摘要
以兰州地铁1号线东岗车辆基地运用库框架柱为原型,制作并完成了4个1/4比例高强混凝土多重复合芯柱的低周反复荷载试验,分析了该类芯柱的破坏形态、刚度退化和滞回耗能等力学性能,研究了轴压比、箍筋间距、配箍形式等参数对该类新型柱抗震性能的影响。研究结果表明:高强混凝土多重复合芯柱主要发生了弯剪破坏,柱脚塑性铰区混凝土由于研磨效应而发生剥落,试件破坏时纵筋被压屈,呈灯笼状;复合芯柱的滞回曲线呈十分饱满的弓形,耗能能力强,表明该类芯柱的抗震性能优异;增加轴压比后芯柱发生剪切破坏,延性和耗能能力降低;增加箍筋间距使得试件后期承载力下降迅速,延性降低;双重复合芯柱比单芯柱的承载力高、耗能好,该类芯柱的抗震性能显著优于单芯柱的抗震性能。
Selecting the frame column of Donggang vehicle base located at Lanzhou Metro Line 1 as the prototype,four 1/4 scaled high-strength concrete multiple composite core columns were constructed and tested in the experimental program. The failure modes,stiffness degradation and hysteretic energy dissipation of high strength concrete multiple composite core columns were investigated. In addition,the effects of axial compression ratio,steel stirrup spacing and the type of stirrups on the seismic behavior of the high-strength concrete multiple composite core columns were studied. The tested results showed that the failure mode of high-strength concrete multiple composite core columns was the combination of bending damage and shearing destruction. When the specimen failed,the steel bar yielded and minor spalling of the concrete occurred at the plastic hinge area of the column foot due to the grinding effect,the longitudinal bars were buckled and turned into the shape of lantern. The hysteretic curves of high-strength concrete multiple composite core columns showed bow shapes,which showed the specimens have sufficient energy dissipation capacity to resist the earthquake. With the increase of axial compression ratio,the failure mode of high strength concrete multiple composite core columns changed from bend-shear failure to shear failure,and the ductility and energy dissipation capacity decreased. However,the increase of the stirrup spacing would decrease the bearing capacity of high strength concrete multiple composite core columns at the yielding stage,and reduce the ductility of the concrete column. The study showed that the double core column had a higher bearing capacity and energy dissipation capacity compared with single core column, and the seismic behavior of double core column was significantly better than that of the single core column.
引文
[1]孙治国,司炳君,王东升,等.高强箍筋高强混凝土柱抗震性能研究[J].工程力学,2010,27(5):128-136.
[2]范重,钱稼茹,吴学敏.核心配筋柱抗震性能试验研究[J].建筑结构学报,2001,22(1):14-19.
[3]杨勇,张超瑞,泮勇溥,等.内藏钢管超高强混凝土芯柱组合柱抗震性能试验研究[J].工程力学,2017,34(8):96-104.
[4]中华人民共和国住房和城乡建设部.建筑抗震设计规范:GB50011—2010[S].北京:中国建筑工业出版社,2010.
[5]中华人民共和国住房和城乡建设部.混凝土结构设计规范:GB 50010—2010[S].北京:中国建筑工业出版社,2010.
[6]中华人民共和国国家质量监督检验检疫总局.金属材料拉伸试验第1部分:室温试验方法:GB/T 228. 1—2010[S].北京:中国标准出版社,2011.
[7]中华人民共和国建设部.建筑抗震试验方法规程:JGJ 101—96[S].北京:中国建筑工业出版社,1997.
[8]中华人民共和国建设部.普通混凝土力学性能试验方法标准:GB/T 50081—2002[S].北京:中国建筑工业出版社,2002.
[9]陈家夔.钢筋混凝土框架柱的抗震性能[J].西南交通大学学报,1990,25(2):23-32.
[10] RAZVI S R,SAATCIOGLU M. Strength and Deformability of Confined High-Strength Concrete Columns[J]. ACI Structural Journal,1994,91(6):678-687.
[11] BAYRAK O,SHEIKH S A. High-Strength Concrete Columns Under Simulated Earthquake Loading[J]. ACI Structural Journal,1997,94(6):708-722.
[12]张国军,刘伯权,白国良.钢筋混凝土框架柱在高轴压比下的抗震性能试验[J].长安大学学报(自然科学版),2002,22(6):53-57.
[13]郭军庆,雷自学,周天华.往复荷载作用下加芯混凝土框架柱刚度与耗能试验分析[J].建筑结构,2008,38(5):45-48.
[14] BUDEK A M,PRISTLEY M,LEE C O. Seismic Design of Columns with High-Strength Wire and Strand as Spiral Reinforcement[J]. ACI Structural Journal,2002,99(5):660-670.
[15] RAZVI S, SAATCIOGLU M. Confinement Model for HighStrength Concrete[J]. Journal of Structural Engineering,1999,125(3):281-289.
[16]董三升,赵均海.不同配筋形式柱的抗震延性[J].建筑科学与工程学报,2010,27(3):121-126.
[17]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(12):3-6.
[18] SUGANO S,NAGASHIMA T,KIMURA H,et al. Experimental Studies on Seismic Behavior of Reinforced Concrete Members of High-Strength Concrete[C]∥Proceedings of 2nd International Symposium Utilization of High Strength Concrete. Detroit:1990.
[19]刘伯权,白国良,张国军.高轴压比高强混凝土框架柱抗震性能试验研究[J].土木工程学报,2005,38(1):45-50.
