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为了探索约束钢梁的高温性能及不同温度路径和参数的影响,本文采用大型有限元程序ANSYS对四种不同温度路径和四个不同参数下约束钢梁的性能反应进行分析研究。计算时充分考虑了高温引起的材料非线性和几何非线性,其中钢材的力学和物理性能指标随温度升高的变化系数按照欧洲规范(EUROCODE3)取用。本文首先对两端固定约束钢梁在温度连续升高时的性能反应进行了分析,并将分析结果与已有研究成果进行对比,验证了本文分析方法的正确性。在此基础上,又对升温-降温、升温-恒温-降温、升温-降温-升温等不同温度路径下约束钢梁的性能进行分析,研究了不同温度路径对钢梁高温性能的影响。最后探索了降温速率、历史最高温度、降温最低温度以及升降温循环次数等参数对约束钢梁性能反应的影响。
In order to explore the high-temperature performance of constrained steel beams and the influence of different temperature paths and parameters, large-scale finite element program ANSYS was used to analyze the performance of four constrained steel beams under four different temperature paths and four different parameters. The material nonlinearity and geometrical nonlinearity caused by high temperature are fully considered in the calculation. The coefficient of variation of the mechanical and physical properties of the steel with increasing temperature is taken into account according to European Standard (EUROCODE3). In this paper, the performance of steel beams with fixed constrained beams at both ends are analyzed when the temperature rises continuously. The analysis results are compared with the existing research results to verify the correctness of the analysis method. On this basis, the properties of steel beams under different temperatures such as heating, cooling, heating, constant temperature, cooling, heating, cooling and heating are analyzed. The influence of temperature paths on the high temperature performance of steel beams is studied. Finally, the effects of the cooling rate, the maximum temperature, the minimum cooling temperature and the number of heating and cooling cycles on the performance of confined steel beams were explored.