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《Journal of Zhejiang University(Engineering Science)》 2018-05
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Meso damage evolution of tunnel lining concrete under fire

WANG Wei;LIU Ou;CAO Kun;XU Zhi-sheng;School of Civil Engineering,Central South University;  
The heterogeneity of concrete structure needs to be considered for the study of concrete damage,in order to objectively reflect the essence of the high temperature damage of concrete.A numerical model was established to analyze the meso-damage process of concrete under thermal mechanical coupling combined with meso-damage mechanics.The model considered the stress state at the top of the tunnel lining.The mechanical behavior and damage process of tunnel lining concrete in the course of fire were analyzed.Results show that the influence of fire on the mechanical properties and damage evolution process of tunnel lining concrete is significant,and the mechanical properties of the interface determine the differences in macroscopic strength.The cumulative equivalent burning loss depth of tunnel lining concrete under the RABT fire loading shows curve variation based on the strength equivalence theory.In the mesoscale numerical simulation,there is a good linear relationship between the damage unit ratio and the equivalent burning loss depth.
【Fund】: 国家自然科学基金资助项目(51676210);; 湖南省自然科学基金资助项目(2018JJ2519)
【CateGory Index】: U451
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