摘要
采用有限元软件ABAQUS对圆端形钢管混凝土柱局压力学性能及受力机理进行数值模拟,对试件受力全过程、接触力及参数进行分析。结果表明:同一截面钢管圆弧段相比平直段约束作用更强,接触力更大,且自端部向下,截面各点处的接触力逐渐减小;当局压面积比由1.44分别增大至4、9、16时,圆端形钢管混凝土柱局压承载力分别降低33.6%、54.7%、66.1%;钢管屈服强度由235 MPa增加至345、390、420 MPa时,试件刚度无明显变化,局压承载力分别提高33.7%、47.3%、56.4%;当混凝土立方体抗压强度由30 MPa分别增加至35、40、45、50 MPa时,试件刚度逐渐增大,局压承载力分别提高2.2%、4.1%、6.4%、11.2%;含钢率由0.05增加至0.1、0.15、0.2时,试件刚度增大,局压承载力分别提高57.7%、114.6%、165.3%。
A numerical simulation of the local compressive mechanical properties and force mecha-nism of concrete-filled steel tubular(CFST)columns with rounded ends was conducted using the finite element software ABAQUS.The entire loading process,contact forces,and relevant parame-ters of the specimens were analyzed.The results indicate that,within the same cross-section,the cir-cular arc segment of the steel tube provides stronger confinement and experiences greater contact forces compared to the straight segment.Moreover,the contact forces gradually decrease from the end downwards along the column.When the local compressive area ratio increases from 1.44 to 4,9,and 16,the local compressive bearing capacity of the CFST columns with rounded ends decreases by 33.6%,54.7%,and 66.1%,respectively.As the yield strength of the steel tube increases from 235 MPa to 345,390,and 420 MPa,there is no significant change in the stiffness of the specimens,but the local compressive bearing capacity increases by 33.7%,47.3%,and 56.4%,respectively.When the compressive strength of the concrete cube increases from 30 MPa to 35,40,45,and 50 MPa,the stiffness of the specimens gradually increases,and the local compressive bearing capac-ity improves by 2.2%,4.1%,6.4%,and 11.2%,respectively.As the steel ratio increases from 0.05 to 0.1,0.15,and 0.2,the stiffness of the specimens increases,and the local compressive bear-ing capacity enhances by 57.7%,114.6%,and 165.3%,respectively.
作者
刘华东
汤永强
LIU Huadong;TANG Yongqiang(Guangdong Yuehai Yuedong Water Supply Co,Ltd,Jieyang 522000,China;Shenyang Jianzhu University,Shenyang 110168,China)
出处
《沈阳理工大学学报》
2025年第5期74-81,共8页
Journal of Shenyang Ligong University
基金
辽宁省教育厅高等学校基本科研项目(JYTMS20231591)。
关键词
圆端形钢管混凝土柱
局压性能
有限元分析
接触应力
参数分析
circular-ended concrete-filled steel tubular columns
local compression performance
fi-nite element analysis
contact stress
parametric analysis
