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工程科学与技术:2021,53(3):62-67
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考虑钢-砼接触特征的CFST管节点热点应力分析
(西南交通大学 土木工程学院,四川 成都 610031)
Hot Spot Stress Analysis of CFST Joints Considering Steel-Concrete Contact Characteristics
(School of Civil Eng., Southwest Jiaotong Univ., Chengdu 610031, China)
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投稿时间:2020-05-12    修订日期:2020-08-30
中文摘要: 为研究不同钢-砼界面接触特征下钢管混凝土桁架焊接管节点局部应力分布及热点应力集中系数,以钢管混凝土桁架Y型焊接管节点(主管与支管夹角θ=60°)为研究对象,利用ANSYS有限元软件,选择其Solid45、Mass21、Targe170和Conta173单元建立管节点有限元模型,引入非线性面-面接触关系模拟局部变形导致的钢管与内填混凝土之间发生的相互挤压或脱离,计算得到钢管与内填混凝土接触间隙、侵入深度、法向接触应力和切向摩擦应力等局部接触变形及应力状态。分析了3种摩擦系数下(0、0.35、0.60),主管及支管的热点应力集中系数(HSCF)分布。研究结果表明:主管焊趾处热点应力HSCF在冠跟处出现最小值,在鞍点和冠趾之间的中点出现最大值;与主管相比,支管HSCF总体较小,冠跟处出现最小值,鞍点和冠趾之间出现最大值。支管轴向拉力作用下,Y型管节点焊缝附近钢、砼相互脱开,冠点附近比鞍点附近脱空区域大,鞍点脱空区域外围是钢管和混凝土接触挤压最剧烈区域,接触法向压力最大,混凝土对钢管支撑作用最明显。摩擦系数对管节点热点应力集中系数分布趋势影响很小,对HSCF最大值有一定影响。
Abstract:In order to investigate the local stress distribution and hot spot stress concentration factors (HSCF) of welded tubular joints of concrete-filled steel tube (CFST) truss under different contact characteristics of steel-concrete interfaces, the Y-shaped welded tubular joints of CFST truss (the angle between the chord and the branch was 60°) were set as the research object. Utilizing the finite element software ANSYS, a finite element model of the tubular joint was established by using Solid45, Mass21, Targe170 and Conta173 elements. Considering nonlinear surface-surface contact relationship between the steel tubular wall and the filled concrete, internal squeezing or detachment caused by local deformation were simulated. Local contact deformation and stress state such as the contact gap, penetration depth, normal contact stress and tangential friction stress between the steel tubular and the filled concrete were obtained. The HSCF distributions of the chord and branch under three friction coefficients (0, 0.35, 0.60) were analyzed. The research results showed that the HSCF at the weld toe of the chord had a minimum value at the crown heel and a maximum value at the midpoint between the saddle point and the crown toe. Compared with the chord, the HSCF of the branch was generally smaller and the minimum value appeared at the crown heel. The maximum appeared between the saddle point and the crown toe. Under the action of the axial tension of the branch, the steel and concrete near the welding seam of the Y-shaped tubular joint were separated from each other, and the void area near the crown point was larger than that near the saddle point. The periphery of the void area of the saddle point was the most violent contact and compression area between the steel tubular and the concrete. The pressure was the greatest, and the concrete showed the most obvious supporting effect on steel tube. The friction coefficient had little effect on the distribution trend of the HSCF of tubular joint, and had a certain effect on the maximum value of HSCF.
文章编号:202000386     中图分类号:U448.38    文献标志码:
基金项目:国家自然科学基金项目(52078424)
作者简介:第一作者:卫星(1976-),男,教授,博士.研究方向:钢结构与组合结构桥梁.E-mail:we_star@swjtu.cn;通信作者:肖林,E-mail:xiaolinglly@163.com
引用文本:
卫星,吴琛泰,肖林,李俊.考虑钢-砼接触特征的CFST管节点热点应力分析[J].工程科学与技术,2021,53(3):62-67.
WEI Xing,WU Chentai,XIAO Lin,LI Jun.Hot Spot Stress Analysis of CFST Joints Considering Steel-Concrete Contact Characteristics[J].Advanced Engineering Sciences,2021,53(3):62-67.