摘要
为研究橡胶混凝土梁柱节点的纵筋黏结性能,设计并制作了4个梁柱节点试件,其中1个为普通混凝土足尺节点,3个为橡胶混凝土足尺节点,橡胶取代率为15%。对各试件分别进行低周反复荷载试验,得到不同材料和不同轴压比下的破坏模式、荷载-位移滞回曲线和纵筋黏结应力滞回曲线,并对纵筋平均黏结应力进行分析。结果表明,低周反复荷载下,各节点试件的破坏模式均为核心区的剪切破坏;平均黏结应力与荷载呈线性增长关系,进入屈服阶段后,平均黏结应力达到峰值并逐渐退化,产生黏结滑移;在同等混凝土强度等级下,橡胶的添加使梁柱节点纵向钢筋黏结强度降低了5%;增大轴压比,节点纵向钢筋黏结应力和相对黏结强度均随之增大,黏结性能提高,高轴压比(0.59)下的纵筋黏结强度比中(0.37)、低(0.15)轴压比下的强度分别增大5%、13%;在该橡胶取代率下,高轴压比(0.59)对纵筋黏结性能的提高作用大于添加橡胶对其的减弱作用。
In order to study the longitudinal reinforcement bonding performance of crumb rubber concrete beam-column joints,four beam-column joints specimens were designed and fabricated,including one full-scale joint of ordinary concrete and three full-scale joints of rubber concrete.The rubber replacement rate was 15%.Low cyclic loading tests were carried out on each specimen to obtain the failure modes,load-displacement hysteresis curves and bond stress hysteresis curves of longitudinal bars under different materials and axial compression ratios,and the average bond stress of longitudinal bars was analyzed.The results show that under low cyclic loading,the failure mode of each node specimen is the shear failure of the core area.The average bond stress increases linearly with load.After entering the yield stage,the average bond stress reaches the peak and gradually degenerates,resulting in bond slip.At the same concrete strength grade,the bond strength of longitudinal reinforcement in beam-column joints is reduced by 5%by adding rubber.With the increase of axial compression ratio,the bond stress and relative bond strength of longitudinal reinforcement increase,and the bonding performance is improved.The bond strength of longitudinal bars at high axial pressure ratio(0.59)is 5%and 13%higher than that at medium(0.37)and low(0.15)axial pressure ratios,respectively.Under the rubber replacement rate,the effect of high axial pressure ratio(0.59)on the bond performance of longitudinal reinforcement is greater than that of adding rubber.
作者
楚留声
王启源
王帅起
程站起
王起帆
CHU Liusheng;WANG Qiyuan;WANG Shuaiqi;CHENG Zhanqi;WANG Qifan(School of Civil Engineering,Zhengzhou University,Zhengzhou 450001,China;Department of Civil Engineering,Army Logistics Academy,Chongqing 401331,China)
出处
《郑州大学学报（工学版）》
CAS
北大核心
2022年第4期74-79,共6页
Journal of Zhengzhou University（Engineering Science）
基金
河南省科技攻关项目(202102310578)。
关键词
橡胶混凝土
节点
纵筋黏结应力
低周反复荷载试验
轴压比
crumb rubber concrete
joint
longitudinal reinforcement bond stress
low cyclic loading test
axial compression ratio
