钢管混凝土系杆拱桥复合式吊杆疲劳性能研究

发布时间：2018-01-19 20:26

本文关键词： 钢管混凝土系杆拱桥复合式吊杆车辆荷载随机车流疲劳性能　出处：《长安大学》2015年硕士论文　论文类型：学位论文

【摘要】：本文通过对公路桥梁车辆荷载调查与统计方法的归纳分析,基于蒙特卡罗法构建了数值模拟形式的疲劳荷载谱,采用不同的疲劳荷载谱对钢管混凝土系杆拱桥吊杆的疲劳性能研究,并结合实桥工程复合式吊杆的构造特征,分析成品索和钢套管吊杆的应力幅变化规律以及相应的疲劳特性,为复合式吊杆的设计与使用维护提供技术指导。主要研究内容如下:(1)基于对数理统计基本理论的归纳分析,明确对车辆荷载调查数据的统计方法;在对疲劳概念、疲劳分类、疲劳破坏机理与疲劳荷载模型、疲劳分析理论等归纳分析的基础上,推荐传统疲劳分析法作为实桥工程复合式吊杆疲劳性能研究的基本方法,为本文的研究提供理论指导。(2)基于数理统计的基本理论,对借用的车辆荷载调查数据统计分析,确定疲劳车辆荷载相关要素(车流量、车重、车间距、轴重与轴距分配比例)的分布类型与统计参数。基于蒙特卡罗法的基本思想,生成一般运行状态下随机车流形式的车辆疲劳荷载谱,为公路钢桥抗疲劳设计分析提供荷载模式。(3)采用MATLAB软件编制基于蒙特卡罗法的随机车流模拟程序、基于随机车流影响线加载的应力历程计算程序和基于雨流计数法的应力幅统计程序,为复合式吊杆疲劳性能的分析与计算提供技术支持。(4)以实桥工程为依托,选取车辆疲劳荷载谱形成随机车流,对典型吊杆的应力影响线加载,计算得到成品索和钢套管吊杆的应力幅概率分布;基于线性疲劳累积损伤理论,通过推荐成品索和钢套管吊杆的疲劳强度S-N曲线,计算了典型吊杆的疲劳累积损伤度,探讨了钢管混凝土系杆拱桥复合式吊杆的疲劳破坏规律。
[Abstract]:In this paper, the fatigue load spectrum in the form of numerical simulation is constructed based on Monte Carlo method through the induction and analysis of vehicle load investigation and statistical method of highway bridge. The fatigue behavior of suspension rod of concrete-filled steel tubular tied arch bridge is studied by using different fatigue load spectrum, and combined with the structural characteristics of composite suspension rod in real bridge engineering. The variation law of stress amplitude and the corresponding fatigue characteristics of finished cable and steel casing boom are analyzed. The main research contents are as follows: (1) based on the induction and analysis of the basic theory of mathematical statistics, the statistical method of vehicle load survey data is clear; Based on the analysis of fatigue concept, fatigue classification, fatigue failure mechanism and fatigue load model, fatigue analysis theory and so on. The traditional fatigue analysis method is recommended as the basic method to study the fatigue performance of composite suspenders in real bridge engineering, which provides theoretical guidance for the research of this paper. (2) the basic theory based on mathematical statistics. Based on the statistical analysis of borrowed vehicle load data, the relevant factors of fatigue vehicle load (vehicle flow, vehicle weight, vehicle spacing) are determined. Based on the basic idea of Monte Carlo method, the vehicle fatigue load spectrum in the form of random vehicle flow in general running state is generated. Provide load mode for fatigue design analysis of highway steel bridge. Use MATLAB software to compile the simulation program of random traffic flow based on Monte Carlo method. The calculation program of stress history based on random train flow influence line and the statistical program of stress amplitude based on rain flow counting method. Provide technical support for the analysis and calculation of the fatigue performance of composite suspenders. Based on the real bridge engineering, select the fatigue load spectrum of vehicles to form random traffic flow, and load the stress influence line of typical suspenders. The probability distribution of stress amplitude of the finished cable and steel casing boom is calculated. Based on the theory of linear fatigue cumulative damage, the fatigue cumulative damage degree of typical suspension rod is calculated by recommending S-N curve of fatigue strength of finished cable and steel casing boom. The fatigue failure law of composite suspenders of concrete-filled steel tubular tied arch bridge is discussed.
【学位授予单位】：长安大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.4;U448.225

【共引文献】