塑料内管的方中空夹层钢管混凝土柱轴压性能研究
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摘要
为了研究塑料制品代替钢管作为方中空夹层钢管混凝土中的内管对其轴压性能的影响,设计了内管为PVC管、PPR管、圆钢管的方中空夹层钢管混凝土试件共5根,对所有试件进行了轴压试验;并分析了其整体、核心混凝土、内管的破坏形态、荷载-纵向应变关系曲线及组合弹性模量,试件的轴压全过程运用有限元软件ABAQUS模拟。结果表明:PVC管受到压力时呈脆裂破坏,而PPR管和圆钢管有较好的抵抗塑性变形的能力;按极限承载力和组合弹性模量由大到小的排列是:钢内管试件,PPR内管试件,PVC内管试件;有限元模型能够较好地模拟所有试件的前期刚度和钢内管试件的极限承载力;PVC管和PPR管在轴压全过程中承担的轴向荷载及其与混凝土的相互作用几乎为零。
Five square concrete-filled double skin steel tubes(SCFDST) were made to investigate the impact of using plastic instead of steel as inner tube on axial compression mechanics behavior of SCFDST, three types of inner tube were included, i. e., steel tube, PVC tube and PPR tube. All specimens were under axial compression, the failure modes about whole and internal, N-ε curves and composite elastic modulus have been analyzed. The whole process of axial compression of 5 specimens were simulated by the finite element method(FEM) software ABAQUS. The results show that, PVC tube show its brittleness under pressure, but PPR tube and steel tube have good capacity to resist the plastic deformation. The sequence is inner steel tube specimen, PPR tube specimen and PVC tube specimen according to the ultimate bearing capacity and composite elastic modulus order. Stiffness in earlier stage of all specimens and the ultimate bearing capacity of SCFDST with steel tube calculated by FEM model are in good agreement with those measured by experiment. PVC tube and PPR tube only undertake little axial load in the whole process compared with steel tube, and the interaction with sandwich concrete is negligible.
Five square concrete-filled double skin steel tubes(SCFDST) were made to investigate the impact of using plastic instead of steel as inner tube on axial compression mechanics behavior of SCFDST, three types of inner tube were included, i. e., steel tube, PVC tube and PPR tube. All specimens were under axial compression, the failure modes about whole and internal, N-ε curves and composite elastic modulus have been analyzed. The whole process of axial compression of 5 specimens were simulated by the finite element method(FEM) software ABAQUS. The results show that, PVC tube show its brittleness under pressure, but PPR tube and steel tube have good capacity to resist the plastic deformation. The sequence is inner steel tube specimen, PPR tube specimen and PVC tube specimen according to the ultimate bearing capacity and composite elastic modulus order. Stiffness in earlier stage of all specimens and the ultimate bearing capacity of SCFDST with steel tube calculated by FEM model are in good agreement with those measured by experiment. PVC tube and PPR tube only undertake little axial load in the whole process compared with steel tube, and the interaction with sandwich concrete is negligible.
引文
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[13]Jiang S,Ma S,Liang C,et al.Axial behavior of CFRP-PVC-confined concrete stubs[J].Advanced Science Letters,2012,9(1):197-203.
[14]姜绍飞,冯义雄,吴兆旗,等.CFRP-PVC管混凝土压弯构件约束机理研究[J].哈尔滨工业大学学报,2011,43(增刊2):33-37.(Jiang Shaofei,Feng Yixiong,Wu Zhaoqi,et al.Study on the confining mechanism of concrete confined by CFRP-PVC tubes under axial load and bending moment[J].Journal of Harbin Institute of Technology,2011,43(S2):33-37(in Chinese)).
[2]Hassanein M F,Kharoob O F,Gardner L.Behaviour and design of square concrete-filled double skin tubular columns with inner circular tubes[J].Engineering Structures,2015,100:410-424.
