正常使用极限状态下CRTSⅡ型轨道板体系可靠度分析  

System Reliability of CRTSⅡTrack Slab Considering Serviceability Limit State

作　　者：张玄一 王基全 卢朝辉 赵衍刚 ZHANG Xuanyi;WANG Jiquan;LU Zhaohui;ZHAO Yangang(Shandong Railway Investment Holding Group Co.,Ltd.,Jinan 250102,China;Key Laboratory of Urban Security and Disaster Engineering of Ministry of Education,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]山东铁路投资控股集团有限公司,山东济南250102 [2]北京工业大学城市与工程安全减灾教育部重点实验室,北京100124

出　　处：《铁道学报》2022年第12期89-96,共8页Journal of the China Railway Society

基　　金：国家自然科学基金(52108104,51820105014,U1934217)。

摘　　要：列车荷载和温度作用下,CRTSⅡ型轨道板存在多重适用性失效模式,如纵向裂缝宽度过大、横向开裂以及翘曲变形等。在综合考虑上述适用性失效模式的基础上,研究CRTSⅡ型轨道板正常使用极限状态下的体系可靠度。首先研究CRTSⅡ型轨道板服役期间承受的列车荷载和温度作用,探讨适用性失效模式的失效物理机制及相应的极限状态函数,建立CRSTⅡ型轨道板的体系极限状态函数。随后采用高阶矩法分析CRTSⅡ型轨道板的体系可靠度,并将结果与各个失效模式的可靠性进行比较。最终,通过敏感性分析研究温度作用对CRTSⅡ型轨道板体系可靠度的影响。结果表明:正常使用极限状态下CRTSⅡ型轨道板在温度梯度和轴向温度均值不同时为负数时具有较高的的体系可靠度;对单一失效模式的可靠度进行独立分析会高估轨道板的可靠性,因此有必要进行CRTSⅡ型轨道板体系可靠度分析;温度梯度和轴向温度作用对CRTSⅡ型轨道板的体系可靠度具有显著影响。Under the actions of train load and temperature,several serviceability failure modes of the China Railway Track System(CRTS)Ⅱtrack slab exist such as excessive longitudinal crack width,lateral cracking,and deformation.In this study,the system reliability of CRTSⅡtrack slab under the serviceability limit state was investigated considering serviceability failure modes.The individual performance functions corresponding to these serviceability failure modes were firstly investigated,based on which the system limit state function of the track slab was constructed.Then,using method of moments,the system reliability of the track slab was analyzed,and the result was compared with the reliabilities of individual failure modes.Ultimately,the influence of temperature on the system reliability was investigated by sensitivity analysis.The results indicate that the system reliability of the track slab under the serviceability limit state is at a relatively high level when the mean values of temperature gradient and axial temperature are not negative simultaneously;as the reliability of the track slab will be overestimated by the independent reliability analysis of individual failure modes,it is necessary to conduct system reliability analysis of the CRTSⅡtrack slab;the system reliability of the track slab is significantly affected by temperature gradient and axial temperature.

关 键 词：CRTSⅡ型轨道板 正常使用极限状态 体系可靠度 体系极限状态函数 高阶矩法 

分 类 号：U213.244[交通运输工程—道路与铁道工程]