超高性能混凝土研究综述

为研究圆形钢管含粗骨料超高性能混凝土(Ultra-high performance concrete with coarse aggregate filled steel tube, CA-UHPCFST)中长柱的偏心受压性能，考虑长径比和偏心距的影响，设计制作了7个圆形CA-UHPCFST中长柱试件，通过偏心受压试验，重点考察构件的破坏形态、荷载-变形关系曲线、侧向挠度分布曲线、荷载-应变关系曲线、延性和极限承载力。研究表明：圆形CA-UHPCFST中长柱在偏心受压下发生弯曲失稳破坏，其荷载-变形曲线经历了弹性段、弹塑性段和下降段；极限承载力随长径比和偏心距的增加而降低，延性系数随长径比的增加而减小，而随偏心距的增加呈先增加后减小的趋势。规范GB 50936−2014可较好地预测圆形CA-UHPCFST中长柱偏心受压极限承载力。研究成果可为钢管超高性能混凝土的进一步研究与推广应用提供参考。

Review of research on ultra-high performance concrete

To investigate the mechanical behavior of circular ultra-high performance concrete with coarse aggregate filled steel tube (CA-UHPCFST) slender columns under eccentric compression, 7 specimens were designed and fabricated with the consideration of slenderness ratio and eccentricity. Through eccentric compression tests, the failure modes, load-deformation curves, lateral deflection distributions, load-strain relationships, ductility and ultimate carrying capacity were analyzed. The results show that the CA-UHPCFST slender columns under eccentric compression demonstrate a buckling failure pattern, and the load-deformation curves consist of elastic, elastoplastic and descending stages. The ultimate carrying capacity of specimens is inverse proportional to the slenderness ratio and eccentricity, the ductility coefficient decreases with the slenderness ratio while increases first and then decreases with the eccentricity. The carrying capacity of specimens predicted by GB 50936−2014 is in good agreement with the experimental results. The research outcome can provide reference for further investigation and engineering application of UHPCFST members.