摘要
简易刚性悬索桥具有跨度大、施工快以及对环境要求低等特点,是我国西南地区常考虑的桥型之一。然而随着交通基础建设的快速发展,人们对桥梁运行时的舒适性及安全性的要求越来越高,桥梁在汽车和路面不平整度等因素的共同作用下会对车辆的行驶体验产生一定的影响。利用有限元软件ANSYS对山区的某简易刚性悬索桥梁进行模拟建模分析,并提取结构的自振频率和振型。参考功率谱统计法,利用谐波叠加法理论在MATLAB软件上模拟了路面不平度,分析路面不平度对车桥耦合振动响应的影响。同时参考云南地区低等级公路交通载荷特性,选取合适的车辆行驶速度、车重等车辆参数,通过位移耦合法建立车桥耦合模型,利用控制变量法改变车辆单一参数来分析不同车辆特性作用下桥梁的振动响应情况。以不同参数下悬索桥主要位置节点的竖向位移、加速度等响应的时程曲线,来分析路面不平度、车重、行驶车速等对悬索桥振动响应影响的规律。结果表明:车辆车速的增大、车辆车重的增加和路面粗糙等级增加,都会加大桥梁的振动响应,其中车速是影响桥梁竖向加速度振动响应主要的因素,车重是影响桥梁竖向位移响应的主要因素,路面不平度对桥梁的竖向加速度振动响应和竖向位移响应都有影响。并且,随着车辆速度的增加,路面不平度对结构的振动响应也会增加。基于此,可以为分析车致桥梁振动影响行人行走的舒适度及安全性提供理论基础,以选择合适的荷载工况来计算结构的振动响应,进而对桥梁舒适性进行评估。
Simple rigid suspension bridges,characterized by large spans,fast construction and low environmental requirements,are one of the bridge types often considered in the southwestern part of China.However,with the rapid development of transportation infrastructure,people are more concerned about the comfort and safety of bridges during operation.The requirements of the bridge are getting higher and higher,and the bridge will have a certain impact on the driving experience of vehicle under the combined action of factors such as the vehicle and the unevenness of the road.This paper uses the finite element software ANSYS to simulate and analyze a simple rigid suspension bridge in the mountainous area,and extract the natural frequency and mode shape of the structure.Referring to the power spectrum statistics method,the road surface unevenness is simulated on the MATLAB software by using the harmonic superposition method,and the influence of road surface unevenness on the coupled vibration response of the axle is analyzed.At the same time,with reference to the traffic load characteristics of low-grade highways in Yunnan,appropriate vehicle parameters such as vehicle speed and vehicle weight are selected,and a coupled model of vehicle and bridge is established through the displacement coupling method,and a single parameter of the vehicle is changed by the control variable method to analyze the vibration response of the bridge under the action of different vehicle characteristics.The time course curves of the vertical displacement and acceleration of the main nodes of the suspension bridge under different parameters are used to analyze the influence of road surface unevenness,vehicle weight and speed on the vibration response of the suspension bridge.The results show that:the increase of vehicle speed,the increase of vehicle weight and the increase of road surface roughness will increase the vibration response of the bridge,in which the vehicle speed is the main factor affecting the vertical acceleration vibration response
作者
王子绾
李睿
宁德飚
李晓章
刘书豪
Ziwan Wang;Rui Li;Debiao Ning;Xiaozhang Li;Shuhao Liu(School of Architecture and Engineering,Kunming University of Science and Technology,Kunming 650500,China;Yunnan Provincial Highway Science and Technology Research Institute,Kunming 650051,China;Guang’an District Transportation Bureau,Guang’an 638000,China)
出处
《钢结构（中英文）》
2023年第11期10-19,共10页
Steel Construction（Chinese & English）
基金
国家自然科学基金项目(51568029)。
关键词
山区悬索桥
车桥耦合振动
路面不平整度
安全
mountain suspension bridge
vehicle-bridge coupling vibration
road surface unevenness
safety
