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迄今为止,国内学者研究较多的是普通钢管混凝土柱的耐火性能,而对耐火钢-钢管混凝土柱的抗火性能研究报道较少。通过利用ANYSY有限元软件对普通圆钢管混凝土柱在火灾升温曲线下温度场的模拟,采用数值计算方法求解普通圆钢管混凝土柱耐火极限,与试验结果吻合很好。将普通钢管替换为耐火钢,研究耐火圆钢管混凝土柱耐火极限,并与普通圆钢管混凝土柱对比,发现在一定受火时间内耐火圆钢管混凝土柱耐火极限明显提高。
So far, the domestic scholars mostly study the fire resistance of ordinary CFST columns, while there are few reports about the fire resistance of fire-resistant steel-concrete filled steel tubular columns. By using ANYSY finite element software to simulate the temperature field of ordinary CFST column under the fire heating curve, the numerical calculation method is used to solve the fire resistance of ordinary CFST column, which is in good agreement with the experimental results. The ordinary steel pipe is replaced with refractory steel to study the fire resistance of refractory CFST columns. Comparing with ordinary CFST columns, it is found that the fire resistance of refractory CFST columns increases obviously during the fire time.