外方内双圆箍筋约束高强混凝土柱抗震性能试验研究  

EXPERIMENTAL RESEARCH ON THE SEISMIC BEHAVIOR OF HIGH-STRENGTH CONCRETE COLUMNS CONFINED BY DOUBLE CIRCULAR STIRRUPS AND RECTANGULAR STIRRUPS

作　　者：黄永安[1] 张超凡 HUANG Yongan;ZHANG Chaofan(China Railway First Surver & Design Institute Group Ltd.,Xi’an 710043,China)

机构地区：[1]中铁第一勘察设计院集团有限公司

出　　处：《工业建筑》2019年第6期87-93,共7页Industrial Construction

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.

关 键 词：芯柱 试验研究 抗震性能 高强混凝土 滞回曲线 

分 类 号：TU352.11[建筑科学—结构工程] TU37