摘要
在满足承载力要求的前提下,薄壁钢管约束陶粒混凝土可进一步减轻构件自重,节省用钢量.为研究其偏心受压性能,以陶粒混凝土强度等级、钢管壁厚、偏心距为变化参数,对12根薄壁钢管约束陶粒混凝土短柱进行单调静力加载试验,观测其破坏形态、承载力、侧向挠度、钢管应变.试验结果表明:所有试件均为弹塑性破坏,钢管屈服,具有良好的延性;随偏心距的增大,试件的极限承载力降低;增大钢管壁厚可有效提高试件的延性和极限承载力;随陶粒混凝土强度的增大,试件的极限承载力增大,但延性降低;钢管壁厚与陶粒混凝土强度等级存在匹配性;薄壁钢管约束可大幅提高陶粒混凝土短柱的偏压承载力.基于试验结果,以中、美、英相关规范的公式估算各试件的偏压承载力,发现CECS 28:2012《钢管混凝土结构技术规程》的误差最小,建议作为薄壁钢管约束陶粒混凝土柱压弯承载力的预测公式.
When bearing capacity requirements are met,ceramsite concrete filled thin-walled steel tube can further reduce the weight of components and save steel consumption.In order to investigate its eccentric compressive behavior,12 ceramsite concrete filled thin-walled circular steel tube short columns are tested by monotonic static loading,considering ceramsite concrete strength grade,initial eccentricity and steel tube wall thickness as variable parameters.Failure modes,bearing capacity,lateral deflection and steel tube strains are recorded.The test results indicate that all specimens fail in elastic-plastic mode with yielding of thin-walled steel tube and show good ductility;ultimate bearing capacities of specimens decreases with the increase of initial eccentricity.Increasing the thickness of steel tube wall can effectively improve the ductility and ultimate bearing capacity.With the increase of the strength grade of ceramsite concrete,the ultimate bearing capacity increases,but the ductility decreases.The wall thickness of steel tube should match the strength grade of ceramsite concrete.The confinement of thin-walled steel tubes can greatly improve the eccentrical bearing capacity of ceramsite concrete short columns.Based on the test data,the eccentric bearing capacities of the specimens are estimated according to the relevant codes of China,USA and UK.It is found that the calculated bearing capacities of the Chinese code CECS 28:2012 Technical Specification for Concrete-filled Steel Tubular Structures are most closed to the test ones.Thus this code can be recommended to predict the compression-bending capacity of ceramsite concrete filled thin-walled circular steel tube column.
作者
郑宏宇
孟淼
朱振
柯晓军
郑煜缤
郑峻
ZHENG Hongyu;MENG Miao;ZHU Zhen;KE Xiaojun;ZHENG Yubin;ZHENG Jun(Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,School of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Design and Research Institute of No.5 Construction Engineering Co.,Ltd.,Guangxi Construction Engineering Group,Nanning 530001,China)
出处
《湖南科技大学学报（自然科学版）》
CAS
北大核心
2024年第3期61-69,共9页
Journal of Hunan University of Science And Technology：Natural Science Edition
基金
国家自然科学基金资助项目(51508112)
广西自然科学基金资助项目(2018GXNSFAA050007)。
关键词
薄壁钢管
陶粒混凝土
短柱
偏心受压
承载力
延性
thin-walled steel tube
ceramsite concrete
short column
eccentric compression
bearing capacity
ductility
