重载交通公路桥梁设计荷载标准研究

发布时间：2018-04-06 03:14

本文选题：重载交通　切入点：车辆荷载谱　出处：《河北工业大学》2015年硕士论文

【摘要】：随着交通运输的不断发展,公路桥梁上的车辆荷载类型发生了巨大变化,重载化趋势非常明显。重载车辆的频繁出现会对桥梁产生损伤,危及安全。通过调查分析重载车辆荷载的特性和规律,不仅可以为量化分析重载交通对于桥梁结构的疲劳损伤影响提供技术参数,还可以为设计单位和桥梁运营管理部门提供参考依据,具有很大的现实意义和科研价值。本文通过对河北省高速公路在役重点桥梁进行交通荷载监测与调查,得到了基于实际的运行车辆荷载相关资料并进行了分析。主要内容有:1.根据轴数把主要运行车辆划分为五种,并分别统计研究了每种车型的车型特点、车重、轴重分布、车流量变化、车间距分布、重载超载率等规律。2.运用多峰分布和对数正态分布对车重和车间距进行了概率分布拟合,并依据疲劳等效的原则对实际调查的车辆荷载进行同轴合并、加权平均,计算得到了适用于我省的典型车辆荷载谱,并规定了标准疲劳车的形式。3.计算我国规范公路—I级荷载和英、美等国家规范的汽车活载效应并进行了比较,得出我国规范公路—I级荷载所产生的跨中最大弯矩效应为美国规范的0.84倍,为英国规范的0.80倍,汽车规范荷载标准值总体偏小。4.借助Matlab编程语言,利用蒙特卡洛数值模拟方法模拟产生了随机车流量模型,加载在跨径不同的简支梁桥和连续梁桥上计算弯矩效应。对比后发现实际车辆荷载的效应要比规范公路—I级大。提出了荷载提高系数:当跨径小于20m时,桥梁设计采用规范标准值的1.2倍;当跨径大于20m时,桥梁设计采用规范标准值的1.3倍。
[Abstract]:With the development of traffic and transportation, the type of vehicle load on highway bridge has changed greatly, and the trend of heavy load is very obvious.The frequent appearance of heavy-haul vehicles will damage the bridge and endanger the safety.Through investigation and analysis of the characteristics and rules of heavy duty vehicle load, it can not only provide technical parameters for quantitative analysis of fatigue damage effect of heavy haul traffic on bridge structure, but also provide reference basis for design unit and bridge operation management department.It has great practical significance and scientific research value.In this paper, traffic load monitoring and investigation of key bridges in service on highway in Hebei Province are carried out, and relevant data of running vehicle load are obtained and analyzed based on actual operation.The main content is: 1.According to the number of shafts, the main running vehicles are divided into five kinds, and the characteristics of each type of vehicle, the distribution of vehicle weight, the distribution of axle load, the variation of vehicle flow, the distribution of vehicle spacing and the overloading rate of heavy load are studied respectively.The multi-peak distribution and logarithmic normal distribution are used to fit the probability distribution of vehicle weight and vehicle spacing, and the coaxial combination and weighted average of the actual investigated vehicle loads are carried out according to the principle of fatigue equivalence.The load spectrum of typical vehicles suitable for our province is obtained and the form of standard fatigue vehicle. 3.In this paper, we calculate and compare the motor vehicle living-load effects of the code of highway class I of our country and the codes of Britain and America, and get that the maximum moment effect in span caused by the class I load of highway in our country is 0.84 times that of the code of the United States.It is 0.80 times that of the British code, and the standard value of the automobile code is generally small. 4.With the help of Matlab programming language, the stochastic traffic flow model is generated by Monte Carlo numerical simulation method, and the moment effect is calculated on simply supported and continuous beam bridges with different spans.After comparison, it is found that the effect of actual vehicle load is greater than that of highway class I.The load increasing coefficient is put forward: when the span is less than 20m, the design of the bridge is 1.2 times of the standard value of the code, and when the span is larger than 20m, the design of the bridge adopts 1.3 times of the standard value of the code.
【学位授予单位】：河北工业大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2

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