基于Matlab软件的沥青路面结构可靠度程序设计及其应用研究

发布时间：2018-11-02 19:08

【摘要】：我国目前沥青路面设计方法为定值型设计方法,采用这种方法设计出的沥青路面结构与实际工作状态存在很大差异。所以,为了使设计结果更接近于实际情况,在设计中要考虑设计参数的随机性,将可靠性的理论引入到沥青路面结构设计中。考虑沥青路面结构设计中交通参数(累计当量轴次)、几何参数(各结构层厚度)、结构参数(各结构层抗压模量、各结构层抗弯拉模量、各结构层劈裂强度)的随机性,采用蒙特卡罗法,利用Matlab软件设计编写了沥青路面结构可靠度计算的通用程序。该程序可供10层以内任意层数的沥青路面结构,进行以弯沉及以弯拉应力为控制指标的可靠度计算。程序可以方便地实现数据输入、输出与存储功能,操作简便,计算精度良好,可供设计者在路面结构组合设计后对设计方案进行可靠度计算。为了利用自编可靠度程序分析结构可靠度对各个随机参数的敏感度大小,并且有针对性地调整设计方案,在可靠度计算程序的基础上进行改进,编写了可靠度对交通参数、几何参数、结构参数的均值及变异系数敏感度分析的程序。利用该程序可得到随机参数的不同均值或不同变异系数水平下对应的可靠度,并可以绘制关系图线。计算结果与图形都可以方便地进行存储、查阅。最后对所编各个程序进行编号,汇总成总程序,使其通过识别程序编号执行对应程序的功能,更加方便使用者操作。最后,选取算例利用自编程序进行了沥青路面结构可靠度计算,验证了自编程序的正确性。并进行了可靠度对交通参数、几何参数、结构参数的均值及变异系数的敏感度分析,找出了三类参数中对可靠度影响程度较为显著的因素。对随机参数均值及变异系数同可靠度间关系进行了拟合,给出了拟合方程。
[Abstract]:The design method of asphalt pavement in China is a fixed value design method. The structure of asphalt pavement designed by this method is very different from the actual working state. Therefore, in order to make the design results closer to the actual situation, the randomness of design parameters should be considered in the design, and the reliability theory should be introduced into the design of asphalt pavement structure. Considering the randomness of traffic parameters (accumulative equivalent axis), geometric parameters (thickness of each structure layer), structural parameters (compressive modulus of each structure layer, flexural tensile modulus of each structural layer, splitting strength of each structural layer) in the structural design of asphalt pavement. A general program for calculating the structural reliability of asphalt pavement is designed by using Monte Carlo method and Matlab software. The program can be used to calculate the reliability of asphalt pavement structure with any number of layers within 10 layers, which is controlled by deflection and flexural stress. The program can easily realize the functions of data input, output and storage. It is easy to operate and has good calculation precision. It can be used to calculate the reliability of the design scheme after the design of pavement structure combination. In order to analyze the sensitivity of structural reliability to each random parameter by using self-compiled reliability program, and adjust the design scheme pertinently, the reliability calculation program is improved, and the reliability to traffic parameter is compiled. Geometric parameters, structural parameters of the mean and coefficient of variation sensitivity analysis program. By using this program, the reliability of random parameters with different mean value or variation coefficient can be obtained, and the relationship line can be drawn. Calculation results and graphics can be conveniently stored and consulted. Finally, each program is numbered and summarized into a master program, so that it can perform the function of the corresponding program by identifying the program number, which is more convenient for the user to operate. Finally, an example is selected to calculate the structural reliability of asphalt pavement, which verifies the correctness of the program. The sensitivity of reliability to traffic parameters, geometric parameters, the mean value of structural parameters and the coefficient of variation is analyzed, and the factors that influence the reliability of the three kinds of parameters are found out. The relationship between random parameter mean and coefficient of variation and reliability is fitted, and the fitting equation is given.
【学位授予单位】：内蒙古工业大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U416.217

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