| In recent years, with the development of China’s economic, the tunnel is the increasingly used andtunnel fires occur frequently. High temperature of fire damages the tunnel lining structure in differentdegree which reduces the security of lining structure. As the tunnel is a narrow structure, unevendistribution of longitudinal temperature causes internal force redistribution of tunnel lining structure,and the presence of obvious constraints is among the lining segments along the longitudinal direction.Therefore, research on fire resistance play an important practical role in the tunnel lining structure underthe condition of uneven fire.3D finite element model of tunnel lining structure was built by the finite element softwareABAQUS. The lining of the displacement, internal force changes with time by the fire and fireresistance of structure were obtained by numerical simulation. The main contents are detailed asfollows:1. Based on analyzing and summarizing research results at home and abroad, chose thermalproperties and thermodynamic model of materials under high temperature.2.3D analysis model of tunnel lining structure was built by the finite element software ABAQUS,application of test data on the calculated results of temperature fields and mechanical were verified.3. Analyzed response of tunnel lining structure under uneven distribution of longitudinaltemperature was analyzed by validated model.4. The longitudinal constraint, fire peak temperature, heating rate, ground overload, the lateralpressure coefficient, the strength grade of steel and concrete are choosed to study the effect to thedeformation and internal force of tunnel lining structure.5. Three kinds of refractory limit judging standard was compared and temperature controlcriterion was selected to go on the parameter analying of fire resistance limit. |
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