摘要
以膨胀剂掺量为参数,对微膨胀钢管混凝土试件进行膨胀性能和极限承载力的试验研究.试验结果表明,混凝土由于膨胀剂的加入,补偿收缩效果明显,能够产生自应力防止脱空现象的发生;同时在钢管的紧箍力下,核心混凝土处于3向受压状态,能与钢管协同工作,从而提高钢管混凝土构件的极限承载力.通过对理论计算值和试验实测值的比较,钢管膨胀混凝土承载力不宜用钢管混凝土承载力公式进行计算,容易造成材料浪费.
Taking mixture ratio of expansive agent as a parameter, the expansive ability and limit bearing capacity of slightly expansible concrete-filled steel tube was experimentally investigated. The experiment result showed that the effect of compensation for concrete contraction was obvious due to the addition of expansive agent and the formation of self-stress, so that the vacating phenomenon was evaded. Meantime, the kernel concrete was in the state of triaxial compression due to the hooping steel tube and it could work incorporately with the steel tube so that the limit bearing capacity of this combined component was im- proved. Comparing the theoretic value with the experimental result, the formula of concrete-filled steel tube was not suitable for computation of bearing capacity of expansible concrete-filled steel tube, because it would lead to material waste.
出处
《兰州理工大学学报》
CAS
北大核心
2009年第5期107-111,共5页
Journal of Lanzhou University of Technology
基金
国家自然科学基金(50678078)
关键词
微膨胀钢管混凝土
膨胀性能
极限承载力
试验研究
expansible concrete-filled steel tube
expansive ability
limit bearing capacity
experimental research
