方钢管约束密实增强混凝土轴压短柱承载性能研究  

Performance study on bearing capacities of square steel tubular confined compact reinforced composite axial compression stub columns

作　　者：高春彦 樊荣 刘明洋 刘勇飞 GAO Chunyan;FAN Rong;LIU Mingyang;LIU Yongfei(School of Civil Engineering,Inner Mongolia University of Science and Technology,Inner Mongolia Baotou 014010,China;Sinosteel Equipment&Engineering Co.,Ltd.Baotou Branch,Inner Mongolia Baotou 014010,China;Shanghai Baoye Group Co.,Ltd.,Shanghai 201900,China;Baogang Northwest Venture Construction Co.,Ltd.,Inner Mongolia Baotou 014010,China)

机构地区：[1]内蒙古科技大学土木工程学院,内蒙古包头014010 [2]中钢设备有限公司包头分公司,内蒙古包头014010 [3]上海宝冶集团有限公司,上海201900 [4]包钢西北创业建设有限公司,内蒙古包头014010

出　　处：《西安建筑科技大学学报（自然科学版）》2023年第1期85-92,共8页Journal of Xi'an University of Architecture & Technology(Natural Science Edition)

基　　金：国家自然科学基金项目(51968058),内蒙古科技大学建筑科学研究所开放基金项目(JYSJJ-2021M01)。

摘　　要：以钢纤维体积掺量、套箍系数为变化参数,通过对非约束密实增强混凝土(CRC)和方钢管约束CRC棱柱体短柱进行轴向加载试验,研究了试件的破坏特征、荷载-变形关系、主要特征点指标等,揭示了各变化参数的影响规律.结果表明:方钢管约束CRC的破坏形态为钢管焊缝不同程度的撕裂破坏,焊缝撕裂范围内核心CRC被压碎,其破坏形态完全不同于非约束CRC的剪切型破坏.方钢管约束使得核心CRC轴压强度明显提高,纵向变形性能大大改善.套箍系数对试件轴压力学性能的影响最为显著,而钢纤维体积掺量对试件轴压强度和变形能力的影响较小.With the steel fiber volume content and confinement coefficient as variable parameters,the axial loading tests were completed on the unconfined compact reinforced composite(CRC)and the square steel tubular confined CRC prismatic stub columns,the failure characteristics,load-deformation relationships and the main characteristic point indexes of specimens were studied,and the influence laws of variable parameters were revealed.The experimental results show that the welds of steel tube were torn in various degree and the core CRC within the weld tearing range were crushed for the square steel tubular confined CRC specimens,whose failure mode are completely different from the shear failure of the unconfined CRC specimens.The axial compressive strength of core CRC significantly increases and the longitudinal deformation performance greatly improves due to the constraint of steel tube.The confinement coefficient has the most significant effect on the axial compression performance of the confined CRC,while the steel fiber volume content has little effect on the axial compressive strength and deformation capacity of confined CRC.

关 键 词：密实增强混凝土 钢纤维体积掺量 套箍系数 承载力 

分 类 号：TU398.9[建筑科学—结构工程]