摘要
为了研究重车各轮相干桥面不平顺激励对桥梁振动响应的影响,首先根据车辆左右轮的相干函数关系和前后轮的时间滞后关系,推导重车各轮桥面激励输入的功率谱矩阵,建立多轮多点桥面不平顺激励的频域模型。然后,以1辆四轴重车为研究对象,基于虚拟激励法分析重车各轮相干桥面激励对1座连续T梁桥振动响应的影响。研究结果表明:重车各轮相干增大了桥面不平顺的激励强度,引起桥梁振动响应的增加,且桥梁振动响应随着相干强度的提高而增大;不同相干函数模型的桥梁振动响应大小各不相同,但都能反映重车各轮相干桥面激励的桥梁振动响应规律;车辆各轮同步激励的桥梁振动响应最大,车辆各轮桥面激励相干的桥梁振动响应次之,而仅考虑重车各轮桥面激励时间滞后的桥梁振动响应最小;非平稳桥面激励的桥梁振动响应大于平稳激励,重车行驶的加速度和初始速度越大,桥梁振动响应就越大;不同荷载工况下,重车荷载直接作用的T梁振动响应大于非直接作用的T梁;桥梁振动响应随着桥面路况的恶化而增大,振动响应的均方根值成倍增加;多轴重车对桥面不平顺激励很敏感,相同的车辆载重量,桥梁振动响应随车辆轴数的增加而增大,且整体车引起的桥梁振动响应大于拖挂车。该研究结果不仅可为桥梁的建造和管养提供参考,而且为重车过桥的限速和限重提供了理论依据,充分表明加强桥面养护的必要性。
In order to study the influence of coherent bridge deck excitation of each wheel of the heavy vehicle on the vibration response of the bridge.The input power spectrum matrix of bridge deck excitation for each wheel of the heavy vehicle was derived,according to the coherence function relationship of left and right wheels and the time lag relationship of front and rear wheels,and the frequency domain model of multi wheel and multi-point deck irregularity excitation was established.A four-axle heavy truck was taken as the research object,the influence of coherent bridge deck excitation of each wheel of the heavy vehicle on the vibration response of a continuous T-beam bridge was analyzed by using the pseudo excitation method.The results show that the coherence of each wheel of the heavy vehicle increases the excitation intensity of the bridge deck irregularity and increases the vibration response of the bridge,the vibration response of the bridge increases with the increase of the coherence strength.The vibration responses of the bridge is different under different coherence function models,but they can reflect the vibration response law of bridge under the coherent bridge deck excitation of each wheel of the heavy vehicle.The vibration response of the bridge under the synchronous bridge deck excitation of each wheel of the heavy vehicle is the largest,followed by the vibration response of the bridge under the coherent bridge deck excitation of each wheel of the heavy vehicle,and the vibration response of the bridge considering only the lag of bridge deck excitation time of each wheel is the least.The vibration response of the bridge excited by non-stationary bridge deck irregularity is greater than that of the stationary excitation.The greater the acceleration and initial speed of the heavy vehicle,the greater the vibration response of the bridge.Under different load cases,the vibration response of T-beam directly under heavy vehicle load is greater than that under indirect load.The vibration response of the bridge
作者
陈水生
赵辉
李锦华
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,Jiangxi,China)
出处
《长安大学学报（自然科学版）》
CAS
CSCD
北大核心
2021年第4期43-55,共13页
Journal of Chang’an University(Natural Science Edition)
基金
国家自然科学基金项目(12062006,11962006)
江西省自然科学基金项目(20181BAB206043,20181BAB206041)。
关键词
桥梁工程
桥梁随机振动
虚拟激励法
重车各轮相干
桥面不平顺
车桥耦合
bridge engineering
random vibration of bridge
pseudo excitation method
all wheels of heavy vehicle are coherent
irregularity of bridge deck
vehicle-bridge coupling
