率范围的振动衰减量;弹性支座隔振系统的自振频率为10Hz~20Hz,能够吸收中高频振动,放大自身频率范围振动,反映出弹性支座在中、高频段具有很好的隔振性能。
[Abstract]:In order to investigate the effect of elastic support on the vibration of train passing through the bridge at high speed, a spring damping element simulation support with 12 degrees of freedom was established and embedded into the coupled vibration analysis model of vehicle-line-bridge. The typical 32 m concrete double-line simply supported beam bridge on high-speed railway is studied. The coupled vibration analysis program of vehicle-line-bridge with bearing element is used to simulate and calculate the vibration. The results show that the wheel load reduction rate and the vertical vibration acceleration of the vehicle are little affected by the vertical stiffness of the bearing, while the static component of the bridge response increases gradually, and the dynamic component decreases gradually, and then increases gradually. With elastic support, the damping effect of pier top in full frequency domain mainly depends on the vibration attenuation in the 20Hz~80Hz frequency range of dominant frequency band, and the natural frequency of the elastic support isolation system is 10 Hz ~ 20 Hz, which can absorb the medium-high frequency vibration and amplify its own frequency range vibration. It shows that the elastic bearing has good vibration isolation performance in high frequency range.
【作者单位】：西南交通大学高速铁路线路工程教育部重点实验室;西南交通大学土木工程学院;
【基金】：国家自然科学基金项目(51378429,51308469) 教育部新世纪优秀人才支持计划项目(NCET-10-0701) 国家高技术研究发展计划(863计划)项目(2011AA11A103) 国家科技支撑计划课题项目(2012BAG05B02) 高等学校博士学科点专项科研基金项目(20110184110020)
【分类号】：U441.3;U443.36

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