摘要
采用美国密歇根科技公司(MSC)货车车轮六分力传感器,采集不同道路线形、车型、载重和路面类型货车轮胎荷载实车试验数据,结合车辆动力学理论进行了典型货车运动惯性荷载特性分析。分析结果显示:惯性运动荷载的量级主要取决车辆质量、质量分布、加速度大小和方向以及轮胎的组数和接地压强,道路线形起伏和平面转换会引起车辆加减速和复杂惯性运动模式。运动惯性荷载分为两类:第一类表现为较大的均匀荷载,另一类为冲击性荷载;在3个方向荷载中,垂向方向上数值最大,纵向和横向水平方向上数值较小,垂向冲击系数可达4以上,远高于目前一般采用的冲击系数值。引起较大运动惯性荷载的敏感位置,一般分布在车速变化和行驶方向变化显著的转弯路段和坡底路段。长时间持续冲击一般由弯道侧倾运动引起;短时冲击是由于在竖曲线上的车辆制动或加减速引起的俯仰运动以及摇摆运动造成。考虑货车的运动惯性荷载作用效应对于货车重载交通路面结构与材料合理设计、桥梁结构弯道设计和车辆管理均十分必要。
The wheel force transducer of Michigan technology company(MSC)was used to collect the field truck data of tire load with different highway alignment,vehicle type,load,and pavement types.Combined with the vehicle dynamics,the characteristics of typical truck motion inertia load were analyzed.The results show that the magnitude of inertial motion load mainly depends on the vehicle mass,distribution,acceleration size,direction,and the number of tire groups and pressure.Highway alignment fluctuation and horizontal conversion would cause vehicle acceleration,deceleration,and complex inertial motion mode.The motion inertia load is divided into two types,with the first type being the large uniform load and another being the impact load.In the three directions,the value in the vertical direction is the largest,while the values in the longitudinal and transverse horizontal directions are small.The vertical impact coefficient can exceed 4,which is much higher than the impact coefficient commonly adopted nowadays.Sensitive locations with larger motion inertia loads are generally distributed in the turning sections and the slope bottom sections with significant changes in speed and driving direction.Long lasting impact is generally caused by rolling motion;Short time impact is caused by pitching motion and rocking motion,which is indirectly caused by vehicle braking or acceleration and deceleration on the vertical curve.It is necessary to consider the effect of truck motion inertia load in the design of heavy pavement structures and materials,curve design of bridge structures,and vehicle management.
作者
胡昌斌
林淼
童生豪
HU Chang-bin;LIN Miao;TONG Sheng-hao(College of Civil Engineering,Fuzhou University,Fuzhou,Fujian 350108,China)
出处
《工程力学》
EI
CSCD
北大核心
2023年第8期243-256,共14页
Engineering Mechanics
基金
国家自然科学基金项目(51978172)。