| Currently, the construction of anti-fire has become a hot topic in the field of disaster prevention and mitigation. With the rapid development of urbanization, contemporary architecture toward multi direction and multi function requirements of the vertical changes caused by the structure system of the building is not continuous, it often requires the change in vertical structure set the structure conversion layer, and beam-column transfer structure is one of the most common forms of conversion structure. Transformation structure as an important and key part of building structure system,the research on the bearing capacity of fire under high temperature has important theoretical and practical significance. In this paper, the beam-column transfer structure of the transfer beam and column connections trustee for the study. Comparative analysis of the effect of high temperatures and fire conditions different column rigid ratio distribution and thermal coupling of the temperature deformation of beam-column joints under different market conditions experienced. The establishment of a simplified calculation method for residual flexural capacity of action by the fire after three conversions sectional joists using the finite element method.The main research contents and results are as follows.(1) Based on the ISO 834 standard liters cooling curve,Summarized some of the research achievements on the performance of reinforced concrete material thermal and strength effect after the fire. Using ABAQUS software calculated and analyzes three dimensions corbels column joint model in three one-sided distribution of temperature field and thermal effects of different heating and cooling time, Summarized the size effect on the temperature field.(2) Based on the ISO 834 standard liters cooling curve, using ABAQUS software in three different sizes corbel column joint model was calculated deformation of the whole process of heating and cooling. Comparative analysis of the corbel column node model in case of fire and fire after experiencing deformation law. And summarized the different law than the deformation impact beams size.(3) Based on the ISO 834 standard liters cooling curve, after the fire beam temperature field analysis on three sides,the establishment of a simplified calculation method for residual flexural capacity of action by the fire after three conversions sectional joists using the finite element method. And for the calculation results and ABAQUS software specific example of calculation results of the analysis were compared with the degree of good agreement between the both. |
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