Fire-Resistant Analysis Of Steel Structure Member Based On Transient Heat Transfer

Because the architectural velocity of the steel structure is quick, its aseismatic function is good, is architectural fa?ade is beautiful and changeful. At the same time, its application foreground will be very extensive along with the output of the steel became more and more. Although the poor fire-resistance ability is the main weakness of steel structure in that its mechanical property such as strength and elastic modulus decrease severely in high temperature. When fire occurs, severe damage or global collapse will happen to the steel structure. In china, test-based fire resistance design method is the prevailing fire resistance design method for steel structures. However, using the test-based fire resistance design method, it is costly and hard to simulate the magnitude and distribution of loads and the end restriction conditions of the specimens in the structure. The ultimate fire resistance of the steel structure and the fire protection measures can be determined through calculation-based fire resistance design method. Therefore, a thorough study of the calculation-based fire resistance design method has great theoretical significance and practical value. The calculation method of fire safety of steel structure member brought forward is based on the analysis of a great deal of parameter. And the paper is on the basic of nonlinear finite, heat transfer and mechanics of elasticity, the heat transfer model and mechanics modal forced on static load and thermal load of a steel structure member under fire is simulated by the software of ANSYS。This paper simulated steel structure member respond to temperature in the fire, and display the temperature distributing nephogram and variational carve of some given nodes in the section. In according to comparing the different temperature distributing of the different section and the different fashion bearing fire, we can get that increasing the thickness of the web plate is very important to the fire-resistant of steel structure. Finally, this paper carried the thermal-structural coupled calculation of steel structure member, and establish the relation of the steel structure fire-resistant and the time in the fire, and analyzed the response of the steel structure in the whole process...