列车撞击作用下高铁客站无柱张弦梁雨棚结构的倒塌破坏研究
发布时间：2018-12-30 22:16
【摘要】：进入21世纪以来,世界各地频繁发生列车脱轨事故并造成大量人员伤亡和经济损失,发生于露天的脱轨事故造成的结构破坏尚不具有连续性,对于铁路客站这类人员密集的大型交通枢纽,列车轨道贯穿客站内部,列车一旦发生脱轨事故,不仅会对结构造成破坏,更有可能引起结构的连续性倒塌,其次生灾害难以想象。站台雨棚结构通常临近铁路轨道且在站台候车的人员多直接面临着遭受列车脱轨及其造成的次生灾害的风险。在我国既有高铁客站的雨棚结构中,无站台柱张弦梁雨棚结构的数量所占的比例较大,此类结构的冗余度较低,抵抗连续性倒塌的能力较弱,因此对张弦梁雨棚结构在脱轨列车撞击作用下的倒塌破坏研究迫在眉睫。本文基于拆除构件法对典型的张弦梁雨棚结构进行了倒塌数值模拟,本文同时采用足尺列车模型对基于多尺度技术建立的雨棚结构模型进行了撞击数值模拟。论文的主要研究成果如下：1.在两种使雨棚结构的雨棚柱失效的研究方式下,雨棚结构均只在失效雨棚柱的支撑范围内发生局部倒塌而不会发生结构的连续性倒塌。2.通过基于拆除构件法的倒塌数值模拟得知角柱、中边柱及其相邻柱失效时雨棚结构的局部倒塌破坏较为严重。3.通过对两个张弦梁雨棚结构倒塌破坏情况和倒塌破坏程度的对比,阐明了柱间斜撑和檩条间斜撑这两种造措施以及每榀张弦梁的间距是影响张弦梁雨棚结构抗倒塌性能的主要因素。4.通过采用不同的碰撞初速度对雨棚柱进行撞击的数值模拟得知,在到发线轨道上以最高时速脱轨的列车与雨棚柱发生撞击后将不会使被撞击的雨棚柱失效,在正线轨道上以最高时速脱轨的列车与雨棚柱发生撞击后将使被撞击的雨棚柱失效,并极有可能撞击下一根雨棚柱。5.通过对两种研究方式下雨棚结构响应的对比,说明了拆除构件法在工程结构抗倒塌分析与设计中的有效性。
[Abstract]:Since the beginning of the 21st century, train derailment accidents have occurred frequently all over the world, resulting in a large number of casualties and economic losses. The structural damage caused by the derailment accidents in the open air has not been continuous. For a large transportation hub such as a railway passenger station, the train track runs through the passenger station. Once the train derails, it will not only destroy the structure, but also cause the continuous collapse of the structure. Its secondary disasters are unimaginable. The platform rain shed structure is usually close to the railway track and most of the people waiting on the platform face the risk of train derailment and the secondary disaster caused by it. In the rain shed structure of the existing high-speed railway passenger station in China, the number of the structure without platform string beam is larger, the redundancy of this kind of structure is low, and the ability to resist the continuous collapse is weak. Therefore, it is urgent to study the collapse and failure of the beam-string rain shed structure under the impact of derailment train. In this paper, the collapse numerical simulation of typical beam string rain shed structure is carried out based on the method of removing components. At the same time, the full-scale train model is used to carry out the impact numerical simulation of the rain shed structure model based on multi-scale technology. The main research results are as follows: 1. Under the two kinds of research methods that make the shed structure fail, the rain shed structure only occurs local collapse within the support range of the failed shed column, but not the continuous collapse of the structure. 2. Through numerical simulation of collapse of corner column based on the method of removing components, it is found that the local collapse damage of the structure of rainshed is serious when the middle side column and its adjacent columns fail. Through the comparison of the collapse failure and the collapse degree of the two beam-string rain shed structures, It is expounded that the two kinds of construction measures of inclined bracing between columns and purlins and the spacing of each beam string are the main factors that affect the collapse resistance of the rain shed structure of the beam string. 4. Through the numerical simulation of the impact of the shed column with different initial impact velocities, it is concluded that the train derailed at the highest speed on the departure line will not invalidate the shelter post after it hits the shed column. A train derailed at a maximum speed on the main track will be struck against the shed post and will most likely hit the next shed post. 5. 5. Based on the comparison of the structural responses of the two kinds of research methods, the effectiveness of the method of removing the components in the analysis and design of the collapse resistance of the engineering structures is illustrated.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU312.3
本文编号：2396238
[Abstract]:Since the beginning of the 21st century, train derailment accidents have occurred frequently all over the world, resulting in a large number of casualties and economic losses. The structural damage caused by the derailment accidents in the open air has not been continuous. For a large transportation hub such as a railway passenger station, the train track runs through the passenger station. Once the train derails, it will not only destroy the structure, but also cause the continuous collapse of the structure. Its secondary disasters are unimaginable. The platform rain shed structure is usually close to the railway track and most of the people waiting on the platform face the risk of train derailment and the secondary disaster caused by it. In the rain shed structure of the existing high-speed railway passenger station in China, the number of the structure without platform string beam is larger, the redundancy of this kind of structure is low, and the ability to resist the continuous collapse is weak. Therefore, it is urgent to study the collapse and failure of the beam-string rain shed structure under the impact of derailment train. In this paper, the collapse numerical simulation of typical beam string rain shed structure is carried out based on the method of removing components. At the same time, the full-scale train model is used to carry out the impact numerical simulation of the rain shed structure model based on multi-scale technology. The main research results are as follows: 1. Under the two kinds of research methods that make the shed structure fail, the rain shed structure only occurs local collapse within the support range of the failed shed column, but not the continuous collapse of the structure. 2. Through numerical simulation of collapse of corner column based on the method of removing components, it is found that the local collapse damage of the structure of rainshed is serious when the middle side column and its adjacent columns fail. Through the comparison of the collapse failure and the collapse degree of the two beam-string rain shed structures, It is expounded that the two kinds of construction measures of inclined bracing between columns and purlins and the spacing of each beam string are the main factors that affect the collapse resistance of the rain shed structure of the beam string. 4. Through the numerical simulation of the impact of the shed column with different initial impact velocities, it is concluded that the train derailed at the highest speed on the departure line will not invalidate the shelter post after it hits the shed column. A train derailed at a maximum speed on the main track will be struck against the shed post and will most likely hit the next shed post. 5. 5. Based on the comparison of the structural responses of the two kinds of research methods, the effectiveness of the method of removing the components in the analysis and design of the collapse resistance of the engineering structures is illustrated.
【学位授予单位】：西南交通大学
【学位级别】：硕士
【学位授予年份】：2014
【分类号】：TU312.3
【引证文献】
相关硕士学位论文 前1条
1 胡国震;无站台柱雨蓬基于性能的抗连续倒塌设计研究[D];西南交通大学;2016年
，本文编号：2396238
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