程 高,张正琦,刘永健,等.界面状态对椭圆钢管混凝土轴压短柱影响分析[J].深圳大学学报理工版,2018,35(No.5(441-550)):444-452.[doi:10.3724/SP.J.1249.2018.05444]
CHENG Gao,ZHANG Zhengqi,LIU Yongjian,et al.The behaviors of concrete-filled elliptical hollow section steel stub columns under different interface states[J].Journal of Shenzhen University Science and Engineering,2018,35(No.5(441-550)):444-452.[doi:10.3724/SP.J.1249.2018.05444]
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界面状态对椭圆钢管混凝土轴压短柱影响分析
程 高1,2,3,张正琦1,刘永健1,2,3,孟俊苗1,2,3

1)长安大学公路学院,陕西西安 710064; 2)陕西省公路桥梁与隧道重点实验室,陕西西安 710064; 3)旧桥检测与加固技术交通行业重点实验室(西安),陕西西安 710064

桥梁工程; 钢管混凝土; 椭圆截面; 界面状态; 受荷方式; 短柱; 有限元分析

The behaviors of concrete-filled elliptical hollow section steel stub columns under different interface states
CHENG Gao1,2,3, ZHANG Zhengqi1, LIU Yongjian1,2,3, and MENG Junmiao1,2,3

1)School of Highway, Chang'an University, Xi'an 710064, Shaanxi Province, P.R.China2)Shaanxi Provincial Major Laboratory for Highway Bridge & Tunnel, Xi'an 710064, Shaanxi Province, P.R.China3)Key Laboratory of Bridge Detection Reinforcement Technology Ministry of Communications(Xi'an), Xi'an 710064, Shaanxi Province, P.R.China

bridge engineering; concrete-filled steel tube; elliptical hollow section; interface state; loading model; stub column; finite element analysis

DOI: 10.3724/SP.J.1249.2018.05444

备注

为分析界面状态对椭圆钢管混凝土轴压短柱力学性能的影响,构建了脱黏、有黏结滑移和完全黏结等3种典型界面状态的本构模型,并采用ABAQUS有限元软件进行数值模拟. 围绕椭圆钢管混凝土轴压构件在工程应用中可能出现的典型受荷方式,如钢管和混凝土共同受力、仅混凝土受力、仅钢管受力等,建立非线性有限元模型,分析界面状态对构件的钢-混界面法向压应力、钢管及混凝土截面压应力、极限承载力和轴压刚度等力学性能的影响规律. 结果表明,仅混凝土受力和仅钢管受力模式下,界面状态显著影响椭圆钢管混凝土轴压短柱的力学性能; 界面黏结作用越强,钢管和混凝土互相帮助分担荷载的能力就越强,构件抵抗变形的能力就越强; 钢管和混凝土共同受力模式下,界面状态对构件钢管和混凝土截面压应力、极限承载力及轴压刚度几乎无影响.

In order to analyze the influence of interface states on the mechanical properties of concrete-filled elliptical hollow section(EHS)steel stub columns subjected to axial compression, a constitutive model of three typical interface states, such as debonding, bonding slip and complete bonding, is constructed and numerically simulated by ABAQUS. In engineering applications, there are three typical load-bearing modes of elliptical-filled steel tubular concrete members, loading through the whole cross section, loading through steel only and loading through concrete only. Therefore, few nonlinear finite element models are established to analyze interfacial stress, sectional compressive stress, ultimate bearing capacity and axial stiffness. The results show that the mechanical behaviors of concrete-filled EHS steel stub columns loading through concrete only and loading through steel only are significantly affected by interface states. The stronger the interfacial bonding is, the more load the steel tube or concrete could share, and the stronger the ability of the members to resist deformation is. The interface state has no effect on mechanical behavior of concrete-filled EHS steel stub columns loading through the whole cross section of steel and concrete.

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