重载铁路钢桁梁桥受力性能适应性分析
发布时间：2019-01-08 14:04
【摘要】：我国地域辽阔,物资运量大、运距远,经济的高速发展对铁路运输也提出了新的要求,在既有线上开行重载列车是一种低成本的可行方法,但势必会对既有铁路桥梁的安全性、疲劳寿命产生不利影响,因此,需对重载桥梁的受力性能进行分析。本文以中国铁路总公司科技研究开发计划重大课题《京广线既有钢桥适应大轴重重载运输的关键技术研究》(2013G010-A)为依托,以新菏长东黄河大桥4×108 m连续钢桁梁桥为研究对象,分别采用有限元软件Midas和ANSYS建立有限元模型,对重载列车作用下钢桁梁桥的整体受力性能、杆件受力性能和疲劳寿命进行了分析,主要研究内容和结论如下:(1)根据设计图纸,确定长东黄河大桥连续钢桁梁部分的杆件截面尺寸、边界条件、节点连接方式,建立Midas有限元模型并对其进行校核。(2)对重载列车作用下钢桁梁桥的整体受力适应性进行分析。采用Midas软件进行了静力性能分析,结果表明重载列车荷载作用下的竖向挠度和在摇摆力、风力作用下的横向挠度均满足现行规范要求。与中 活载下相比,竖向挠度安全裕度下降22%,横向挠度安全裕度基本不变;采用ANSYS软件进行了动力响应分析,结果表明重载列车作用引起的跨中竖向动挠度、横向振幅、竖向加速度和活动支座转角分别比中 活载作用下增大26.0%、32.0%、42.9%和26.8%。(3)对重载列车作用下钢桁梁桥的杆件受力适应性进行了分析,结果表明在中 活载作用下杆件应力、应力幅、稳定性均满足要求。在重载列车作用下杆件应力满足要求;跨中处下弦杆、支座处斜杆等杆件的应力幅不满足要求;跨中处上弦杆,支座处下弦杆、下平联杆件、斜杆等部分杆件稳定性不满足要求。(4)对重载列车作用下钢桁梁桥典型杆件的疲劳寿命进行了分析。根据动力分析中得到的典型杆件处的应力时程,采用雨流法对应力幅进行计数,得到累积损伤度,然后根据线性累积损伤原理分别对各典型杆件在重载列车和普通列车作用下的疲劳寿命进行了分析。总体来说,该桥在C96重载编组列车作用下典型杆件的疲劳寿命比普通列车作用下平均缩短80%左右。
[Abstract]:China has a vast territory, large quantity of goods and materials, long transportation distance, and the rapid development of economy has put forward new requirements for railway transportation. It is a feasible method of low cost to operate heavy haul trains on existing railway lines, but it is bound to be safe for existing railway bridges. Fatigue life has a negative effect, so it is necessary to analyze the mechanical behavior of heavy-load bridges. This paper is based on the important project of China Railway Corporation Science and Technology Research and Development Plan (2013G010-A), which is the key technology of existing steel bridges of Beijing-Guangzhou railway line to adapt to heavy load transportation of large axles. Taking the 4 脳 108m continuous steel truss bridge of Xinhe Changdong Yellow River Bridge as the research object, the finite element model was established by using the finite element software Midas and ANSYS, respectively, and the overall mechanical behavior of the steel truss bridge under the action of heavy load train was studied. The main research contents and conclusions are as follows: (1) according to the design drawings, the section size, boundary condition and connection mode of continuous steel truss beam of Changdong Yellow River Bridge are determined. The finite element model of Midas is established and checked. (2) the adaptability of steel truss bridge under the action of heavy-haul train is analyzed. The static performance analysis using Midas software shows that the vertical deflection under heavy load and the lateral deflection under the action of swaying force and wind force can meet the requirements of the current code. Compared with the live load, the vertical deflection safety margin is reduced by 22 and the lateral deflection safety margin is not changed. The dynamic response analysis is carried out by using ANSYS software. The results show that the vertical deflection, lateral amplitude, vertical acceleration and rotation angle of moving support caused by the action of heavy-haul train are 26.0% and 32.0% higher than those under the action of live load, respectively. 42.9% and 26.8. (3) the stress adaptability of steel truss girder bridge under the action of heavy-haul train is analyzed. The results show that the stress, stress amplitude and stability of steel truss bridge under the action of live load meet the requirements. Under the action of heavy-haul train, the stress of the rod can not meet the requirements, the stress amplitude of the lower chord at the middle span and the inclined rod at the support does not meet the requirements. The stability of the upper chord at the center of the span, the lower chord at the support, the lower flat link and the inclined bar are not satisfied with the requirements. (4) the fatigue life of the typical steel truss bridge members under the action of the heavy haul train is analyzed. According to the stress time history at the typical member in the dynamic analysis, the stress amplitude is counted by the rain flow method, and the cumulative damage degree is obtained. Then the fatigue life of typical bars under the action of heavy haul train and ordinary train is analyzed according to the principle of linear cumulative damage. As a whole, the fatigue life of the typical rod of the bridge under the action of C96 heavy haul marshalling train is about 80% shorter than that of the ordinary train.
