基于可靠性分析的桥梁超限车通过权判别研究

发布时间：2018-12-10 14:09

【摘要】：超限运输对国民经济的发展至关重要，但是超限车辆会对沿线的桥梁造成结构损伤，影响货物的正常运营，大大降低桥梁的安全使用寿命。目前我国路政管理部门审批超限车辆的方法一般是费时费力的结构内力分析和基于经验的人工简单判别，这两种方法的审批效率都较低。因此，建立一个安全、可靠、简单、实用的判别准则，快速判别超限车辆的通过权意义重大。本文主要从以下三个方面做了相关的研究工作：（1）基于概率统计理论，建立了广西自治区典型五轴、六轴超限车辆荷载概率模型，，主要包括总重的双峰正态分布模型、总重和轴重的线性回归模型以及轴距L3的对数正态分布模型等，通过蒙特卡洛法随机生成超限车辆，建立了超限车辆荷载数据库；（2）详细介绍了可靠指标法判别超限车辆通过权的计算原理，通过对比分析荷载效应比较法、等效分布荷载法和可靠指标法等三种算法判别超限车辆通过权的计算结果，验证了按照本文采用的可靠指标法判别超限车通过权的可行性；（3）基于可靠指标法建立了广西自治区五轴、六轴超限车辆通行简支板桥和简支T梁桥的限载准则，给出了超限车辆在各荷载等级下的最大容许载重限值表以及包络线准则法判别超限车辆的通过权，并通过对比分析限载准则与可靠指标法判别实际超限车辆通过权的结果，验证了按照本文规定的限载准则判别超限车辆通过权的可行性。
[Abstract]:The over-limit transportation is very important to the development of national economy, but the over-limited vehicles will cause structural damage to the bridges along the route, affect the normal operation of the goods, and greatly reduce the safe service life of the bridges. At present, the methods of examining and approving overrun vehicles by highway administration departments in our country are usually time-consuming and laborious structural internal force analysis and simple manual discrimination based on experience, both of which have low approval efficiency. Therefore, it is of great significance to establish a safe, reliable, simple and practical criterion to quickly distinguish the passing weight of overrun vehicles. Based on the theory of probability and statistics, the paper establishes a typical five-axis and six-axis vehicle load probability model in Guangxi Autonomous region, which is related to the following three aspects: (1) based on the theory of probability and statistics, a typical five-axis and six-axis vehicle load probability model is established. It mainly includes the bimodal normal distribution model of gross weight, the linear regression model of gross weight and axle weight, and the logarithmic normal distribution model of wheelbase L3, etc. (2) the calculation principle of the reliability index method is introduced in detail, and the load effect comparison method is compared and analyzed. The calculation results of three algorithms, equivalent distributed load method and reliability index method, to distinguish the passing weight of overrun vehicles are proved to be feasible according to the reliability index method used in this paper. (3) based on the reliability index method, the loading limit criteria for simply supported plate bridges and simply supported T-beam bridges for five-axis and six-axis overrun vehicles in Guangxi Autonomous region are established. In this paper, the maximum allowable load limit table of overrun vehicles under each load grade and the envelope criterion method are given to judge the passing weight of overrun vehicles, and the results of comparing and analyzing the load limit criterion and the reliability index method to judge the passing weight of the actual overrun vehicles are given. The feasibility of judging the passing weight of overrun vehicle according to the limit criterion of this paper is verified.
【学位授予单位】：湖南大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：U446

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