八七型铁路应急抢修钢梁用于重载铁路桥梁抢修的力学性能研究

发布时间：2019-06-15 09:58

【摘要】：八七型铁路应急抢修钢梁(简称八七梁)是目前我国适应跨度最大的抢修钢梁,具有结构简单,组装方便,拼架速度快,使用面广等特点,满足战时铁路保障与平时抢险救灾应急使用的要求。随着社会和国家经济不断发展变化,铁路运输在提高列车速度以加快货物周转的同时,也要求大幅度提高列车的载货重量。国内外铁路重载运输经验表明,通过对线桥设备进行合理的强化改造,实现在既有铁路开行大轴重货物列车,是提高运输能力与效率的最佳途径,这必然会出现在重载列车活载作用下八七梁的适应性问题。基于上述情况,本文开展了如下工作:(1)介绍了八七梁的技术条件和特点、结构部件、桥跨结构型式。(2)利用有限元软件ANSYS建立了不同桥跨型式不同跨度八七梁有限元模型,对其进行了动力特性分析。(3)在建立的有限元模型上分别按原设计活载(前进型机车单机随挂7 t/m匀载)、中—活载、不同轴重ZH标准活载(25 t轴重、27 t轴重及30 t轴重)等共五种列车活载图式,对结构的强度、刚度、稳定性进行了计算分析,并根据《铁路桥梁抢修(建)技术规程》(试行)对计算结果进行校核。(4)针对不同载荷状态下,不同跨度和结构形式的八七梁结构中不满足规范的情况,进行了使用方案的改进措施研究。通过本论文研究,分析比较了八七梁在不同列车活载图式作用下的力学性能变化规律,得出了相应活载下满足规范要求和不满足规范要求的八七梁适用情况,并经过对部分八七梁使用方案的改进,使之能够适应重载铁路桥梁抢修需要。研究结果提高了八七梁的适应性,可为将来八七梁用于重载铁路桥梁的抢修工程提供技术支撑。
[Abstract]:87 type railway emergency repair steel beam (abbreviated as 87 beam) is the largest emergency repair steel beam with the largest span in our country at present. It has the characteristics of simple structure, convenient assembly, fast framing speed and wide use, which meets the requirements of emergency use of railway support and emergency relief in peacetime. With the continuous development and change of society and national economy, railway transportation not only increases the train speed to speed up the cargo turnover, but also requires a large increase in the load of the train. The experience of railway heavy load transportation at home and abroad shows that it is the best way to improve the transportation capacity and efficiency by reasonably strengthening the line and bridge equipment to realize the operation of large axle load freight train in the existing railway, which will inevitably occur in the adaptability of 87 beams under the live load of heavy duty train. Based on the above situation, the following work has been carried out in this paper: (1) the technical conditions and characteristics of the eight seven beams, structural components and bridge span structure types are introduced. (2) the finite element models of different bridge span types and different span 87 beams are established by using the finite element software ANSYS, and their dynamic characteristics are analyzed. (3) on the established finite element model, the live load is designed according to the original design. Five kinds of train live load schemas, including 25 t axle load, 27 t shaft load and 30 t axle load, are calculated and analyzed, and the calculation results are checked according to the Technical Specification for Emergency repair (Construction) of Railway Bridges (trial). (4) according to the different load conditions, the eight seven beam structures with different span and structural form are not satisfied with the specification. (4) according to the technical specification for emergency repair (construction) of railway bridges (trial), the calculation results are checked according to the calculation results of five kinds of train live load schemas (25 t axle load, 27 t shaft load and 30 t axle load). The improvement measures of the use scheme are studied. Through the research of this paper, the change law of mechanical properties of 87 beams under the action of different train live load schemas is analyzed and compared, and the applicable conditions of 87 beams which meet the requirements of the code and do not meet the requirements of the code under the corresponding live load are obtained, and through the improvement of the use scheme of some 87 beams, it can meet the needs of emergency repair of heavy load railway bridges. The research results improve the adaptability of the 87 beam and provide technical support for the emergency repair project of the 87 beam used in the heavy load 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】：2017
【分类号】：U445.7;U441

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