铁路中等跨度抢修钢梁疲劳性能研究

发布时间：2018-04-04 07:42

本文选题：抢修钢梁　切入点：疲劳分析　出处：《石家庄铁道大学》2017年硕士论文

【摘要】：我国铁路钢梁疲劳性能的研究发展缓慢,设计规范比较陈旧。针对应急抢修钢梁疲劳问题的特点更是认知不足,技术水平在诸多方面都无法满足我国抢修钢桥的要求。近年来,由于我国抢修钢梁结构简单、装拆迅速、随机搭配、反复使用和一物多用等特性,而被广泛应用。但由于缺少相关规范的科学指导,造成对抢修钢梁的疲劳寿命认识不足,使得实际使用中易发生疲劳破坏。故十分有必要开展对应急抢修钢梁疲劳寿命评估和抗疲劳设计方面的研究。本文依据《钢结构设计规范》、《铁路桥梁抢修(建)技术规程》及概率论等相关知识,以铁路中等跨度抢修钢梁为研究对象,运用ANSYS等辅助软件对该钢梁的疲劳性能进行深入的探究:首先,针对我国铁路应急抢修钢梁现行规范中关于抢修钢梁抗疲劳设计方面的不足之处,在归纳总结现有的抗疲劳设计方法的基础上,结合抢修钢梁使用特点提出了一种可供我国铁路应急抢修钢梁抗疲劳设计的简易方法。其次,针对抢修钢梁重要部位的各个受力杆件,分别以东风4型机车和C60型敞车两种荷载形式引发的应力幅对其进行疲劳分析,探求其疲劳寿命。并通过对上述两种荷载状态下疲劳寿命对比分析研究,明确了5节敞车与单机机车对应的疲劳寿命相同。最后,针对抢修钢梁同类杆件在拼组过程中可随机互换使用、重复应用的特性,应用名义应力法和概率理论等方法,探求出任意随挂敞车数量下的杆件及整体抢修钢梁的疲劳寿命计算方法,并进行了单机随挂60节C60型敞车时,杆件及整体抢修钢梁的疲劳寿命评估。
[Abstract]:The research on fatigue properties of railway steel beams in China is slow and the design code is old.In view of the characteristics of emergency repair of steel beam fatigue problem is not enough, the technical level in many aspects can not meet the requirements of the repair of steel bridges in China.In recent years, steel beams in China have been widely used because of their simple structure, rapid assembly and disassembly, random collocation, repeated use and multi-purpose.However, due to the lack of scientific guidance of the relevant codes, the fatigue life of the steel beam repaired by rush repair is not well understood, and fatigue damage is easy to occur in practical use.So it is necessary to study the fatigue life evaluation and anti-fatigue design of emergency repair steel beam.Based on the relevant knowledge of Code for Design of Steel structures, Technical Specification for Emergency repair (Construction) of Railway Bridges and probability Theory, this paper takes steel beams with medium span as the research object.The fatigue performance of the steel beam is studied by using ANSYS and other auxiliary software. Firstly, aiming at the deficiency of the fatigue design of emergency repair steel beam in the current code of railway emergency repair in our country.On the basis of summing up the existing anti-fatigue design methods, a simple method of anti-fatigue design for railway emergency repair steel beams in China is put forward according to the characteristics of emergency repair steel beams.Secondly, the fatigue life of the steel beam is analyzed by using the stress amplitude caused by the two kinds of load forms of DF _ 4 locomotive and C _ 60 type open truck, aiming at the various bearing members in the important parts of the steel beam.By comparing and analyzing the fatigue life of the above two kinds of loads, it is clear that the fatigue life corresponding to the five-section open car is the same as that of the single locomotive.Finally, aiming at the characteristics of random interchangeable and repeated application of similar steel beam members in assembling process, the nominal stress method and probability theory are applied.In this paper, the fatigue life calculation method of bar and integral repair steel beam with arbitrary number of hoist trucks is obtained, and the fatigue life evaluation of bar and integral repair steel beam is carried out when 60 sections of C60 type open car are hung on a single machine.
【学位授予单位】：石家庄铁道大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U441.4

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