（1 湖南大学教育部建筑安全与节能重点实验室， 长沙 410082；  2 华侨大学土木工程学院， 厦门 361021）

［摘要］为研究高温下钢筋与混凝土粘结性能随温度升高的退化规律，开展了15个钢筋混凝土粘结锚固试件常温及高温下的中心拉拔试验，分析了高温下极限粘结强度、极限滑移与粘结滑移（τ-s）曲线的特点。对历年来高温下钢筋与混凝土粘结试验数据进行了统计分析，并采用有限元温度场分析对试验温度场进行修正，在修正数据基础上建立了高温下钢筋与混凝土相对粘结强度的计算公式和τ-s本构模型。研究结果表明：高温下与高温后钢筋与混凝土的粘结强度均随着温度升高呈现下降的趋势，高温后试件粘结强度下降趋势较高温下更快，且极限滑移也小于高温下试件；升温制度对试件实际温度场具有显著影响，分析时应考虑升温制度的影响并进行修正；回归分析建立的τ-s模型与试验结果吻合良好。

［关键词］高温； 钢筋混凝土； 粘结性能； 统计分析

中图分类号：TU375文献标识码：A文章编号：1002-848X(2019)10-0076-05

Experimental study and analysis on bond behaviour between steel bar and concrete

Zhou Zijian1, Huo Jingsi1,2, Li Zhi1

(1 China Ministry of Education Key Laboratory of Building Safety and Energy Efficiency, Hunan University, Changsha 410082, China;  2 College of Civil Engineering, Huaqiao University, Xiamen 361021, China)

Abstract:In order to study the degradation law of the bond performance between steel bar and concrete with high temperature under elevated temperature, the center pull-out test of 15 reinforced concrete bonded anchor specimens at normal temperature and high temperature was carried out, and the characteristics of ultimate bond strength, ultimate slip and bond-slip(τ-s ) curves at high temperature were analyzed. The statistical analysis of bond behaviour between steel bar and concrete bond test data under high temperature over the years was carried out, and the test temperature field was corrected by finite element temperature field analysis. Based on the revised data, the calculation formula of   relative bond strength  and τ-s constitutive model  under high temperature were established. The results indicate that the bond strength under and after high temperature decrease with temperature rises. Not only the bond strength after high temperatures degrades more greatly than at high temperatures, but also the ultimate slip is smaller than the latter. The influence of heating program should be taken into consideration when analysis because the heating program has a great effect on the actual temperature field of specimens. The τ-s model established on the basis of regression analysis fits well with the test results.

Keywords:high temperature; reinforced concrete; bond property; statistic analysis