车辆荷载变异对桥梁可靠度影响及检测荷载标准改进的研究

发布时间：2018-04-22 22:12

本文选题：运营车辆荷载 + GPD分布　；参考：《广州大学》2017年硕士论文

【摘要】：随着我国工业化和城市化进程的不断地推进,公路运营车辆荷载整体上发生了较大的变异,车辆超载问题日益严重,不少桥梁结构实际寿命远低于设计寿命,导致既有桥梁的可靠度、运营车辆荷载变异问题逐渐成为当前研究的热点。为此,本文基于京珠、渝湛和粤赣三条高速公路所获得实测货车荷载数据,重现了三条高速公路的货车车流,得出其荷载效应极值,并基于GPD分布分析了既有桥梁的可靠度,提出了公路桥梁的检测评估荷载取值改进公式。本文研究工作主要包括以下四个方面:首先,利用动态称重系统WIM(Weight In Motion)获取的三百多万辆货车荷载数据进行统计分析。对统计车辆数据分别按总重、轴重、轴距分类统计,并对三条高速公路的货车荷载的情况进行统计分析,描述了其荷载特征,反映了各条高速公路当前运营货车荷载现状。其次,基于三条高速的货车荷载数据,采用蒙特卡罗法模拟随机货车车流,加载于简支梁上计算其荷载效应,采用阈值模型、极大似然估计理论、结合极值理论和超越概率理论,构建了三条高速公路的货车荷载效应在不同剩余服役期下的最大值分布函数并外其荷载效应极值,分析不同高速公路的荷载效应差异状况。再次,通过桥梁检测手段获得在役桥梁的承载能力,结合车辆荷载效应极值分布从而得出在服役桥梁结构的功能函数,使用蒙特卡洛法进行计算既有桥梁功能函数失效概率并考虑车辆荷载冲击力的对既有桥梁可靠度的影响,得出桥梁结构当前的可靠度以及车辆荷载差异、发展变异对桥梁未来的可靠度影响。最后,根据上述计算结果,提出基于标准设计荷载的公路桥梁检测评估荷载取值改进公式,并通过可靠度验算证明了该检测评估荷载的实用性和可行性。
[Abstract]:With the development of industrialization and urbanization in our country, the vehicle load of highway operation has changed greatly, the problem of vehicle overload is becoming more and more serious, and the actual life of many bridges is far lower than the design life. As a result of the reliability of existing bridges, the problem of load variation of operational vehicles has gradually become the focus of current research. Therefore, based on the measured load data obtained from Beijing-Zhujiang, Yuzhan and Guangdong-Jiangxi expressways, the freight car flow of the three expressways is reproduced, the extreme value of load effect is obtained, and the reliability of existing bridges is analyzed based on the GPD distribution. An improved formula for load selection of highway bridges is presented. The research work of this paper mainly includes the following four aspects: firstly, more than 3 million truck load data obtained from dynamic weighing system WIM(Weight in motion are statistically analyzed. The statistical data of vehicles are classified according to gross weight, axle load and wheelbase, and the load of freight cars on three highways is statistically analyzed, and the load characteristics are described, which reflect the current load situation of freight cars in operation on each highway. Secondly, based on the load data of three high-speed freight cars, the Monte Carlo method is used to simulate the random freight car flow, and the load effect is calculated by loading on simply supported beams. The threshold model is adopted and the maximum likelihood estimation theory is used. Combined with extreme value theory and transcendental probability theory, the maximum distribution function of freight car load effect under different remaining service periods was constructed and its load effect extreme value was analyzed. Thirdly, the bearing capacity of in-service bridges is obtained by means of bridge detection, and the function function of the bridge structure in service is obtained by combining with the extreme value distribution of vehicle load effect. Using Monte Carlo method to calculate the failure probability of existing bridge function and considering the influence of vehicle load impact force on existing bridge reliability, the current reliability of bridge structure and the difference of vehicle load are obtained. The influence of development variation on the future reliability of bridges. Finally, according to the above calculation results, an improved formula of load selection for highway bridges based on standard design load is proposed, and the practicability and feasibility of the test and evaluation load are proved by reliability checking calculation.
【学位授予单位】：广州大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.2

【参考文献】