Analysis Of Temperature And Fire Of The Large-Span Truss Stucture

The truss structure was composed of more than one rod at a certain grid nodes and connected to constitute spatial structure covering a large span, with the advantages ofheavily-baredspace force, light weight, stiffness, good seismic performance, suitable for industrial production and the overall lifting after the ground assemble. In recent years, with its unique advantages, the network structure has been widely used in the roof of the buildings, such as stadiums, theaters, exhibition halls, waiting rooms, stadium bleachers, awning, aircraft hangars, two-way large spacing workshops, and so on. However, with the relatively large thermal expansion coefficient, and the steel grid generally used for large spatial coverage, the internal force and displacement caused by temperature alternately changes of the large span steel structure can not be ignored. Additionally, the steel truss roof are used in railway stations, airports, stadiums and other public buildings, so it was very important to explore its safety in the extreme cases, such as fire. The paper took s truss structure roof a new train station as the research target, using ANSYS finite element analysis software to establish the grid model, and made explores and analysis as following, from the respects of influence on temperature changes n the steel structure and fire on the building structure:Under the circumstance of ANSYS, established two models of the roof fixed bearing and the transfer of bearing, analyzed comparatively on the roof as a whole in the same temperature change caused by bearing reaction force, displacement and internal force, and carried out the influence on the performance of truss roof structure by different bearing with the overall temperature.Under the circumstance of ANSYS, established a roof model, using the transient analysis method and with the overall structure of the fire resistance of the simulation study as the center, imposed the temperature load to the standard heating curve of the structure, and drew the curve of displacement and the internal force showing structure change over time and varying with temperature, based on the constitutive relation of the existing steel high temperature performance and steel components heating model.With the hope of making contribution to the research of steel structure, at the end of each chapter, the paper made a systematic and valuable conclusion to the issue discussed in the chapter.