摘要
为了探明调谐质量阻尼器(TMD)对冰击荷载作用下桥梁振动的抑制效果.以桥梁横向位移方差为减振评价指标,基于传递函数法、动能理论和模态分析法,确定了TMD的最优刚度、阻尼和最佳安装位置;采用有限元法建立了流冰-桥墩撞击模型,计算获得了流冰撞击力;通过分析不同质量比TMD下桥梁结构的动力学响应,研究了TMD对流冰撞击下桥梁的振动抑制特性.结果表明:采用有限元法计算的流冰撞击力峰值与规范计算结果基本吻合;流冰撞击桥墩引起的桥梁跨中和墩顶横向位移主频与桥梁二阶横向模态接近,TMD的最佳安装位置为墩顶处;TMD对冰击荷载作用下桥梁跨中和墩顶横向位移有较大的抑制作用,且对桥梁横向振动加速度也有一定的减振效果.
To investigate the damping effect of tuned mass damper(TMD)on bridge vibration subjected to floating ice collision load.The optimal stiffness,damping and optimal installation position of TMD are determined based on the transfer function method,kinetic energy theory and modal analysis method,with the variance of the lateral displacement of the bridge as the vibration damping evaluation index.Using the refined finite element model,the collision process of floating ice on bridge pier is simulated,and the floating ice collision loads are obtained.By analyzing the dynamic response of the bridge structure under different mass ratio of TMD,the vibration reduction characteristics of the bridge subjected to floating ice collision load are studied.The results show that the peak value of the ice collision load calculated by the finite element method is basically the same as that calculated by the code.The main lateral displacement frequencies of the bridge mid-span and pier top caused by the ice impact are basically the same as the second-order lateral mode of the bridge,so the optimal installation position of TMD is at the top of the pier.TMD can restrain the lateral displacement of bridge span and pier top under the ice collision load,and it also has a certain damping effect on the lateral vibration acceleration of the bridge.
作者
李鹏浩
和振兴
石广田
LI Peng-hao;HE Zhen-xing;SHI Guang-tian(School of Mechanical Engineering,Lanzhou Jiaotong University,Lanzhou 730070,China)
出处
《兰州交通大学学报》
CAS
2021年第2期88-94,100,共8页
Journal of Lanzhou Jiaotong University
基金
国家自然科学基金(51868037)
甘肃省科技计划项目(20JRA393)。
关键词
高速铁路
流冰撞击
调谐质量阻尼器
振动抑制
high-speed railway
floating ice collision
tuned mass damper
vibration suppression
