特重车各轮相干桥面激励对斜拉桥随机振动的影响  

Influence of coherent bridge deck excitation from different wheels of an extra-heavy truck on random vibration of a cable-stayed bridge

作　　者：陈水生[1] 赵辉 李锦华[1] 朱朝阳 CHEN Shui-sheng;ZHAO Hui;LI Jin-hua;ZHU Zhao-yang(School of Civil Engineering and Architecture,East China Jiaotong University,Nanchang 330013,China;College of Architecture and Civil Engineering,Xinyang Normal University,Xinyang 464000,China)

机构地区：[1]华东交通大学土木建筑学院,江西南昌330013 [2]信阳师范学院建筑与土木工程学院,河南信阳464000

出　　处：《振动工程学报》2022年第2期318-330,共13页Journal of Vibration Engineering

基　　金：国家自然科学基金资助项目(12062006,11962006);江西省自然科学基金资助项目(20181BAB206043,20181BAB206041)。

摘　　要：为了研究特重车各轮相干桥面激励对斜拉桥振动响应的影响,根据特重车左右轮的相干函数关系和前后轮的时间滞后关系,推导并建立了特重车各轮相干桥面不平顺激励的功率谱矩阵。基于车桥耦合振动理论和虚拟激励法分析特重车各轮相干桥面激励对大跨度斜拉桥车致振动响应的影响,研究结果表明:特重车各轮相干桥面激励增大了斜拉桥振动响应的离散程度,桥梁振动响应随着各轮桥面激励相干强度的提高而增大。斜拉桥在特重车各轮相干桥面激励下的振动响应受不同相干函数模型的影响较小。特重车各轮相干非平稳桥面激励的斜拉桥振动响应离散程度大于各轮相干平稳桥面激励,桥梁振动响应标准差最大值随着车辆加速度的提高而增大。斜拉桥的车致振动响应对多轮多点相干桥面激励很敏感,其振动响应的离散程度随着特重车轴数的增加而增大。In order to study the influence of the coherent bridge deck excitation on the vibration response of a cable-stayed bridge,the power spectrum matrix of the coherent bridge deck excitations is derived and established according to the coherence function re-lationship of the left and right wheels and the time lag relationship between the front and rear wheels.Based on the vehicle-bridge coupled vibration theory and the pseudo excitation method,the influence of the coherent bridge deck excitation of each wheel of an extra-heavy truck on the vibration response of a long-span cable-stayed bridge is analyzed.The results show that the vibration re-sponse dispersion of the cable-stayed bridge is increased by the coherent deck excitation of each wheel of the extra-heavy truck.The vibration response of the bridge increases with the increase of the coherence strength.Besides,different coherent function models have little effect on the vibration response of cable-stayed bridge under coherent deck excitation.The discrete degree of the vibra-tion response of the cable-stayed bridge excited by the coherent non-stationary bridge deck is greater than that excited by the coher-ent stationary bridge deck.The maximum standard deviation of the bridge vibration response increases with the increase of vehicle acceleration.Moreover,the vehicle induced vibration response of the cable-stayed bridge is very sensitive to multi-wheel and multi-point coherent deck excitation,in which the dispersion degree of vibration response increases with the increase of the number of the extra-heavy truck axles.

关 键 词：车桥耦合 桥面不平顺 车辆各轮相干 虚拟激励法 特重车 

分 类 号：U441.3[建筑科学—桥梁与隧道工程] U448.27[交通运输工程—道路与铁道工程]