[3]郭立湘,李婷,杨建,等.方中空夹层钢管混凝土压扭构件的试验及有限元计算研究[J].工业建筑,2015,45(7):148-152.(Guo Lixiang,Li Ting,Yang Jian,et al.Experiment and finite-element calculation study on concrete-filled double skin steel tubular members under compression and torsion[J].Industrial Construction,2015,45(7):148-152(in Chinese)).
[4]Yang Youfu,Hou Chao,Meng Chunyuan,et al.Investigation on square concrete filled double-skin steel tube(CFDST)subjected to local bearing force:experiments[J].Thin-Walled Structures,2015,94:394-409.
[5]Huang Hong,Han Linhai,Tao Zhong,et al.Analytical behaviour of concrete-filled double skin steel tubular(CFDST)stub columns[J].Journal of Constructional Steel Research,2010,66(4):542-555.
[6]李帼昌,张春雨,于洪平.内置CFRP圆管的方钢管高强混凝土结构研究进展[J].工程力学,2012,29(增刊II):57-68.(Li Guochang,Zhang Chunyu,Yu Hongping.Advance in high-strength concrete filled square steel tubular structure with inner CFRP circular tube[J].Engineering Mechanics,2012,29(SII):57-68(in Chinese)).
[7]郎?,杨志坚,李泽良.内置CFRP管的方钢管混凝土轴压短柱失效分析及延性优化[J].土木建筑与环境工程,2014,36(4):22-27.(Lang Yan,Yang Zhijian,Li Zeliang.Failure analysis and ductility optimization of CFSST stub column with inner CFRP tube under axial compressive load[J].Journal of Civil,Architectural and Environmental Engineering,2014,36(4):22-27(in Chinese)).
[8]Yuan Weibin,Yang Junjie.Experimental and numerical studies of short concrete-filled double skin composite tube columns under axially compressive loads[J].Journal of Constructional Steel Research,2013,80:23-31.
[9]杨俊杰,戚晓锴.八边形中空夹层钢管混凝土柱PVC-U内管的性能研究[J].浙江工业大学学报,2013,41(6):672-676.(Yang Junjie,Qi Xiaokai.A study on the behavior of the inner PVC-U tube of the octagonal concrete-filled steel tube[J].Journal of Zhejiang University of Technology,2013,41(6):672-676(in Chinese)).
[10]黄宏,朱彦奇,陈梦成,等..矩形中空夹层再生混凝土钢管短柱轴压试验研究[J].实验力学,2016(1):67-74.(Huang Hong,Zhu Yanqi,Chen Mengcheng,et al.Experimental investigation on axial compression of rectangular recycled concrete-filled double-skin steel tube short column[J].Journal of Experimental Mechanics,2016(1):67-74(in Chinese)).
[11]黄宏,郭晓宇,陈梦成,等.圆钢管混凝土轴压短柱对比试验研究[J].广西大学学报:自然科学版,2015(4):806-814.(Huang Hong,Guo Xiaoyu,Chen Mengcheng,et al.Comparative experimental research on concrete-filled steel tubular columns subjected to axial compression[J].Journal of Guangxi University:Natural Science Edition,2015(4):806-814(in Chinese)).
[12]刘威.钢管混凝土局部受压时的工作机理研究[D].福州:福州大学,2005.(Liu Wei.Research on mechanism of concrete-filled steel tubes subjected to local compression[D].Fuzhou:Fuzhou University,2005(in Chinese)).
[13]Jiang S,Ma S,Liang C,et al.Axial behavior of CFRP-PVC-confined concrete stubs[J].Advanced Science Letters,2012,9(1):197-203.
[14]姜绍飞,冯义雄,吴兆旗,等.CFRP-PVC管混凝土压弯构件约束机理研究[J].哈尔滨工业大学学报,2011,43(增刊2):33-37.(Jiang Shaofei,Feng Yixiong,Wu Zhaoqi,et al.Study on the confining mechanism of concrete confined by CFRP-PVC tubes under axial load and bending moment[J].Journal of Harbin Institute of Technology,2011,43(S2):33-37(in Chinese)).