Method for determining temperature distribution of existing subway station concrete structure in fire disaster

Abstract

The invention discloses a method for determining temperature distribution of an existing subway station concrete structure in a fire disaster. The method is characterized in that a flac3d is used to construct heat convection and heat radiation superposed thermal fields except from the concrete structure; according to an objective fact that the properties of materials are different due to different temperatures, material parameters are regulated in real time with temperature rise in a simulating process, so that the simulated results are relatively accurate; changes of the structure thermal fields of three fire sources on set positions are simulated during a period with temperature ranging from 4 DEG C to 1000 DEG C. The method comprises the following steps: establishing a station model, establishing fire disaster thermal fields, setting model parameters, setting thermal field monitoring section and analyzing results. The method can be used for analyzing the concrete structure temperature in a fire disaster process of a complex subway station.

Description

technical field [0001] The invention relates to underground engineering fire research, in particular to the research on concrete structure temperature during a fire process of a subway station under a complex structure. Background technique [0002] In the event of a subway station fire, the high temperature will lead to the deterioration of the mechanical properties of the concrete, reducing the bearing capacity of the station structure, and directly affecting the safe use of the station. On the other hand, as the temperature of the fire source increases, the temperature of the concrete structure of the station also gradually increases. Various cables and facilities are arranged inside and around the concrete structure, and high-temperature concrete will affect the normal use of these cables and facilities. , affect the working performance of the station, and even make the station out of control, causing serious accidents. Therefore, it is important to grasp the change law...

AI Technical Summary

Problems solved by technology

[0002] When a subway station fires, the high temperature will lead to the deterioration of the mechanical properties of the concrete, reducing the bearing capacity of the station structure, and directly affecting the safe use of the station.

On the other hand, as the temperature of the fire source increases, the temperature of the concrete structure of the station also gradually increases. Various cables and facilities are arranged inside and around the concrete structure, and high-temperature concrete will affect the normal use of these cables and facilities. , affect the working performance of the station, and even make the station out of control, causing serious accidents

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