冷弯方钢管混凝土轴拉力学性能研究
引用文献：
高华国 ，张令心 ，焦晨星， 王庆利. 冷弯方钢管混凝土轴拉力学性能研究[J]. 建筑结构，2022，48（13）：86-93，68.
GAO Huaguo ，ZHANG Lingxin ，JIAO Chenxing ，WANG Qingli. Study on mechanical properties of cold-formed concrete-filled square steel tube under axial tension[J]. Building Structure，2022,48（13）：86-93，68.
摘要：以混凝土强度、截面宽厚比和是否填充混凝土为参数，进行了5个冷弯方钢管混凝土试件和1个冷弯方钢管试件的轴心受拉性能试验。使用ABAQUS软件对试件进行了有限元模拟，模拟的荷载-应变曲线与试验结果吻合较好。对混凝土的开裂点、钢管与混凝土的拉力分配、承载力的提高程度和工作机理等方面进行了研究。结果表明：随宽厚比的增大，试件的断裂应变呈减小的趋势；试件破坏位置集中在跨中和距加载端1/3试件高度处，断面呈水平方向或与中截面呈45°;在试件中截面测点的纵向应变为150με左右时，核心混凝土开裂，试件刚度出现折减；宽厚比在15～240的范围内，混凝土的填充对钢管的轴拉承载力提高幅度在3.03%～30.75%。基于参数分析拟合出了冷弯方钢管混凝土的轴拉承载力公式。
关键词：冷弯方钢管混凝土；轴心受拉；承载力；宽厚比；有限元模拟；工作机理
基金：辽宁省兴辽英才计划(XLYC1902009)；黑龙江省头雁行动计划;中国地震局工程力学研究所基本科研业务费专项资助重点项目(2019A01)。
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[7] 蔡文哲，史庆轩，王斌.钢管混凝土构件轴向受拉机理和承载力研究[J].地震工程与工程振动，2018,38(4):124-131.
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[9] Steel concrete and composite bridges part5:code of practice for design of composite bridges:BS 5400—2005[S].London:British Standards Institution,2005.
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[12] 钢管混凝土结构技术规程：DBJ/T 13-51—2003[S].福州：福建省住房和城乡建设厅，2003.
[13] ADBEL RAHMAN N,SIVAKUMARAN K.Material properties models for analysis of cold-formed steel members[J].Journal of Structural Engineering,1997,123(9):1135-1143.
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[15] RANMUSSEN K J R,HANCOCK G J.Design of cold-formed stainless steel tubular members Ⅱ:beams[J].Journal of Structure Engineering,1993,119(8):68-86.
[16] TAO Z,WANG Z B,YU Q.Finite element modelling of concrete-filled steel stub columns under axial compression[J].Journal of Constructional Steel Reasearch,2013,89:121-131.
[17] 廖栩，李吉人，王庆利.轴压荷载下中空夹层钢管混凝土抗扭性能试验研究[J].建筑结构，2022,52(6):90-96,125.
Study on mechanical properties of cold-formed concrete-filled square steel tube under axial tension
Abstract: Taking concrete strength, cross-section width-thickness ratio and concrete filling or not as parameters, five cold-formed concrete-filled square steel tube specimens and one cold-formed square steel pipe specimen were tested in axial tension. The finite element simulation of the specimens was carried out using ABAQUS software, and the simulated load-strain curve was in good agreement with the test results. The cracking point of concrete, the distribution of tensile force between steel tube and concrete, the improvement degree of bearing capacity and working mechanism were studied. The results show that with the increase of the width-thickness ratio, the fracture strain of the specimen shows a decreasing trend; the failure position of the specimen is concentrated in the middle of the span and 1/3 of the height of the specimen from the loading end, and the section is in the horizontal direction or at 45° to the mid-section; when the longitudinal micro-strain of the cross-section measurement point in the specimen is about 150με, the core concrete cracks and the stiffness of the specimen is reduced; the width-thickness ratio is in the range of 15～240, and the filling of concrete affects the axial tension of the steel pipe, the increase in bearing capacity is 3.03%～30.75%. Based on the parameter analysis, the formula for the axial tensile bearing capacity of the cold-formed concrete filled square steel tube was fitted.
Keywords: cold-formed concrete-filled square steel tube; axial tension; bearing capacity; width-thickness ratio; finite element simulation; working mechanism
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