六边形钢管混凝土双向偏压柱的力学性能研究
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摘要
对六边形钢管混凝土柱在双向偏压荷载作用下的力学性能进行研究。在确定钢和混凝土本构模型基础上,运用有限元软件ABAQUS模拟典型六边形钢管混凝土双向偏压构件的荷载-变形曲线,开展工作机理分析和参数分析。机理分析表明:在双向偏压荷载作用下,六边形钢管混凝土柱表现出较高的极限承载力和延性;钢管对混凝土可起到有效约束作用,角部区钢管对混凝土的约束效果高于平直段钢管。参数分析表明:在小轴压比情况下,六边形钢管混凝土双向偏压构件的弯矩相关曲线呈1/4圆形;否则呈1/4椭圆形。最后提出该类双向偏压构件承载力的简化计算式。与有限元计算结果对比,简化计算结果偏于保守,可供工程设计参考。
The mechanical properties of hexagonal concrete-filled steel tubular( HCFST) columns under biaxial eccentric compression were carried out. After models of the steel and core concrete were verified,the finite element( FE) software ABAQUS was used to simulate the load-deformation curve of HCFST columns under biaxial eccentric compressions. Meanwhile,the working mechanism and parametric analysis were carried out. The mechanic analysis showed that HCFST columns under the biaxial eccentric compression exhibited high strength and ductility. The steel tube could effectively confine core concrete. In corner regions,the confinement of the steel tube was higher than that in straight-line segments. The parametric analysis showed that for HCFST columns with small axial load ratio,the shape of bending moment curves of HCFST columns subjected to biaxial eccentric compression was quarter-circle.Otherwise,the shape of bending moment curves was quarter-ellipse. Finally,simplified formulas for predicting the strength of HCFST columns under biaxial eccentric compressions were proposed. Compared with the FE results,the results predicted by simplified formulas were conservative,which could be used for engineering design.
The mechanical properties of hexagonal concrete-filled steel tubular( HCFST) columns under biaxial eccentric compression were carried out. After models of the steel and core concrete were verified,the finite element( FE) software ABAQUS was used to simulate the load-deformation curve of HCFST columns under biaxial eccentric compressions. Meanwhile,the working mechanism and parametric analysis were carried out. The mechanic analysis showed that HCFST columns under the biaxial eccentric compression exhibited high strength and ductility. The steel tube could effectively confine core concrete. In corner regions,the confinement of the steel tube was higher than that in straight-line segments. The parametric analysis showed that for HCFST columns with small axial load ratio,the shape of bending moment curves of HCFST columns subjected to biaxial eccentric compression was quarter-circle.Otherwise,the shape of bending moment curves was quarter-ellipse. Finally,simplified formulas for predicting the strength of HCFST columns under biaxial eccentric compressions were proposed. Compared with the FE results,the results predicted by simplified formulas were conservative,which could be used for engineering design.
引文
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[6]曹万林,武海鹏,张建伟,等.轴压及轴拉作用下异形截面多腔钢管混凝土巨型柱抗震性能试验研究[J].建筑结构学报,2015,36(增刊1):199-206.
[7]ZHANG Y B,HAN L H,ZHOU K,et al.Mechanical Performance of Hexagonal Multi-Cell Concrete-Filled Steel Tubular(CFST)Stub Columns Under Axial Compression[J].Thin-Walled Structures,2019,134:71-83.
[2]XU W,HAN L H,LI W.Performance of Hexagonal CFSTMembers Under Axial Compression and Bending[J].Journal of Constructional Steel Research,2016,123:162-175.
[3]XU W,HAN L H,LI W.Seismic Performance of ConcreteEncased Column Base for Hexagonal Concrete-Filled Steel Tube:Experimental Study[J].Journal of Constructional Steel Research,2016,121:352-369.
[4]HAN L H,HOU C C,XU W.Seismic Performance of ConcreteEncased Column Base for Hexagonal Concrete-Filled Steel Tube:Numerical Study[J].Journal of Constructional Steel Research,2018,149:225-238.
[5]郭俊涛.六边形钢管混凝土柱偏压力学性能研究[D].福州:福州大学,2017.
[6]曹万林,武海鹏,张建伟,等.轴压及轴拉作用下异形截面多腔钢管混凝土巨型柱抗震性能试验研究[J].建筑结构学报,2015,36(增刊1):199-206.
[7]ZHANG Y B,HAN L H,ZHOU K,et al.Mechanical Performance of Hexagonal Multi-Cell Concrete-Filled Steel Tubular(CFST)Stub Columns Under Axial Compression[J].Thin-Walled Structures,2019,134:71-83.