铝合金管约束钢筋混凝土柱轴压性能研究  

Study on axial compressive behavior of aluminum alloy tube confined reinforced concrete

作　　者：王景玄[1,2] 刘芳玲 王文达 WANG Jingxuan;LIU Fangling;WANG Wenda(School of Civil Engineering,Lanzhou University of Technology,Lanzhou 730050,China;Western Center of Disaster Mitigation in Civil Engineering of Ministry of Education,Lanzhou University of Technology,Lanzhou 730050,China)

机构地区：[1]兰州理工大学土木工程学院,甘肃兰州730050 [2]兰州理工大学西部土木工程防灾减灾教育部工程研究中心,甘肃兰州730050

出　　处：《建筑结构学报》2025年第4期210-222,共13页Journal of Building Structures

基　　金：国家自然科学基金项目(52368021,52068047);甘肃省基础研究创新群体(24JRRA169);甘肃省委组织部青年人才项目。

摘　　要：为研究铝合金管约束钢筋混凝土柱的轴压性能,对18根方形和圆形截面轴压短柱开展轴压试验,包括12根铝合金管约束钢筋混凝土,2根铝合金管混凝土和4根铝合金管约束混凝土对比柱。结果表明:圆形截面柱破坏时铝合金管和核心混凝土呈现剪切破坏,而方形截面柱表现为铝合金管角部的屈曲和撕裂;相同截面尺寸的短柱,铝合金管厚度从2.5 mm增加到3.5 mm,轴压承载力提高1.5%~6.5%,耗能提高23.8%~167.7%,且圆形截面柱比方形截面柱具有更好的延性和更高的承载力。此外,对比了方形和圆形截面铝合金管对核心混凝土的横向约束效应,发现受力初期圆形截面铝合金管对核心混凝土更早发挥约束作用,且加载后期表现出更好的约束效果。计算了两种截面短柱的等效约束应力,计算与试验结果吻合良好。同时,针对方形截面试件铝合金管角部易撕裂而影响延性的问题,给出构造措施建议。To study the axial compressive behavior of aluminum alloy tube confined reinforced concrete columns,axial compression tests were conducted on 18 short columns with square and circular cross-sections.The test program included 12 aluminum alloy tube confined reinforced concrete columns,two concrete-filled aluminum alloy tube columns and four aluminum alloy tube confined concrete columns as comparison specimens.The results indicate that during the failure process,the aluminum alloy tube and the core concrete of the circular cross-sectional columns exhibit shear failure mode,while the square cross-sectional specimens demonstrate buckling and tearing at the corners of the aluminum alloy tubes.For specimens with the same cross-sectional dimension,as the thickness of the aluminum alloy tube increases from 2.5 mm to 3.5 mm,the axial compression capacity is increased by 1.5%to 6.5%,and the energy dissipation is increased by 23.8%to 167.7%.Circular cross-sectional columns exhibit better ductility and higher compressive capacity than those of the square cross-sectional columns.Additionally,the transverse confinement effect on the core concrete was studied and compared considering different cross sections.It is found that the circular cross-sectional columns exert an earlier and more effective confinement on the core concrete than the square cross-sectional columns at the initial and late stage of loading.The equivalent confining stress for both types of cross-sectional specimens was calculated.The calculated results show good agreement with the test results.Meanwhile,detailing measures were suggested to improve the effect of the corner tearing of square aluminum alloy tube on ductility.

关 键 词：铝合金管 约束混凝土 轴压试验 约束机理 等效约束应力 

分 类 号：TU398.9[建筑科学—结构工程] TU317.1