薄壁圆钢管约束陶粒混凝土短柱轴压性能研究  

Experimental study on axial compression behavior of ceramsite concrete filled thin-walled circular steel tube short column

作　　者：郑宏宇[1,2] 郑峻 柯晓军[1,2] 朱振 孟淼 郑煜缤 ZHENG Hong-yu;ZHENG Jun;KE Xiao-jun;ZHU Zhen;MENG Miao;ZHENG Yu-bin(College of Civil Engineering and Architecture,Guangxi University,Nanning 530004,China;Key Laboratory of Disaster Prevention and Structural Safety of Ministry of Education,Nanning 530004,China;Guangxi Construction Engineering Group No.5 Architectural Design and Research Institute Co.,Ltd.,Nanning 530001,China)

机构地区：[1]广西大学土木建筑工程学院,广西南宁530004 [2]工程防灾与结构安全教育部重点实验室,广西南宁530004 [3]广西建工集团第五建筑工程有限责任公司设计研究院,广西南宁530001

出　　处：《广西大学学报（自然科学版）》2022年第1期74-82,共9页Journal of Guangxi University（Natural Science Edition）

基　　金：国家自然科学基金项目(51508112),广西自然科学基金项目(2018GXNSFAA050007)。

摘　　要：为了研究薄壁圆钢管约束轻骨料混凝土柱的轴心受压性能,设计制作4根薄壁钢管约束陶粒混凝土短柱试件,以核心陶粒混凝土强度、钢管壁厚为变化参数,通过单调静力加载试验,测试其受力过程及破坏形态、位移、钢管应变,研究陶粒混凝土强度、套箍系数对承载力和变形能力的影响规律。结果表明,径厚比为80和125、套箍系数小于0.5的薄壁钢管陶粒混凝土柱的破坏特征相似,破坏后钢管出现多道环形褶皱,核心混凝土压碎;薄壁钢管对陶粒混凝土有较好的约束作用,柱子轴压承载力较无钢管约束柱平均提高50%;位移延性系数接近和超过3.0,延性良好;核心陶粒混凝土强度提高率、柱子的轴压延性与套箍系数成正比;柱子轴压承载力与钢管壁厚、核心陶粒混凝土强度等级成正比,但增大钢管壁厚更为有效。Four ceramsite concrete filled thin-walled steel tube(CCFTST)short column specimens are designed,fabricated and tested to study their axial compression behavior.Considering the strength of core ceramsite concrete and wall thickness of steel tube as the designed variations,the loading process,failure patterns,displacement,steel tube’s strain are measured during monotonic static loading test.The influence of core ceramsite concrete strength and confinement coefficient on bearing and deformation capacity is studied.The test results indicate:CCFTST columns with diameter-thickness ratio of 80 and 125,as well as confinement coefficient of lower than 0.5 have similar failure patterns,and several annular folds appear on steel tube surface and the core ceramsite concrete is crushed after failure.The thin-walled steel tube can provide good confinement effect on core ceramsite concrete,the compression bearing capacity of the columns are increased by 50% on average,compared with unconfined ones.The displacement ductility coefficient can reach and exceed 3.0,which shows satisfied ductility,and the increasing ratio of compressive strength of core ceramsite concrete and ductility of the columns are proportional to confinement coefficient.The axial bearing capacity of columns is proportional to wall thickness of steel tube and strength grade of core ceramsite concrete,but the increasing wall thickness is more effective.

关 键 词：薄壁钢管 轻骨料混凝土 陶粒 轴心受压 

分 类 号：TU398[建筑科学—结构工程] TU528.59