单线铁路隧道洞门结构分项系数的研究

Analysis of Partial Coefficients of Single-Track Railway Tunnel Portal Structures

根据隧道洞门结构的计算特点 ,建立了隧道洞门可靠度计算的极限状态设计式 ,分析了在已知目标可靠指标 βnom的情况下 ,用分位值法计算洞门结构分项系数的基本原理和过程。通过计算实例 ,对分项系数的影响因素及其概率意义进行了探讨。

According to the calculation characteristics of railway tunnel portal structure, the limit states design equations of tunnel portal structure reliability are established. Based on the given object reliability index β nom , the partial coefficients of tunnel portal structure are calculated, and the basic principle and specifics process of the calculation are presented. In addition to that, the influencing factors and probabilistic meanings of the partial coefficients are discussed through a practical example.