不同腔体构造方钢管高强再生混凝土轴压性能  

Research on Axial Compressive Performance of Square High-strength RACFST with Different Cell Details

作　　者：曹万林[1] 郭瑞洁 秦嘉 王浩[1] 董宏英[1] 刘亦斌 CAO Wanlin;GUO Ruijie;QIN Jia;WANG Hao;DONG Hongying;LIU Yibin(Faculty of Architecture,Civil and Transportation Engineering,Beijing University of Technology,Beijing 100124,China)

机构地区：[1]北京工业大学城市建设学部,北京100124

出　　处：《结构工程师》2023年第4期104-115,共12页Structural Engineers

基　　金：国家自然科学基金项目(51878015);北京市博士后工作经费资助项目。

摘　　要：为研究底层钢管混凝土柱柱底区段受基础强约束的影响,进行了4个方钢管高强普通混凝土和4个方钢管高强再生混凝土墩状试件的轴压试验。钢管腔体构造分为空腔体、内置钢筋笼和栓钉、内置竖向肋板、内置分腔钢板;混凝土分为C60普通混凝土、RC60再生粗骨料混凝土。研究了各试件的破坏过程、荷载-位移曲线、承载力、延性、耗能能力和应变。试验表明:腔体内置钢筋笼、焊接栓钉、内置竖向肋板、内置分腔钢板对提高试件承载力和延性均有显著作用;相同腔体构造的方钢管高强普通混凝土试件和方钢管高强再生混凝土试件轴压性能接近。考虑基础对钢管混凝土柱柱底区段强约束的钢管混凝土墩状试件受压承载力大于相同构造的钢管混凝土柱受压承载力,提出了承载力影响系数,墩状试件承载力为柱状试件承载力乘以承载力影响系数。对试件轴压性能进行了有限元模拟,有限元模拟结果与试验符合较好。In order to investigate the influence of the strong confinement provided by the foundation to the bottom section of the concrete-filled steel tubular(CFST)column on the ground floor of the building,axial compressive tests on four square high-strength ordinary CFST and four square high-strength recycled coarse aggregate concrete-filled steel tubular(RACFST)pier specimens were conducted.Steel tube cell details were divided into hollow steel tube,built-in reinforcement cage and studs,built-in vertical stiffeners,built-in cavity steel plates,and concrete was divided into C60 ordinary concrete,RC60 recycled coarse aggregate concrete.The failure process,load-displacement curves,bearing capacity,ductility,energy dissipation capacity and strain of each specimen were studied.The test results indicated that the built-in reinforcement cage and studs,vertical stiffeners,and cavity steel plates can significantly improve the bearing capacity and ductility of the specimens;the axial compressive performances of the square high-strength RACFST and CFST specimens with the same cell detail were similar.Considering the axial compressive bearing capacity of the CFST pier specimen with the strong confinement provided by the foundation to the bottom section of the CFST column was larger than that of the CFST column with the same cell detail,the bearing capacity influence coefficient was proposed,the bearing capacity of the pier specimen was the bearing capacity of the column specimen multiplied by the bearing capacity influence coefficient.The finite element simulation of the axial compressive performance of the specimens was carried out,and the finite element simulation results were in good agreement with the test results.

关 键 词：方钢管再生混凝土 钢管腔体构造 墩状试件 轴压试验 有限元分析 

分 类 号：TU398.9[建筑科学—结构工程]