摘要
在考虑衬砌混凝土和钢筋在高温下的非线性以及非线性温度荷载曲线的基础上,有限元数值模拟计算可获得衬砌在火灾发生前后的内部荷载,并且由温度传播分析和非线性结构分析模型计算得到火灾中衬砌的承载能力。该计算模型考虑衬砌材料力学性能随温度升高而降低的应力释放系数以及围岩与隧道衬砌之间的相互作用。此计算与时间增量历史有关,即考虑不同燃烧时间段材料力学参数的改变。除给出此项目在奥地利境内火灾下一个隧道截面安全设计计算结果外,还在计算中考虑高温荷载以及由高温荷载产生的影响。计算结果可以更好地帮助理解隧道衬砌在高温下的力学行为,便于对隧道结构设计进行火灾条件下的设计校核以及制定隧道衬砌结构火灾安全设计规范,为隧道结构火灾安全方面的设计计算和研究提供参考。
Based on the consideration of the nonlinear and nonlinear load-temperature curves of tunnel lining concrete and steel,the internal loads of lining before and after fire can be obtained by finite element numerical simulation;and the lining capacity in fire is got by the temperature spread analyses and nonlinear structural analysis model. The stress releasing coefficient of mechanical property of lining,which decreases with the temperature,and the interaction between tunnel lining and surrounding rock,is considered in the calculation model. The calculation is associated with the time increment history,in other words,the variation of mechanical parameters of materials at different fire time is considered. Besides the safety design results of a tunnel section in fire within Austrian region is put forward,the influence of high temperature load on the lining is also considered in the calculation. The calculation results can be better to help to explain the mechanical behavior of tunnel lining under high temperature. It can be convenient for the tunnel structure design check in fire and set the code for fire safety design of tunnel lining. The calculation results can also provide the reference to the design and study of tunnel lining in fire safety aspects.
出处
《岩石力学与工程学报》
EI
CAS
CSCD
北大核心
2010年第A02期3805-3811,共7页
Chinese Journal of Rock Mechanics and Engineering
基金
湖南省教育厅资助科研项目(06hnjy035)
中奥(奥地利)科技合作项目(国科外字[2006]328.No.26)
关键词
隧道工程
火灾
隧道衬砌
安全设计
有限元模拟
tunnelling engineering
fire
tunnel lining
safety design
finite element simulation
