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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,钢纤维的掺入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、39 kg/m3、78 kg/m3及117 kg/m3等各个钢纤维掺量中,39 kg/m3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39 kg/m3时,随着钢纤维掺量的增加,试件的承载力则出现下降。
The incorporation of a certain amount of steel fiber in lightweight aggregate concrete can effectively inhibit the development of microcracks in core concrete and improve the mechanical properties of lightweight aggregate concrete filled steel tubular columns. However, at home and abroad, the mechanical properties of steel fiber reinforced lightweight aggregate concrete filled steel tubular columns after fire are still lacking. Through comparative experiments on the mechanical properties of 15 concrete-filled steel tubular short columns reinforced with steel fiber reinforced with 15 un-hardened and 3 un-hardened steel, the effects of different temperatures and pressures Strength and destruction form. The effects of steel fiber content, steel content and fire conditions on the properties of steel fiber reinforced ceramic fiber reinforced concrete short columns were analyzed emphatically. The results show that the incorporation of steel fiber can improve the bearing capacity of concrete-filled steel tubular short columns under normal temperature and after fire, and it is related to the steel content of the specimens. Among the various steel fiber contents such as 0, 39 kg / m3, 78 kg / m3 and 117 kg / m3, the content of 39 kg / m3 increased the maximum increase of bearing capacity of the specimen after fire at 700 ℃ under fire, Is 11%. When the steel fiber content is more than 39 kg / m3, the load-bearing capacity decreases with the increase of steel fiber content.