【作者】 蒋丽忠； 余建； 周旺保； 冯玉林； 彭康； 左永健；

【Author】 JIANG Li-zhong;YU Jian;ZHOU Wang-bao;FENG Yu-lin;PENG Kang;ZUO Yong-jian;School of Civil Engineering, Central South University;National Engineering Laboratory for High Speed Railway Construction, Central South University;School of Civil Engineering and Architecture, East China Jiaotong University;

【机构】 中南大学土木工程学院； 中南大学高速铁路建造技术国家工程实验室； 华东交通大学土木建筑学院；

【摘要】 铁路运输作为抗震救灾的重要生命线,在抗震救灾期和灾后重建期承担了极其重要的运输任务,研究震致钢轨不平顺是保证震后行车安全的基础。本文以高速铁路CRTSⅡ型轨道-桥梁系统为对象,建立了有限元模型并开展了试验验证,从PEER强震数据库中筛选出40条和设计反应谱匹配程度最高的地震波并对有限元模型开展了非线性时程分析,研究了横向地震作用后钢轨残余不平顺的分布规律,基于随机振动理论和假设检验原理提出了震致钢轨几何不平顺功率谱密度曲线的确定方法,构造了震致钢轨几何不平顺样本。研究结果表明:震后钢轨残余轨距、高低和水平不平顺的幅值较小,轨向不平顺的幅值较大;对于采用CRTSⅡ型板式无砟轨道的高速铁路多跨简支梁,震后钢轨残余轨向变形主要集中在靠近路基约200m的范围内;其余空间范围内的轨向不平顺特征相对稳定,其不平顺特征可以通过一个较小的空间样本进行预测;靠近路基约200m的范围内的震后钢轨残余不平顺应按照非平稳信号进行处理,其余空间范围内的轨向不平顺可近似按照平稳信号进行处理;随机地震作用下平稳钢轨残余不平顺在各个频率的功率谱密度服从对数正态分布,非平稳段不平顺在各个时间-频率节点上的功率谱密度服从对数正态分布。更多还原

【Abstract】 As an important lifeline for earthquake relief, railway transportation has undertaken extremely important transportation tasks during the earthquake relief period and post-disaster reconstruction period.Research on the rail irregularities caused by the earthquake is the basis for ensuring the safety of train after earthquakes. In this paper, a finite element model of a simply-supported high-speed railway beam bridge with the China Railway Track System(CRTS) Ⅱ was established and experimental verification was carried out. 40 seismic waves with the highest matching degree with the design response spectrum were selected from the PEER database. The distribution law of rail irregularity after transverse earthquake was studied. Based on random vibration theory and hypothesis testing principle, a method to determine the power spectral density curve of seismic induced rail geometric irregularity was proposed, and sample of seismic induced rail geometric irregularity was constructed. The results show that: the amplitude of residual gauge, vertical and cross-level irregularity is small, and the amplitude of residual alignment irregularity is large; the residual alignment deformation is mainly concentrated in the area about 200 meters away from the subgrade; the track irregularity characteristics in the rest space are relatively stable, which can be predicted by a small space sample; the residual rail irregularity within 200 m near the subgrade should be processed as non-stationary signal, and the track irregularity in the rest space can be processed as stationary signal approximately; the power spectral density of stationary rail residual irregularity at each frequency obeys logarithmic normal distribution, and the power spectral density of non-stationary rail irregularity at each time frequency node obeys logarithmic normal distribution.更多还原