高轴压比方钢管高强混凝土柱抗震性能研究
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摘要
为研究高轴压比方钢管高强混凝土柱的抗震性能,完成了8根轴压比从0.5―0.7的方钢管高强混凝土柱的往复水平加载试验。通过改变试件的轴压比、含钢率和长细比,研究其在往复水平荷载作用下的滞回性能、变形能力以及耗能能力,比较各参数对试验结果的影响。试验结果表明:试件破坏形态为柱底部截面钢管被压曲、核心混凝土被压碎的压弯型破坏;试件的滞回曲线饱满,没有明显的捏缩现象;位移延性系数在3.05―4.07之间,等效粘滞阻尼比在0.25―0.31之间,延性系数和耗能指标均满足结构抗震设计要求。表明高轴压比方钢管高强混凝土柱具有良好的抗震性能。基于ABAQUS分析平台,建立了有限元模型,对试验进行了往复水平荷载作用下的全过程模拟分析。分析结果表明:有限元模型分析得到的滞回曲线与试验滞回曲线总体上吻合较好。
To test the aseismic behavior of rectangular steel tubular(HCRST) columns filled with high strength concrete,an experiment of eight specimens was carried out under cyclic lateral load and high axial load ratios varying from 0.5 to 0.7.The hysteretic behavior,deformability,and energy dissipation capacity were measured by the changes of the axial load ratio,steel ratio and the slenderness ratio of the specimens.The influences of the specimen parameter were compared.The experimental results show that there are two failure models of the column including the bucking of the steel tube and the crash of core concrete at the base of the specimens.The HCRST columns have the plump hysteretic curves.There is no significant pinch phenomenon.The ductility coefficient varying from 3.05 to 4.07 and the equivalent viscous damping ratio varying from 0.25 and 0.31 can meet the requirements of aseismic design.The experimental results indicate that HCRST columns with high axial load ratio have excellent earthquake resistace.In addition,a finite element model was established and applied to the analysis by the software of ABAQUS.The numerical simulation results are in agreement well with those of the experiments.
To test the aseismic behavior of rectangular steel tubular(HCRST) columns filled with high strength concrete,an experiment of eight specimens was carried out under cyclic lateral load and high axial load ratios varying from 0.5 to 0.7.The hysteretic behavior,deformability,and energy dissipation capacity were measured by the changes of the axial load ratio,steel ratio and the slenderness ratio of the specimens.The influences of the specimen parameter were compared.The experimental results show that there are two failure models of the column including the bucking of the steel tube and the crash of core concrete at the base of the specimens.The HCRST columns have the plump hysteretic curves.There is no significant pinch phenomenon.The ductility coefficient varying from 3.05 to 4.07 and the equivalent viscous damping ratio varying from 0.25 and 0.31 can meet the requirements of aseismic design.The experimental results indicate that HCRST columns with high axial load ratio have excellent earthquake resistace.In addition,a finite element model was established and applied to the analysis by the software of ABAQUS.The numerical simulation results are in agreement well with those of the experiments.
引文
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[2]Kang C H,Moon T S.Behavior of concrete-filled steel tubular beam-column under combined axial and lateral forces[C].Proceedings of the Fifth Pacific Structural Steel Conference,Seoul,Korea,1998:961―966.
[3]Shinji Yamazaki,Susumu Minami.Experimental study on inelastic behavior of steel beam-columns subject to varying force and cyclic lateral load[J].Journal of Structural Construction,2002,519:95―102.
[4]Varma Amit H,Richard J M.Seismic behavior and design of high-strength square concrete-filled steel tube beam columns[J].Journal of Structural Engineering(ASCE),2004,13(2):169―179.
[5]吕西林,陆伟东.反复荷载作用下方钢管混凝土柱的抗震性能试验研究[J].建筑结构学报,2000,21(2):2―10.Lu Xilin,Lu Weidong.Aseismic behavior of concrete-filled rectangular steel tubular columns under cyclic loading[J].Journal of Building Structures,2000,21(2):2―10.(in Chinese)
[6]游经团.矩形钢管混凝土压弯构件滞回性能研究[D].福州:福州大学,2002:17―40.You Jingtuan.Study for dynamical behaviors of concrete filled rectangular steel tubes[D].Fuzhou:Fuzhou University,2002:17―40.(in Chinese)
[7]王来.方钢管混凝土框架抗震性能的试验与理论研究[D].天津:天津大学,2005:13―35.Wang Lai.Experimental and theoretical research on seismic behavior of concrete-filled rectangular tubular Frame[D].Tianjin:Tianjin University,2005:13―35.(in Chinese)
[8]中国建筑科学研究院.JGJ101-96建筑抗震试验方法规程[S].北京:中国建筑工业出版社,1997.China Academy of Building Research.JGJ101-96,Specification of testing methods for earthquake resistant building[S].Beijing:Chinese Building Industry Press,1997.(in Chinese)
[9]谢涛,陈肇元.高强混凝土柱抗震性能的试验研究[J].建筑结构,1998,19(12):1―8.Xie Tao,Chen Zhaoyuan.Experimental study on seismic behaviors of high strength concrete columns[J].Building Structure,1998,19(12):1―8.(in Chinese)
[10]Hibbitt,Karlsson&Sorenson Inc.ABAQUS Documentation[Z].American,HKSINC,2005.
[11]余勇,吕西林.方钢管混凝土柱的三维非线性分析[J].地震工程与工程振动,1999,19(1):57―64.Yu Yong,Lu Xiling.3D nonlinear analysis for concrete filled rectangular tube columns[J].Earthquake Engineering and Engineering Vibration,1999,19(1):57―64.(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,2005:57―66.Liu Wei.Research on mechanism of concrete-filled steel tubes subjected to local compression[D].Fuzhou:Fuzhou University,2005:57―66.(in Chinese)
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