铁道科学与工程学报2018，Vol.15Issue(5)：1262-1270,9.
排气孔对方钢管混凝土短柱耐火性能影响试验研究
Experimental study of vent holes influence on fire resistance of square CFT columns under high temperature
摘要
Abstract
In order to investigate the influence of vent hole numbers on fire resistance of square concrete-filled steel tubular (CFT) columns, the tests of seven square CFT columns subjected to axial loads under high temperature were conducted. The influence of axial load level, number of exhaust vent and steel ratio on exposure time-axial deformation curves and fire resistance time of the square CFT column were studied. The test results show that vent holes have influence on the local buckling position of specimens. As the number of vent holes increased, the fire resistance of the square CFT column reduced as well as the rate of compressive deformation of axial deformation-exposure time curves became faster. As the value of axial load level increased, the fire resistance of the square CFT column reduced, yet the creep phase of exposure time-axial deformation curves became unobvious. As the value of steel ratio increased, the fire resistance time of the square CFT column reduced. The damage mechanism of concrete under high temperature was obtained to study the number of vent holes which have influence on fire resistance of square CFT. The achievements in this paper could afford a design approach for such typed structures.关键词
方钢管混凝土柱/耐火性能/排气孔数量Key words
square CFT columns/fire resistance/number of vent holes分类
建筑与水利引用本文复制引用
钟水溶,霍静思,王海涛,刘桂秋..排气孔对方钢管混凝土短柱耐火性能影响试验研究[J].铁道科学与工程学报,2018,15(5):1262-1270,9.基金项目
国家自然科学基金资助项目(51378200,50778069) （51378200,50778069）
教育部新世纪优秀人才计划资助项目(NCET–11–0123) （NCET–11–0123）