【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】：U441
本文编号：2404703
[Abstract]:China has a vast territory, large quantity of goods and materials, long transportation distance, and the rapid development of economy has put forward new requirements for railway transportation. It is a feasible method of low cost to operate heavy haul trains on existing railway lines, but it is bound to be safe for existing railway bridges. Fatigue life has a negative effect, so it is necessary to analyze the mechanical behavior of heavy-load bridges. This paper is based on the important project of China Railway Corporation Science and Technology Research and Development Plan (2013G010-A), which is the key technology of existing steel bridges of Beijing-Guangzhou railway line to adapt to heavy load transportation of large axles. Taking the 4 脳 108m continuous steel truss bridge of Xinhe Changdong Yellow River Bridge as the research object, the finite element model was established by using the finite element software Midas and ANSYS, respectively, and the overall mechanical behavior of the steel truss bridge under the action of heavy load train was studied. The main research contents and conclusions are as follows: (1) according to the design drawings, the section size, boundary condition and connection mode of continuous steel truss beam of Changdong Yellow River Bridge are determined. The finite element model of Midas is established and checked. (2) the adaptability of steel truss bridge under the action of heavy-haul train is analyzed. The static performance analysis using Midas software shows that the vertical deflection under heavy load and the lateral deflection under the action of swaying force and wind force can meet the requirements of the current code. Compared with the live load, the vertical deflection safety margin is reduced by 22 and the lateral deflection safety margin is not changed. The dynamic response analysis is carried out by using ANSYS software. The results show that the vertical deflection, lateral amplitude, vertical acceleration and rotation angle of moving support caused by the action of heavy-haul train are 26.0% and 32.0% higher than those under the action of live load, respectively. 42.9% and 26.8. (3) the stress adaptability of steel truss girder bridge under the action of heavy-haul train is analyzed. The results show that the stress, stress amplitude and stability of steel truss bridge under the action of live load meet the requirements. Under the action of heavy-haul train, the stress of the rod can not meet the requirements, the stress amplitude of the lower chord at the middle span and the inclined rod at the support does not meet the requirements. The stability of the upper chord at the center of the span, the lower chord at the support, the lower flat link and the inclined bar are not satisfied with the requirements. (4) the fatigue life of the typical steel truss bridge members under the action of the heavy haul train is analyzed. According to the stress time history at the typical member in the dynamic analysis, the stress amplitude is counted by the rain flow method, and the cumulative damage degree is obtained. Then the fatigue life of typical bars under the action of heavy haul train and ordinary train is analyzed according to the principle of linear cumulative damage. As a whole, the fatigue life of the typical rod of the bridge under the action of C96 heavy haul marshalling train is about 80% shorter than that of the ordinary train.
【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】：U441
【参考文献】
相关期刊论文 前1条
1 阎楚良,卓宁生,高镇同;雨流法实时计数模型[J];北京航空航天大学学报;1998年05期
，本文编号：2404703
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