钢管轻集料混凝土长柱轴压性能试验研究
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摘要
对18根不同长细比和含钢率的钢管轻集料混凝土长柱进行轴压试验,研究了钢管轻集料混凝土长柱在轴心压力下的受力性能,并与钢管普通混凝土进行了对比.结果表明:钢管轻集料混凝土长柱破坏属于整体失稳破坏,长细比越大,其承载力和稳定系数越低,加载过程中由全截面受压转为一侧受拉一侧受压,最终因为挠度过大而破坏;相同长细比情况下,钢管轻集料混凝土构件的承载力随含钢率增大而增大;核心混凝土性能对钢管混凝土的界限长细比有一定影响,钢管轻集料混凝土的界限长细比低于钢管普通混凝土;钢管轻集料混凝土的稳定系数要高于长细比相同的钢管普通混凝土.
Based on axial compression tests of 18 lightweight aggregate concrete-filled steel tube(LACFST) long columns,the behavior of LACFST long columns was studied and compared with that of normal CFST.The results demonstrate that the failure of LACFST long columns belong to general instability failure. The larger the slenderness ratio,the lower the bearing capacity and stability factor.In the loading process,the stress distribution changes from compression on the whole section to compression on one side and tension on the other side.With the same slenderness ratio,the bearing capacity of the specimen increases with the steel ratio.The core concrete performance influences the boundary slenderness ratio and stability factor of LACFST.It is proved that the boundary slenderness ratio of LACFST is lower than that of normal CFST,and the stability factor of LACFST is larger than that of normal CFST.
Based on axial compression tests of 18 lightweight aggregate concrete-filled steel tube(LACFST) long columns,the behavior of LACFST long columns was studied and compared with that of normal CFST.The results demonstrate that the failure of LACFST long columns belong to general instability failure. The larger the slenderness ratio,the lower the bearing capacity and stability factor.In the loading process,the stress distribution changes from compression on the whole section to compression on one side and tension on the other side.With the same slenderness ratio,the bearing capacity of the specimen increases with the steel ratio.The core concrete performance influences the boundary slenderness ratio and stability factor of LACFST.It is proved that the boundary slenderness ratio of LACFST is lower than that of normal CFST,and the stability factor of LACFST is larger than that of normal CFST.
引文
[1]韩林海.钢管混凝土结构——理论与实践[M].北京:科学出版社,2004.
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[4]Susantha K A S,Ge H,Usami T.Uniaxial stress-strainrelationship of concrete confined by various shaped steeltubes[J].Engineering Structures,2001,23(10):1331-1347.
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[11]丁发兴,余志武,蒋丽忠.圆钢管混凝土轴压中长柱的承载力[J].中国公路学报,2007,20(4):65-70.Ding Faxing,Yu Zhiwu,Jiang Lizhong.Bearing capac-ity of middle long concrete filled circular steel tubularcolumns under axial compression[J].China Journalof Highway and Transport,2007,20(4):65-70.(inChinese)
[12]Baig M N,Fan J S,Nie J G.Strength of concretefilled steel tubular columns[J].Tsinghua Science andTechnology,2006,11(6):657-666.
[13]李斌,闻洋.钢管混凝土轴压长柱承载力的试验研究[J].地震工程与工程振动,2003,23(5):130-133.Li Bin,Wen Yang.Experimental study on bearing ca-pacity of long concrete filled steel tubular columns withaxial compression[J].Earthquake Engineering andEngineering Vibration,2003,23(5):130-133.(in Chi-nese)
[14]蔡绍怀.现代钢管混凝土结构[M].北京:人民交通出版社,2003:146-152.
[2]吉伯海,王晓亮,马敬海,等.钢管高强轻集料混凝土短柱轴压性能的试验研究[J].建筑结构学报,2005,26(5):60-65.Ji Bohai,Wang Xiaoliang,Ma Jinghai,et al.Experi-mental study on the behavior of high-strength light-weight aggregate concrete filled steel tube under axialcompression[J].Journal of Building Structures,2005,26(5):60-65.(in Chinese)
[3]Elremaily A,Azizinamini A.Behavior and strength ofcircular concrete-filled tube columns[J].Journal ofConstructional Steel Research,2002,58(12):1567-1591.
[4]Susantha K A S,Ge H,Usami T.Uniaxial stress-strainrelationship of concrete confined by various shaped steeltubes[J].Engineering Structures,2001,23(10):1331-1347.
[5]Wang Qingxiang,Zhao Dazhou,Guan Ping.Experi-mental study on the strength and ductility of steel tubularcolumns filled with steel-reinforced concrete[J].Engi-neering Structures,2004,26(7):907-915.
[6]Han L H,Yao G H.Behaviour of concrete-filled hol-low structural steel(HSS)columns with pre-load on thesteel tubes[J].Journal of Constructional Steel Re-search,2003,59(12):1455-1475.
[7]吉伯海,周文杰,王晓亮.钢管轻集料混凝土中长柱轴压性能的试验研究[J].建筑结构学报,2007,28(5):118-123.Ji Bohai,Zhou Wenjie,Wang Xiaoliang.Experimentalstudy on the behavior of lightweight aggregate concretefilled steel tube middle long columns under axial comp-ression[J].Journal of Building Structures,2007,28(5):118-123.(in Chinese)
[8]国家标准委员会.GB/T228—2002金属材料室温拉伸试验方法[S].北京:中国标准出版社,2002.
[9]Zeghiche J,Chaoui K.An experimental behaviour ofconcrete-filled steel tubular columns[J].Journal ofConstructional Steel Research,2005,7(1):53-66.
[10]黄平明,张文征,刘国林,等.内填式钢管混凝土构件受箍机理分析[J].西安公路交通大学学报,2001,21(4):43-45.Huang Pingming,Zhang Wenzheng,Liu Guoling,etal.The analysis of the hooping mechanism of CFST[J].Journal of Xi an Highway University,2001,21(4):43-45.(in Chinese)
[11]丁发兴,余志武,蒋丽忠.圆钢管混凝土轴压中长柱的承载力[J].中国公路学报,2007,20(4):65-70.Ding Faxing,Yu Zhiwu,Jiang Lizhong.Bearing capac-ity of middle long concrete filled circular steel tubularcolumns under axial compression[J].China Journalof Highway and Transport,2007,20(4):65-70.(inChinese)
[12]Baig M N,Fan J S,Nie J G.Strength of concretefilled steel tubular columns[J].Tsinghua Science andTechnology,2006,11(6):657-666.
[13]李斌,闻洋.钢管混凝土轴压长柱承载力的试验研究[J].地震工程与工程振动,2003,23(5):130-133.Li Bin,Wen Yang.Experimental study on bearing ca-pacity of long concrete filled steel tubular columns withaxial compression[J].Earthquake Engineering andEngineering Vibration,2003,23(5):130-133.(in Chi-nese)
[14]蔡绍怀.现代钢管混凝土结构[M].北京:人民交通出版社,2003:146-152.
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