铁路隧道钢筋混凝土衬砌结构可靠度分析

Reliability Analysis of Reinforced Concrete Lining Structure for Railway Tunnel

研究目的:针对现行《铁路隧道设计规范》中钢筋混凝土构件极限状态方程存在的不足,本文细分钢筋混凝土衬砌中钢筋的各种受力状态,并寻求更精确适用的功能函数及可靠度计算方法,为按可靠度理论修订《铁路隧道设计规范》提供参考。研究结论:(1)基于荷载-结构法模型,通过调研分析得出钢筋受力状态判断的界定方程,建立了适用于隧道钢筋混凝土衬砌结构的大、小偏心受压构件的功能函数及极限状态方程;(2)根据钢筋混凝土衬砌功能函数,应用JC法基本原理,通过分析推导提出一套钢筋混凝土衬砌结构可靠度分析方法,并在铁路隧道标准图衬砌可靠指标计算中得到成功验证;(3)本文提出的钢筋混凝土衬砌的功能函数及可靠度分析方法可直接指导铁路隧道钢筋混凝土衬砌设计。

Research purposes： Aiming at the shortage of the existing code for design of railway tunnel in the presence of reinforced concrete members limit state equation, we subdivide the destruction state of reinforcement, and seek the functions suitable for reinforced concrete lining, and establish the reliability analysis method in order to provide reference for railway tunnel design code revision based on reliability theory. Research conclusions： （1）Based on the load structure model, through the investigation and analysis, the defined equation of the stress state of the reinforced bar is obtained, and applicable to large and small eccentric compressive members of reinforced concrete tunnel lining structure function and limit state equation was established. （2）According to the reinforced concrete lining function, using JC method basic principle, through the analysis and derivation, we put forward a set of the reliability analysis method suitable for reinforced concrete lining structure, and proved to be successful in the reliability index calculation of Railway Tunnel standard drawing lining. （3）The reinforced concrete lining function and the reliability analysis method can be directly used to guide the design of the railway reinforced concrete tunnel lining.