Because of its advantages of light weight, high strength and convenient construction,\nsteel structure has gradually become the first choice for large-span\nand high-rise structures. The use of high strength steel in building engineering\ncan reduce the section size of components and the weight of the structure,\nthus increasing the building area. But steel is not fire-resistant, when the\ntemperature reaches 600 Degree C, steel loses most of the stiffness and strength.\nTherefore, it is of great significance to study the fire resistance of steel structures,\nand the mechanical properties of steel structures at high temperature\nare the foundation of the fire resistance research. The mechanical properties\nof steel after high temperature are the basis for the safety assessment of steel\nstructure after fire. Therefore, this paper studies the mechanical properties of\nQ345 steel after high temperature cooling.
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