高温对钢筋与混凝土黏结性能影响的试验研究  

EXPERIMENTAL RESEARCH OF HIGH TEMPERATURE EFFECT ON BONDINGPERFORMANCES BETWEEN STEEL BARS AND CONCRETE

作　　者：周立琛 刘利[2] 李雅宁[2] 李晓东[1] 魏晓 肖瑶 ZHOU Lichen;LIU Li;LI Yaning;LI Xiaodong;WEI Xiao;XIAO Yao(School of Civil Engineering,Qingdao University of Technology,Qingdao 266033,China;Shandong Water Conservancy Vocational College,Rizhao 276826,China)

机构地区：[1]青岛理工大学土木工程学院,山东青岛266033 [2]山东水利职业学院,山东日照276826

出　　处：《工业建筑》2021年第1期73-80,共8页Industrial Construction

摘　　要：对44个普通混凝土和再生混凝土(粗骨料取代率为100%)立方体试件在高温环境进行中心拉拔试验,研究了钢筋与混凝土在高温后与高温下的黏结性能损伤规律及黏结-滑移(τ-s)关系曲线特点。试验结果表明:高温后和高温下,钢筋与混凝土的极限黏结强度均随温度增加而减小,极限滑移值随温度的增加而增大。根据钢筋与混凝土的黏结-滑移曲线变化特点,可将高温环境下钢筋与混凝土的黏结滑移破坏过程详细划分为五个阶段进行黏结性能损伤分析,通过设定损伤变量并采用回归分析方法,拟合建立钢筋与混凝土在高温后及高温下的τ-s关系方程,并经过试验偏差核算得出计算结果与试验结果吻合较好。Central pulling test on 44 cubic specimens of conventional concrete and recycled concrete(the replacement ratio of coarse aggregate is 100%)were subjected to high temperatures.Tthe damage laws of bonding performances of the steel bars and concrete after and in high temperatures and the characteristics of bond-slip(τ-s)relation curves were studied.The experimental results showed that after and in high temperatures,the ultimate bond strength of steel bars and concrete decreased with increase of temperatures,and the ultimate slip values increased with increase of temperatures.According to the changing characteristics of the bond-slip curves between steel bars and concrete,the bond-slip failure process of steel bars and concrete in high temperaturs could be divided into five stages to analyze the bond performance damage.By setting damage variables and using regression analysis methods,to establish theτ-s relation equations between steel bars and concrete after and in high temperatures.And through the calculation of test deviation,the calculation results were in good agreements with the test results.

关 键 词：钢筋 混凝土 高温环境 黏结性能 τ-s关系方程 

分 类 号：TU375[建筑科学—结构工程]