摘要
通过14根钢管活性粉末混凝土(钢管RPC)长柱试件的轴压试验,研究钢管RPC柱的长细比及大长细比下套箍系数对钢管RPC柱轴压性能的影响。结果表明:试件的破坏基本属弹性失稳破坏类型,其中长细比较小的试件除弯曲失稳破坏外还伴随着局部受压鼓曲破坏,长细比越小,试件的延性破坏特点越明显,随着长细比的增加,试件也由弹性破坏逐渐转向失稳破坏;试验得到的钢管RPC长柱轴压荷载—应变曲线主要分为弹性阶段、弹塑性阶段和卸载阶段;在相同套箍系数下,随着长细比的增加,钢管RPC长柱的极限承载力和极限位移均逐渐降低;在大长细比下试件的套箍系数越大,其极限承载力也越大,但增加的幅度逐渐变小,钢管对RPC的约束能力不如普通混凝土。
Influences of different slenderness ratio and different hoop coefficient with bigger slenderness ratio on RPC (Reactive Powder Concrete) filled circular steel tube slender columns were studied based on 14 tests of RPC filled circular steel tube slender columns subjected to axial compression.The results showed that the compressive failure modes of the columns were entire elastic buckling and accompanied by local buckling for specimens with smaller slenderness.The specimens with smaller slenderness acted more ductile failure characteristics and the failure mode turned into buckling with increasing of slenderness ratio.There were three phases in the load-strain curves obtained from the tests:elastic phase,elastic-plastic phase and unloading phase.For specimens with the same hoop coefficient,both the ultimate strength and ultimate displacement of them gradually reduced with increasing of slenderness ratio.For specimens with bigger slenderness ratio,the ultimate strength increased with increasing of hoop coefficient,however,the rate of increase gradually decreased,which showed that the effect of confinement from steel tube to RPC is less than that to ordinary concrete.
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2014年第1期28-33,共6页
China Railway Science
基金
教育部中央高校基本科研业务费资助项目(2013YJS056)
关键词
钢管活性粉末混凝土
长柱
轴压
长细比
套箍系数
弹性失稳破坏
RPC filled circular steel tube
Slender column
Axial load
Slenderness ratio
Hoop coefficient
Elastic buckling