方形薄壁钢管混凝土柱的耐火性能研究

Study on fire behaviour of square concrete-filled thin-walled steel tubular columns

为研究薄壁钢管混凝土柱的耐火性能,进行4个方形薄壁钢管混凝土柱在标准升温曲线下的耐火试验。试验参数为荷载偏心率、是否设置加劲肋以及是否设置防火保护。基于试验结果,研究方形薄壁钢管混凝土柱在高温下的破坏模态、温度场分布和耐火极限,并将其耐火性能和普通钢管混凝土柱进行比较。试验结果表明,方形薄壁钢管混凝土柱具有较好的耐火性能。

This paper presents an experimental investigation on the behaviour of square concrete-filled thin-walled steel tubular columns subjected to standard fire.The tests,including four specimens,were performed to examine the influences of the following parameters,i.e.loading eccentric ratio,with stiffeners or not and with fire-protection or not,on the fire behaviour of this type of composite columns.Based on the test results,the failure mode,temperature filed,and fire-resistance of the tested models were investigated experimentally,and compared to those of the conventional concrete-filled steel tubular columns.The test results indicate that the square concrete-filled thin-walled steel tubular columns have good fire behaviour within current testing limitations.