【摘要】：進入21世紀以來,世界各地頻繁發(fā)生列車脫軌事故并造成大量人員傷亡和經(jīng)濟損失,發(fā)生于露天的脫軌事故造成的結構破壞尚不具有連續(xù)性,對于鐵路客站這類人員密集的大型交通樞紐,列車軌道貫穿客站內部,列車一旦發(fā)生脫軌事故,不僅會對結構造成破壞,更有可能引起結構的連續(xù)性倒塌,其次生災害難以想象。站臺雨棚結構通常臨近鐵路軌道且在站臺候車的人員多直接面臨著遭受列車脫軌及其造成的次生災害的風險。在我國既有高鐵客站的雨棚結構中,無站臺柱張弦梁雨棚結構的數(shù)量所占的比例較大,此類結構的冗余度較低,抵抗連續(xù)性倒塌的能力較弱,因此對張弦梁雨棚結構在脫軌列車撞擊作用下的倒塌破壞研究迫在眉睫。本文基于拆除構件法對典型的張弦梁雨棚結構進行了倒塌數(shù)值模擬,本文同時采用足尺列車模型對基于多尺度技術建立的雨棚結構模型進行了撞擊數(shù)值模擬。論文的主要研究成果如下：1.在兩種使雨棚結構的雨棚柱失效的研究方式下,雨棚結構均只在失效雨棚柱的支撐范圍內發(fā)生局部倒塌而不會發(fā)生結構的連續(xù)性倒塌。2.通過基于拆除構件法的倒塌數(shù)值模擬得知角柱、中邊柱及其相鄰柱失效時雨棚結構的局部倒塌破壞較為嚴重。3.通過對兩個張弦梁雨棚結構倒塌破壞情況和倒塌破壞程度的對比,闡明了柱間斜撐和檁條間斜撐這兩種造措施以及每榀張弦梁的間距是影響張弦梁雨棚結構抗倒塌性能的主要因素。4.通過采用不同的碰撞初速度對雨棚柱進行撞擊的數(shù)值模擬得知,在到發(fā)線軌道上以最高時速脫軌的列車與雨棚柱發(fā)生撞擊后將不會使被撞擊的雨棚柱失效,在正線軌道上以最高時速脫軌的列車與雨棚柱發(fā)生撞擊后將使被撞擊的雨棚柱失效,并極有可能撞擊下一根雨棚柱。5.通過對兩種研究方式下雨棚結構響應的對比,說明了拆除構件法在工程結構抗倒塌分析與設計中的有效性。
[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.
【學位授予單位】：西南交通大學
【學位級別】：碩士
【學位授予年份】：2014
【分類號】：TU312.3

【引證文獻】

相關碩士學位論文 前1條

1 胡國震;無站臺柱雨蓬基于性能的抗連續(xù)倒塌設計研究[D];西南交通大學;2016年

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本文編號：2396238