基于梁格桥梁模型的过桥车辆轴载识别  

Axle-load Identification of Vehicles Crossing Bridge Based on Grillage Bridge Model

作　　者：姚庆 武隽[2] 边一纯 杨铭[2] 司慧龙 YAO Qing;WU Jun;BIAN Yichun;YANG Ming;SI Huilong

机构地区：[1]陕西省交通规划设计研究院有限公司,陕西西安700075 [2]长安大学,陕西西安710064

出　　处：《城市道桥与防洪》2023年第10期79-85,M0009,共8页Urban Roads Bridges & Flood Control

摘　　要：中国交通量随着经济发展整体处于上升趋势,对交通基础设施的使用性、耐久性和安全性造成了很大的压力。因此,有效地识别移动车载对公路交通基础设施的安全性具有重要意义。基于空间梁格桥梁模型建立移动车载识别模型,相比于单主梁模型和实体模型,能够有效地考虑车辆不同横向行驶位置对车载识别的影响。以一座简支T梁桥为例,通过数值模拟探究了应变测点数、信号噪声、车速、路面粗糙度和车轴载作用位置对车辆动载和静载识别精度的影响。结果表明,基于空间梁格法的动轴载识别误差在10%-19%的之间,静轴载识别误差在8%以内。动轴载与静轴载的识别误差值变化规律一致:识别误差值随着测点数的增加而减小,随着噪声的增大和路面粗糙度等级的增加而增大,车载作用位置离桥梁中线越近,动轴载识别精度越高。然而,车速变化对动轴载的误差影响无明显规律。The traffic volume in China is all on the rise with the economic development,which has caused the great pressure on the usability,durability and safety of traffic infrastructure.Therefore,it is of great significance to effectively identify the moving vehicle load on the safety of highway traffic infrastructure.The moving vehicle-load identification model is established based on the spatial grillage bridge model.Compared with the single-girder model and solid model,the spatial grillage bridge model can efficiently consider the influence of different lateral driving positions of the vehicle on the vehicle-load identification.Taking a simple-supported T-girder bridge as an example,the influences of the number of strain measuring points,signal noise,vehicle speed,pavement roughness and axle-load action position on the identification accuracy of vehicle dynamic and static loads are explored through numerical simulation.The results show that the dynamic-axle load identification error based on the spatial grillage method is 10%~19%,and the static-axle load identification error is within 8%.The identification error values of dynamic-axle load and static-axle load are consistent with each other.The identification error value decreases with the increase of the number of measuring points,and increases with the increase of the noise and the increase of pavement roughness level.The closer the vehicle driving is to the centerline of the bridge,the higher the identification accuracy of the dynamic-axle load.Nevertheless,the change of vehicle speed has no obvious effect on the error of the dynamic-axle load.

关 键 词：桥梁工程 移动车载识别 梁格法 车桥耦合 

分 类 号：U441.2[建筑科学—桥梁与隧道工程]