大轴重重载列车条件下既有铁路应急抢修钢梁的适应性研究

发布时间：2018-03-20 06:11

本文选题：重载运输　切入点：抢修钢梁　出处：《石家庄铁道大学》2015年硕士论文　论文类型：学位论文

【摘要】：重载运输是世界铁路发展的主要方向之一,我国铁路重载运输的发展既充分借鉴了国外铁路重载运输的先进经验,又注重结合国情路情实现自主创新,经过几年的努力,在实践中取得了十分显著的成效。重载铁路运输的快速发展提高了铁路的运输能力和经济效益,但列车轴重提高和编组增加给既有铁路桥梁的抢修带来了严重的影响。目前,储备的抢修钢梁大都是几十年前研制的,其能承受的荷载大小是根据当时的需求和科技发展水平确定的,因此,这样的抢修钢梁用于重载桥梁抢修,可能会出现抢修钢梁承载能力不足等问题。为保障铁路高效安全的运行,并最大程度的发挥既有抢修钢梁的潜力,对既有抢修钢梁按照现行新的规范和大轴重重载运输工况进行重新计算,并对结果进行分析研究。分析既有拆装式桁梁在现行的中-活载以及不同轴重的ZH活载作用下的受力特性,为其安全用于当前既有铁路桥梁和重载铁路桥梁的抢修提供技术支持,为我国重载铁路的发展提供应急保障。本文依据《铁路桥梁抢修通用图集》,以抢修钢梁-拆装式桁梁为研究对象,运用ANSYS软件对桁梁有待解决的问题进行深入的探究:首先,基于有限元理论和拆装梁的特点,利用大型有限元计算软件ANSYS提供的参数化语言APDL,建立了科学、较为精确的不同跨度及结构形式的拆装式桁梁参数化模型,然后依据拆装式桁梁的原设计荷载、中-活载以及不同轴重的ZH活载的荷载图式,给桁梁施加载荷,在ANSYS软件中对桁梁进行结构的强度、刚度、稳定性以及模态的分析,并对得出的结果依据《铁路桥梁抢修(建)技术规程》进行校核。另外,通过计算拆装式桁梁的内力,分析得出每一种跨度拆装梁的薄弱部位,以及不同跨度和结构形式的拆装梁的受力差异,得出不同跨度、不同拼组形式的拆装梁结构受力性能的变化规律,为将来用于重载铁路桥梁的抢修工程提供技术支撑。
[Abstract]:Heavy haul transportation is one of the main directions of railway development in the world. The development of heavy haul railway transportation in our country not only draws lessons from the advanced experience of foreign railway heavy haul transportation, but also pays attention to realizing independent innovation according to the national conditions. The rapid development of heavy haul railway transportation has improved the transportation capacity and economic benefit of railway, but the increase of axle load and formation of trains has brought serious influence to the urgent repair of existing railway bridges. Most of the steel beams in stock were developed decades ago, and the amount of load they can withstand is determined according to the demand at that time and the level of development of science and technology. Therefore, such urgent repair steel beams are used for emergency repair of heavy-haul bridges. In order to ensure the efficient and safe operation of the railway, and to maximize the potential of repairing the existing steel beams, According to the current new code and heavy load transportation conditions of heavy axle load, the existing rapid-repair steel beams are recalculated. The results are analyzed and studied. The mechanical characteristics of the existing disassembled truss beams under the current mid-live load and ZH live load with different axle loads are analyzed. To provide technical support for emergency repair of existing railway bridges and heavy haul railway bridges, This paper, based on the General Atlas of Railway Bridge repair, takes the steel beam-disassembly truss beam as the research object, and makes a deep research on the problems to be solved by using ANSYS software: first of all, Based on the finite element theory and the characteristics of disassembling and assembling beams, a scientific and accurate parametric model of disassembly truss beams with different span and structure form is established by using the parameterized language provided by the large finite element calculation software ANSYS. Then according to the original design load of the disassembled truss, the load schema of the mid-live load and the ZH live load of different axle load, the load is applied to the truss beam, and the strength, stiffness, stability and mode of the truss beam are analyzed in the ANSYS software. In addition, by calculating the internal forces of the disassembled truss beams, the weak parts of each span are obtained by calculating the internal forces of the disassembled truss beams, and the results obtained are based on the Technical regulations for the urgent repair (Construction) of Railway Bridges. And the stress difference of disassembling and assembling beam with different span and structure form is obtained, and the change rule of mechanical performance of disassembling and assembling beam structure with different span and different assembling form is obtained, which will provide technical support for the urgent repair project of heavy haul railway bridge in the future.
【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】：2015
【分类号】：U216;U445.7

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