超重货物装载偏心条件下桥梁活荷载计算方法研究

发布时间：2018-02-02 16:56

本文关键词： 铁路运输超重货物货物装载　出处：《西南交通大学》2015年硕士论文　论文类型：学位论文

【摘要】：超重货物这个概念在我国铁路货物运输中出现时间较短,很多铁路货运工作人员对其理解不准确,也没有健全的超重货物运输管理规定,基本理论方面的研究也很少。这就给超重货物运输组织带来很大困难,也导致铁路大件货物运输在市场份额逐年下降。本文先从超重货物概念作为切入点,深入分析超重货物的含义与特性。对铁路超重货物运输组织过程进行详细分析,然后阐述了我国铁路超重货物运输组织过程中存在的问题及原因。超重等级是反映货物超重程度的唯一指标,正确核定货物超重等级是超重货物运输组织顺利开展的保证。货物装载重心偏移会导致运输过程中车辆受力不均,就会给铁路桥梁施加很大活荷载作用,对桥梁产生一定的破坏。利用UG把货车经过桥梁的瞬间用三维模型展示出来,然后导入有限元分析软件ANSYS中,分析货物装载重心偏移和未偏移两种情况下的铁路桥梁受到的活荷载。得到货物装车后重车总重量不变的情况下,货物装载方案的不同,重车作用下的桥梁活荷载也不同。铁路桥梁活荷载是确定货物超重等级的重要依据。《超规》中提到的货物超重等级确定方法比较简单,未给出货物装载重心偏移情况下的超重等级计算方法。结合力学知识,通过理论推导,提出货物装载重心偏移情况下的超重等级计算方法,为修善《超规》提供理论基础。
[Abstract]:The concept of overweight goods appears in China's railway freight transport for a short time, many railway freight workers understand it inaccurately, and there is no sound management regulations for overweight cargo transportation. The research on basic theory is also very few, which brings great difficulties to the organization of overweight cargo transportation, and also leads to the decrease of market share of railway large cargo transportation year after year. This paper starts with the concept of overweight goods as a starting point. The meaning and characteristics of overweight goods are analyzed in depth. The organization process of railway overweight cargo transportation is analyzed in detail. Then the paper expounds the problems and reasons in the process of railway overweight freight transportation in China. The overweight grade is the only index to reflect the overweight degree of goods. The correct checking of the overweight grade of goods is the guarantee of the smooth development of the transportation organization of the overweight goods. The deviation of the center of gravity of the cargo loading will lead to the uneven force of the vehicle during the transportation process, which will exert a great effect of live load on the railway bridge. Using UG to display the freight car passing through the bridge with 3D model, and then introducing the finite element analysis software ANSYS. This paper analyzes the live load of railway bridge under the condition of the center of gravity deviation of cargo loading and the unoffset condition. It is obtained that the loading scheme is different when the total weight of heavy car remains unchanged after loading. The bridge living load under the action of heavy truck is also different. The railway bridge live load is an important basis for determining the overweight grade of goods. The method of determining the overweight grade of goods mentioned in the "overgauge" is relatively simple. The calculation method of overweight grade under the condition of gravity center deviation of cargo loading is not given. The calculation method of overweight grade under the condition of gravity center deviation of cargo loading is put forward through theoretical derivation of the knowledge of combining ability. To provide a theoretical basis for good practice.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：U441.2

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