Abstract
Because of its advantages of light weight, high strength and convenient construction, steel structure has gradually become the first choice for large-span and high-rise structures. The use of high strength steel in building engineering can reduce the section size of components and the weight of the structure, thus increasing the building area. But steel is not fire-resistant, when the temperature reaches 600°C, steel loses most of the stiffness and strength. Therefore, it is of great significance to study the fire resistance of steel structures, and the mechanical properties of steel structures at high temperature are the foundation of the fire resistance research. The mechanical properties of steel after high temperature are the basis for the safety assessment of steel structure after fire. Therefore, this paper studies the mechanical properties of Q345 steel after high temperature cooling.
Highlights
With the increasing number of fire accidents around the world, the study of high temperature mechanical properties of steel is a hot topic
It is of great significance to study the fire resistance of steel structures, and the mechanical properties of steel structures at high temperature are the foundation of the fire resistance research
The tensile test of Q345 steel naturally cooled at room temperature (20 ̊C, 250 ̊C, 500 ̊C and 750 ̊C) was carried out, and the variation law of the mechanical properties parameters such as stress-strain curve, yield strength, ultimate strength, elastic modulus and elongation with the increase of temperature was obtained
Summary
With the increasing number of fire accidents around the world, the study of high temperature mechanical properties of steel is a hot topic. The research on high temperature properties of steel mainly focuses on the mechanical properties under high temperature. This paper studies the influence of mechanical properties such as the flexural strength of refractory steel columns [1]. He conducted an experimental study on the mechanical properties of Q235 steel, the most commonly used steel structure building, at high temperature. He obtained the law of the variation of various mechanical properties of Q235 steel with temperature, es-
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