Abstract：Research purposes ： Railway tunnel portal is a complicated spatial structural system. Based on the structure reliability，a set of research methods of reliability for tunnel portal structure are established. Research results can provide references for the design and code revising of railway tunnel portal.
Research conclusions :(1) According to the failure models of railway tunnel portal structure，it is considered to be in series system. Reliability index and failure probability of structural systems are employed in quantitatively evaluating reliability of railway tunnel portal structure. An approximate method is a kind of simple and accurate computing way to calculate the reliability of railway tunnel portal structure. (2) An approach for reliability calculation method of railway tunnel portal structure is given，and demonstrated by examples. A calculation example shows the safe probability of end wall portal structure system of single track railway tunnel that allows the speed of 140 kir^h can be more than 99. 22%， and the main failure mode of structure system is overturning. (3) In this paper， the tunnel portal limit state design method can be directly used to guide the design of railway tunnel portal structure.
赵万强1,周佳媚2，蒙国往2，冯天炜2. 铁路隧道洞门体系极限状态及可靠度研究[J]. 铁道工程学报, 2015, 32(10): 98-102.
ZHAO Wan - qiang1，ZHOU Jia - mei2，MENG Guo - wang2，FENG Tian - wei2. Research on the System Limit State and Reliability of Railway Tunnel Portal Structure. Journal of Railway Engineering Society, 2015, 32(10): 98-102.
2015, Vol. 32 
版权所有 © 2014 《铁道工程学报》编辑部