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双层钢管混凝土是一种新型钢-混组合结构,可用于制作高层建筑的柱。自密实混凝土使用方便,可确保双层钢管混凝土短柱的质量。对双层钢管混凝土短柱耐火性能的研究很少,这对于其在高层建筑中的应用非常重要。为研究双层钢管自密实混凝土短柱及双层钢管纤维增强自密实混凝土短柱的耐火性能,进行了标准耐火试验。研究失效模型、温度分布、临界温度及耐火极限承载力,结果表明,纤维对温度分布无影响;增大混凝土厚度或管周长能降低双层钢管自密实混凝土柱的温度;钢纤维能提高60%的耐火极限承载力;双层钢管混凝土的临界温度高于钢管或钢管混凝土。
Double-skinned concrete is a new type of steel-concrete hybrid structure that can be used to make high-rise columns. Self-compacting concrete is easy to use and ensures the quality of double concrete-filled steel tubular short columns. There are few studies on fire resistance of double-skinned concrete filled steel tubular short columns, which is very important for its application in high-rise buildings. In order to study the fire resistance of double-layer self-compacting concrete filled steel tubular short columns and double-layer steel fiber reinforced self-compacting concrete short columns, a standard fire resistance test was carried out. The failure model, temperature distribution, critical temperature and ultimate load-bearing capacity were studied. The results show that the fiber has no effect on the temperature distribution. Increasing the thickness of concrete or the tube circumference can reduce the temperature of self-compacting double- Fire-resistant ultimate capacity; the critical temperature of double-skinned concrete is higher than that of steel or concrete.