摘要
通过改变圆钢管混凝土短柱的宽厚比和膨胀剂掺量,即混凝土膨胀剂掺量为0%、4%、6%、8%,圆形钢管外径为200 mm、250 mm,制作10个试件,分为A、B两组,对其进行轴压试验,观察其破坏形态,得到了不同宽厚比及膨胀剂掺量下的σ-ε曲线和极限承载力。研究结果表明,管内混凝土中的膨胀剂掺量为4%、6%和8%的圆钢管混凝土柱的轴压极限承载力相比于普通圆钢管混凝土柱的极限承载力,A组分别提高46.88%、35.56%和13.73%,B组分别提高53.13%、41.58%、20.08%。采用ABAQUS非线性有限元软件模拟分析,与试验结果模拟较为吻合。因此,当管内混凝土中的膨胀剂掺量在4%时,圆钢管混凝土柱的极限承载力提高幅度最大,性能最优。
By changing the aspect ratio of the circular steel tube concrete short column and the amount of expansion agent used,the concrete expansion agent usage was 0%,4%,6%,8%,and the diameter of the circular steel pipe was 200 mm,250 mm,and 10 test members were fabricated.It is divided into two groups,A and B.The axial compression test was carried out on the test components,and the failure mode was observed.The stress-strain curves and ultimate bearing capacity of different width-thickness ratios and expansion agent dosages were obtained.The results showed that compared with the ordinary round concrete-filled steel tubular columns,the maximum bearing capacity of the axial compression of Group A was increased by 46.88%,35.56%and 13.73%,respectively,and that of Group B was increased by 53.13%,41.58%and 20.08%,respectively.The simulation results of ABAQUS nonlinear finite element software were used,and the experimental results were basically the same as the simulated values.Therefore,when the amount of expansion agent used in concrete was 4%,the maximum bearing capacity of the circular steel tubular concrete column was maximized and the performance was optimal.
作者
丁新东
曹新明
DING Xindong;CAO Xinming(College of Civil Engineering,Guizhou University,Guiyang 550025;Key Laboratory of Structural Engineering,Guizhou Provincial,Guiyang 550025)
出处
《材料导报》
EI
CAS
CSCD
北大核心
2019年第S02期327-330,342,共5页
Materials Reports
基金
国家自然科学基金青年科学基金项目(11602061)
贵州省科技计划基金项目([2018]2816)~~
关键词
膨胀剂
圆钢管混凝土
轴心抗压试验
承载力
有限元分析
expansion additive
circular steel tube concrete
axial compression test
bearing capacity
finite element analysis
