底部加强型多腔钢管混凝土巨型柱抗震性能试验研究
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摘要
为适应巨型框架结构发展,提出了一种底部加强型多腔钢管混凝土巨型柱。为了比较它与相应普通多腔钢管混凝土巨型柱抗震性能的差异,进行了6个1/25缩尺的巨型柱模型在轴向压力或轴向拉力下的低周反复荷载试验研究。6个模型中:按底部截面构造区分,3个试件为底部加强型巨型柱模型,3个试件为相应普通巨型柱模型;按轴力作用方向区分,4个试件为轴压试件,轴压比分别为0.5、0.25,2个试件为轴拉试件,轴拉比为0.2。比较分析了各试件的承载力、刚度及其退化过程、延性、滞回特性、耗能和破坏特征。研究表明:底部加强型巨型柱与普通巨型柱相比,承载力、延性、耗能能力明显提高,刚度退化速度减慢,工作性能较稳定;轴压试件与轴拉试件相比,轴压试件抗震性能相对较好。
Due to the development in mega-frame structure,a multi-cell CFST mega-column with strengthened bottom was proposed.Six 1/25 scaled multi-cell CFST mega-column models were tested under horizontal low cyclic loading,as well as the axial compressive load or the axial tensile load.According to different bottom constructions,three columns with strengthened bottom and three normal columns were designed.According to different directions of vertical axial loads,there are four columns under the vertical axial pressure with axial force ratio 0.5 and 0.25,and the other two columns under vertical axial tension with axial tension ratio 0.2.The load-bearing capacity,stiffness and its degeneration,ductility,hysteretic properties,energy dissipation capacity,and failure characteristic of the models were compared and analyzed.Results of the experiments show that the load-bearing capacity,ductility,energy dissipation capacity of the mega-columns with strengthened bottom are greatly improved,the speed of their stiffness degeneration is slower,and their work performance is more stable compared to the normal mega-columns.The seismic behavior of the new mega-columns under vertical axial pressure is better than that under the vertical axial tension.
Due to the development in mega-frame structure,a multi-cell CFST mega-column with strengthened bottom was proposed.Six 1/25 scaled multi-cell CFST mega-column models were tested under horizontal low cyclic loading,as well as the axial compressive load or the axial tensile load.According to different bottom constructions,three columns with strengthened bottom and three normal columns were designed.According to different directions of vertical axial loads,there are four columns under the vertical axial pressure with axial force ratio 0.5 and 0.25,and the other two columns under vertical axial tension with axial tension ratio 0.2.The load-bearing capacity,stiffness and its degeneration,ductility,hysteretic properties,energy dissipation capacity,and failure characteristic of the models were compared and analyzed.Results of the experiments show that the load-bearing capacity,ductility,energy dissipation capacity of the mega-columns with strengthened bottom are greatly improved,the speed of their stiffness degeneration is slower,and their work performance is more stable compared to the normal mega-columns.The seismic behavior of the new mega-columns under vertical axial pressure is better than that under the vertical axial tension.
引文
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[3]左志亮,蔡健,朱昌宏.带约束拉杆L形钢管混凝土短柱的偏压试验研究[J].东南大学学报,2010,40(2):346-351.ZUO Zhiliang,CAI Jian,ZHU Changhong.Experimental research on L-shape CFT stub columns with binding bars subjected to eccentric compres-sion[J].Journal of Southeast University,2010,40(2):346-351.(in Chinese)
[4]左志亮,蔡健,钱泉,等.带约束拉杆T形钢管混凝土短柱轴压性能的试验研究[J].土木工程学报,2011,44(11):43-51.ZUO Zhiliang,CAI Jian,QIAN Quan,et al.Experimental study on T-shaped CFT stub columns with binding bars subjected to axial compression[J].China Civil Engineering Journal,2011,44(11):43-51.(in Chinese)
[5]林云峥.带约束拉杆十字形钢管混凝土柱轴压基本性能研究[D].广州:华南理工大学,2010.LIN Yunzheng.Research on the mechanical behavior of crisscross-shaped concrete-filled steel tube stub columns with binding bars[D].Guangzhou South China University of Technology,2010.(in Chinese)
[6]曾宇光,屠永清.多室式钢管混凝土T形柱压弯性能分析[J].钢结构,2010,25(5):8-11.ZENG Yuguang,TU Yongqing.Analysis of compress and bending performance of multi-cell T-shaped concrete-filled steel tube[J].Steel Con-struction,2010,25(5):8-11.(in Chinese)
[7]曹万林,关美荣,王立长,等.多腔扁钢管混凝土斜折柱抗震性能试验研究[J].地震工程与工程振动,2011,31(5):39-42.CAO Wanlin,GUAN Meirong,WANG Lichang,et al.Experimental study on seismic performance of multi-cavity flat concrete filled steel tube col-umn with gambrel[J].Journal of Earthquake Engineering and Engineering Vibration,2011,31(5):39-42.(in Chinese)
[8]CECS159:2004矩形钢管混凝土结构技术规程[S].北京:中国计划出版社,2004.CECS159:2004 Technical specification for structures with concrete-filled rectangular steel tube members[S].Beijing:China Planning Press,2004.(in Chinese)
[9]丁发兴,余志武.钢管混凝土短柱力学性能研究:理论分析[J].工程力学,2005,22(1):175-181.DING Faxing,YU Zhiwu.Theoretical analysis of mechanical properties of concrete-filled tubular steel stub columns[J].Engineering Mechanics,2005,22(1):175-181.(in Chinese)
[10]刘林林,屠永清,叶英华.基于ABAQUS的钢管混凝土L形柱有限元分析[J].沈阳工业大学学报,2011,33(3):349-354.LIU Linlin,TU Yongqing,YE Yinghua.Finite element analysis of L-shaped concrete filled steel tubular column based on ABAQUS[J].Journalof Shenyang University of Technology,2011,33(3):349-354.(in Chinese)
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