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中文摘要：
针对我国既有线部分桥梁横向刚度不足引发列车脱轨的情况，进行列车脱轨机理、列车脱轨分析理论以及铁路桥梁横向刚度限值研究。主要研究内容和结论如下。
英文摘要：
Considering the problem that train derailment on existing railway bridges is caused by the scarcity of bridge lateral rigidity, the mechanism of train derailment, the analysis theory of train derailment and the limit value of lateral rigidity for railway bridges are extensively studied. The main contents and conclusions of the dissertation are as follows.
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