基于人车路相互作用的路桥接合处差异沉降控制标准

针对路基和桥梁沉降量不同而造成路桥接合处出现桥头跳车的现象,为确定桥头跳车的定量指标,选取人体加权加速度均方根值作为桥头车辆行驶舒适性的振动指标。将路桥接合处纵断面沉降曲线拟合为指数型曲线之后,建立了路桥接合处路面不平整时域模型,并分析了桥头车辆行驶舒适性的影响因素。分析结果显示车速、路桥过渡段的最大差异沉降量和沉降区段长度对人体的行驶舒适性影响很大。根据分析结果,确定了基于人车路相互作用的路桥接合处差异沉降控制参考标准。研究结果可作为判断桥头是否跳车的依据,也可用于一般路基差异沉降标准的制定。

Differential Settlement Control Criteria of Bridge-approach Junction Based on People-vehicle-road Interaction

The different settlements between the head of the bridge and subbed create the pavement roughness.The value of the roughness which is called the bump at bridge-head influences the comfort of users.For getting the quota data of the bump at bridge-head,the human weighed acceleration root mean square(RMS)was chosen as the evaluation index of ride comfort when the vehicle was passing through bridge-head.Road unevenness time-domain model of bridge-approach junction was build up according to exponential curve which fits vertical section settlement curve.Differential settlement control criteria was set up after studying the factors which affect ride comfort greatly, including velocity,maximum differential settlement between bridge and subbed,and subbed settlement length.The study can be used not only as a rule for estimating weather or not the bump at bridge-head occurred,but also as a reference for control criteria of differential settlement on common subbed.