黏滞阻尼器对高速列车-大跨斜拉桥耦合系统的减震分析

Damping Analysis of Viscous Damper on Coupling System for High-Speed Trains and Long-Span Cable-Stayed Bridges

以某主跨为400 m的双塔双索面斜拉桥为例,基于ANSYS和SIMPACK联合仿真分析平台,运用带悬挂系统的多刚体建立高速列车模型,应用三维有限元建立斜拉桥模型,采用Maxwell非线性力学模型模拟黏滞阻尼器,输入轨道不平顺和修正后的El Centro地震波,进行地震作用下车桥耦合系统振动分析,研究地震强度和黏滞阻尼器参数对车桥动力响应的影响。结果表明:耦合系统振动响应随地震强度的增大而增大,地震强度对耦合系统横向响应的影响大于竖向,列车脱轨系数和轮轴横向力在地震强度超过0.10g后增速明显加快;设置横向黏滞阻尼器后,耦合系统的横向动力响应均有明显下降;能起到减小耦合系统振动响应的阻尼器参数为速度指数α在[0.3,0.6]、阻尼系数在[4000,8000]kN·(m·s^(-1))^(-α)的任意组合,耦合系统减震效果最优的阻尼器参数组合为速度指数取0.6、阻尼系数取8000 kN·(m·s^(-1))^(-α),此时减震率平均值为38.3%。

Taking a double-pylon and double-cable plane cable-stayed bridge with the main span of 400 m as an example,based on the ANSYS and SIMPACK co-simulation analysis platform,the high-speed train was modeled by a multi-rigid body model with suspension system,and the cable-stayed bridge was modeled by a three-dimension finite element model.The Maxwell nonlinear mechanical model was adopted to simulate viscous dampers.The track irregularities and corrected EI Centro seismic waves were applied to analyze the vibration of the train-bridge coupling system under seismic actions,and the effects of seismic intensity and viscous damper parameters on the train-bridge dynamic responses were studied.The results show that the vibration response of the coupling system increases with the increase of seismic intensity,and the effect on lateral response of the coupling system is greater than that on the vertical.The train derailment coefficient and the wheel-axle lateral force significantly increase since the seismic intensity has exceeded 0.10g.The lateral dynamic response of the coupling system is significantly reduced with the application of the lateral viscous damper.The damper parameters that can reduce the vibration response of the coupling system are enabled by arbitrary combinations of velocity index in the range of[0.3,0.6]and damping coefficient in the range of[4000,8000]kN·(m·s^(-1))^(-α).When the velocity indexαtakes 0.6 and the damping coefficient 8,000 kN·(m·s^(-1))^(-α)for the damper parameter combination,the coupling system performs the optimal damping effect.In this instance,the average damping rate is 38.3%.