南京长江隧道管片结构耐火性分析

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Abstract Research purposes: Taking the segment structure of Nanjing Yangtze River Tunnel as an example，the analysis is made for the shield segment with the three － dimensional method，and the study is done on the stress redistribution，steel bar security，structural deformation，crack expending and change of the bearing capacity of segment structure under the effect of the interior non － uniform temperature field in fire conditions． Especially the study is done mainly on the steel bar stress state under combined water and soil pressure ， in order to judge the structure security．

Research conclusions: The study results show that by using fireproof coating，the segment structure and its internal steel bar can safely withstand 250 degrees temperatures within two hours when firing． This study is significant to reducing engineering cost by application of reasonable fire － resisting material，minimizing the structural damage by fire，prolonging the service life of shield tunnel after fire and post － disaster repairing tunnel．

Key words： Nanjing Yangtze River Tunnel fire － resisting finite element

Received: 07 January 2011

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U25

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	Analysis of Fire Resistance of Segment Structure of Nanjing Yangtze River Tunnel

Cite this article:

Analysis of Fire Resistance of Segment Structure of Nanjing Yangtze River Tunnel. Analysis of Fire Resistance of Segment Structure of Nanjing Yangtze River Tunnel[J]. 铁道工程学报, 2011, 28(4): 67-70.

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http://tdgcxb.crec.cn/EN/ OR http://tdgcxb.crec.cn/EN/Y2011/V28/I4/67

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