改性再生混凝土框架中节点纵筋粘结性能试验研究  

Experimental Study on Longitudinal Reinforcement Bond Behaviors of Modified Recycled Aggregate Concrete Frame Interior Beam-column Joints

作　　者：肖景平 付佳丽[2] 周卫东 柳炳康[2] 

机构地区：[1]华汇工程设计集团股份有限公司,浙江绍兴312000 [2]合肥工业大学土木与水利工程学院,安徽合肥2300093

出　　处：《工程抗震与加固改造》2016年第5期77-84,共8页Earthquake Resistant Engineering and Retrofitting

基　　金：住建部科学技术计划资助项目(2013-K4-46)

摘　　要：为研究反复荷载下改性再生混凝土节点纵向钢筋粘结性能,制作了2榀再生混凝土框架中节点进行低周反复荷载试验。在柱两侧梁端的纵筋预埋应变片,试验获得了纵筋荷载-应变滞回曲线。利用同一根纵筋两个测点应变差计算区段内的平均粘结应力,得到加载过程中纵筋通裂阶段、极限阶段、破坏阶段相对粘结强度。试验表明,在通裂阶段和极限阶段纵筋保有较为稳定的粘结应力,可以满足再生混凝土构件钢筋与混凝土之间通过粘结强度传递应力、协调变形的要求。添加粉煤灰的改性再生混凝土增强了再生骨料界面密实性和粘结作用,可提高钢筋粘结强度。The tests are carried out for two interior joint of modification recycled aggregate concrete under cyclic reverse loading.Longitudinal reinforcements are placed through beam-column joints,to study on bond behavior of reinforcements. Load-strain hysteretic curve of reinforcements are drawn by embedding strain gauges on longitudinal reinforcements at the end of beams. The average bond stress is calculated by the difference between two strain gauges at the same reinforcement,to investigate relative bond strength of joint in the fully cracking,the ultimate and the failure stage. The results show that the longitudinal reinforcements keep bond stress stable relatively in the fully cracking and the ultimate stage. It can satisfy the requirement of transferring stress and compatible deformation between reinforcements and concrete via bond strength. Adding fly ash in recycled aggregate concrete can enhance densification and bond stress at the interface of recycled aggregate concrete and increase the bond strength of reinforcements.

关 键 词：改性再生混凝土 低周反复荷载 中节点 纵向钢筋 粘结强度 

分 类 号：TU375.4[建筑科学—结构工程]