并道运行状态下高速公路桥梁车辆荷载效应

发布时间：2018-03-06 04:03

本文选题：桥梁工程　切入点：车辆荷载效应　出处：《长安大学学报(自然科学版)》2017年01期 　论文类型：期刊论文

【摘要】：为得到并道运行状态下车辆荷载对桥梁结构的作用效应,利用1座连续梁桥的实测车辆荷载数据,研究了并道运行状态下高速公路桥梁的车辆荷载效应分析方法。首先,根据车辆并道的特点,通过EM算法得到了车重、轴重、轴间距和车间距等参数的分布特征;然后,针对并道运行状态下车间距减小和拥堵的2种情况,提出了相应随机车辆荷载流的模拟方法;最后,结合随机车辆荷载影响线和极值分布理论,计算得到了并道运行状态桥梁车辆荷载效应的评估值,并分析了车间距对车辆荷载效应的影响规律。研究结果表明:并道运行状态下车重、轴重、轴间距服从混合Gauss分布,车间距服从对数正态分布;针对并道运行状态随机车辆荷载的模拟方法可以较好地分析该状态下高速公路桥梁的车辆荷载效应,其中车辆并道状态下所研究桥梁的荷载效应评估值分别为汽车超-20、公路Ⅰ级的1.13、1.03倍;当车辆并道且发生拥堵的最不利状态时,荷载效应分别为设计荷载汽车超-20、公路Ⅰ级的1.29、1.17倍;车辆并道受车间距的影响较大,车间距在2~5m时车辆间距内的效应值与车辆间距的大小基本呈线性关系,当车辆间距控制在10m以上时,可确保该桥实际车辆荷载效应小于设计荷载效应。研究结果可为并道运行状态桥梁承载能力评估和并道运行的交通布控提供参考。
[Abstract]:In order to obtain the effect of vehicle load on bridge structure under the condition of parallel road running, using the measured vehicle load data of a continuous beam bridge, this paper studies the vehicle load effect analysis method of expressway bridge under the running state of parallel road. According to the characteristics of vehicle running, the distribution characteristics of vehicle weight, axle load, axle spacing and vehicle spacing are obtained by EM algorithm. The simulation method of the load flow of the corresponding random vehicle is put forward. Finally, combined with the theory of the influence line of the random vehicle load and the theory of the extreme value distribution, the evaluation value of the vehicle load effect of the bridge in the running state of the parallel road is obtained. The influence of vehicle spacing on vehicle load effect is analyzed. The results show that the load, axle load and axle-spacing clothing are distributed from mixed Gauss, and the distance clothing from logarithmic normal distribution. According to the simulation method of random vehicle load in the running state of parallel road, the vehicle load effect of highway bridge under this condition can be well analyzed. The evaluation values of load effect of the bridges studied under the condition of vehicle and road are respectively 1.13 ~ 1.03 times of that of class I of highway, respectively, when the vehicle is in the same road and the most unfavorable condition of congestion occurs, and the load effect of the bridge is estimated to be 1.13 times of that of the first class of highway. The load effect is 1.291.17 times that of the first grade of highway, and the effect value of vehicle spacing is linear when the distance between vehicles is 2 ~ 5 m, and the load effect is 1.291.17 times of the first grade of highway, respectively, when the vehicle spacing is 2 ~ 5 m, the effect value of vehicle spacing is linear to the size of vehicle spacing. When the vehicle spacing is more than 10 m, the actual vehicle load effect of the bridge is less than that of the design load effect. The results of the study can provide a reference for the evaluation of the bearing capacity of the bridge in the running state of the parallel road and the traffic layout control for the running of the parallel road.
【作者单位】：福州大学土木工程学院;福建省建筑科学研究院;东南大学土木工程学院;
【基金】：国家自然科学基金项目(51178101) 福建省交通科技重点项目(201104)
【分类号】：U441.2

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