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中文摘要：
方钢管混凝土柱的抗火性能与设计是其在工程实践中的关键问题之一,因而众多国内外学者对此进行了研究。但是,现有研究及其成果和现行规范或规程大多假设其四面均匀受火,而实际火灾中方钢管混凝土柱也可能存在单面、两面及三面等非均匀受火边界。受火边界的改变,使非均匀受火的方钢管混凝土柱受力机制和抗火性能与四面受火情况有所不同。为此,研究了一种典型非均匀受火边界,即相对两面受火条件下方钢管混凝土柱的抗火性能,在大量参数分析的基础上,提出了相对两面受火时方钢管混凝土承载力影响系数的简化公式,可用于评估该火灾条件下方钢管混凝土柱耐火极限,以供工程实践参考。
英文摘要：
The fire resistance behaviour and design of concrete-filled SHS（square hollow sections） columns are one of the key issues in practice, thus many researchers abroad and at home are concerned with this field. Previous research and codes are based essentially on a four-side heated boundary hypothesis. However, concrete-filled SHS columns may be exposure to non-uniform fires, including one-side fire, two adjacent sides fire and three-side fire. There are different fire resistance behaviors between non-uniform fire conditions from four-side fire condition. The research herein focuses on one of the non-uniform fire types-two-opposite-side fire, to study the fire resistance of concrete filled SHS. Based on parametric analysis, simplified calculation formula for predicting the residual load bearing capacity was deduced through massive calculation and the formula is expected to be used in the design of the fire resistance of the concrete-filled SHS being exposure to two-opposite-side fire.
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