建筑结构学报2017，Vol.38Issue(4)：81-89,9.DOI:10.14006/j.jzjgxb.2017.04.010
方钢管钢筋混凝土轴压短柱高温后受力性能试验研究
Experimental study on axial mechanical behavior of reinforced concrete-filled square hollow section columns after exposure to high temperatures
摘要
Abstract
In order to research the effects of exposure time and reinforcement ratio on the residual load bearing capacity,stiffness and ductility of reinforced concrete-filled square hollow section (RCFSHS) columns,six specimens at ambient temperature and twelve specimens after exposure to fire were tested.For the tests with 30 minutes and 60 minutes exposure time,temperature distribution in typical sections of columns were measured at their heating stages.The test results show that when compared to the non-exposed tests,after 30 min exposure,for those columns with reinforcement ratios of 1.45％ and 3.26％,their residual load bearing capacity,axial compressive stiffness and ductility are respectively reduced by 13.4％ and 5.4％,20.8％ and 24.3％,31.9％ and 44.0％.Correspondingly,after 60 min exposure,the residual load bearing capacity,axial compressive stiffness and ductility are reduced by 23.3％ and 12.8％,37.5％ and 39.1％,52.5％ and 61.5％,respectively.Based on the experimental statistics and Code GB 50936-2014,a design formula was proposed for predicting the residual axial load bearing capacity of RCFSHS columns after exposure to fire.It is shown that the calculated results predicted by the proposed formula agree well with the experiment results.关键词
方钢管钢筋混凝土柱/高温试验/轴压试验/静力性能Key words
reinforced concrete-filled square hollow section column/high temperature test/axial compression experiment/static behavior分类
建筑与水利引用本文复制引用
张玉琢,吕学涛,杨华,王微微..方钢管钢筋混凝土轴压短柱高温后受力性能试验研究[J].建筑结构学报,2017,38(4):81-89,9.基金项目
国家自然科学基金项目(51208246,51278153). （51208246,51278153）
