中文摘要：

在轻骨料混凝土中掺入一定量的钢纤维，可有效抑制核心混凝土微裂缝的发展，改善轻骨料钢管混凝土柱的力学性能。但目前国内外对火灾后钢纤维增强轻骨料钢管混凝土柱的受力性能还缺乏研究。通过对15根受火后及3根未受火的钢纤维增强陶粒钢管混凝土短柱力学性能的对比试验研究，讨论了不同参数的钢纤维增强陶粒钢管混凝土短柱常温及火灾后的承载力与破坏形态。重点分析了试件的钢纤维掺量、含钢率及受火条件等因素对钢纤维增强陶粒钢管混凝土短柱相关性能的影响。结果表明，钢纤维的掺人对提高常温下及火灾后钢管陶粒混凝土短柱的承载力均有一定作用，且与试件含钢率有关。在0、39kg／m^3、78kg／m^3及117kg／m^3等各个钢纤维掺量中，39ks／m^3的掺量使700℃受火条件下火灾后试件承载力的提高幅度最高，为11％；当钢纤维掺量大于39kg／m^3时，随着钢纤维掺量的增加，试件的承载力则出现下降。

英文摘要：

If some steel fibers are incorporated into lightweight aggregate concrete, development of micro cracks in core concrete of steel fiber reinforced lightweight concrete filled steel tubular columns can be inhibited and the mechanical performance of them can be improved. However, there is few research on the mechanical property of steel fiber reinforced lightweight concrete filled steel tubular columns after exposure to fire at home and abroad. In this study, a comparative study of mechanical behavior of fifteen unprotected steel fiber reinforced ceramiste concrete filled steel tubular short columns （ noted as SFRCC-STSC） after exposure to fire and one set of the columns not subjected to fire load were put forward through experimental investigation, and the post-fire bearing capacity and failure form of the specimens with different parameters were discussed. Effects of the factors such as incorporated mount of steel fibers, steel proportion and fire condition on the strength and the other performance of SFRCC-STSC was especially discussed. Results show that incomoration of steel fibers SFRCC-STSC after exposure to fire, which is related to steel ratio of the specimens. Incorporation of 39 kg/m^3 steel fibers is the best among incorporation of 39 kg/m^3 ,78 kg/m^3 and 117 gk/m^3 for enhancing bearing capacity the specimens after exposure to fire load at 700℃ and increment is 11%. It is shown that the bearing capacity the specimens will drop with increase of incorporated amount of steel fibers as it is larger than 39 kg/m^3.