Study on the Influence of Moderate Fire on the Structure of Subway Stations
To investigate the impact of moderate fires on the structure of subway station sections,a combined method of shrinkage tests and three-dimensional unsteady finite element simulation was used to conduct 1∶4 scale shrinkage fire tests on subway station structures to explore the change response of reinforced concrete structure.The experimental results were compared and analyzed with the simulation results,and the main conclusion was that the temperature changes at the top plate,right wall,and bottom plate monitored by the experiment showed similar trends,while at the same monitoring depth,the temperature changes of the column were significantly higher than those of the plate and right wall;The strain caused by thermal load is a key factor causing the total strain of steel bars.The comparison between the experimental results and the simulation results indicates that there is a significant deviation in the temperature prediction of certain positions(such as the center of the right column)in the numerical simulation.Therefore,the three-dimensional non-stationary finite element model needs to be improved and perfected in application to make more accurate predictions.
moderate firereduced size experimentsimulationsubway station structure
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