CFRP-混凝土界面粘结滑移本构关系试验研究

An Experimental Study on Bond-Slip Constitutive Relationships of the CFRP-Concrete Interface

摘要: 鉴于碳纤维复合材料(CFRP)的轻质高强、耐腐蚀、施工方便等特点，使用CFRP对结构进行维修加固也越来越广泛。然而，混凝土与CFRP粘结界面的粘结剪应力与滑移之间的本构关系却还没有形成统一的认识，尤其是本构关系的下降段更是难以准确测量出来。本文在于改进方法下实验探究粘结界面的粘结应力–滑移(τ-δ)本构关系，争取实验测出CFRP-混凝土界面的τ-δ本构关系全曲线。试验采用改进的双拉试件，采用水平加载，排除附加弯矩影响，提高实验结准确性。实测17个试件的CFRP界面τ-δ本构关系曲线，根据τ-δ本构关系曲线特性，分析粘结面受力特点。
>In view of the light weight, high strength, corrosion resistance and convenient construction of carbon fiber reinforced polymer (CFRP), using CFRP to strengthen structure is becoming more and more widely. However, there is no commonly accepted understanding of the constitutive relationship of the bonding shear stress and slip between con-crete and CFRP bonded interface; especially the decline of the constitutive relation is more difficult to measure accu-rately. The aim of this paper is to improve the experiment to explore bond stress and slip (τ-δ) constitutive relation of the bonding interface, making sure that the experiment can measure the τ-δ constitutive relation curve of CFRP-concrete interface. Double pull test was adopted with the improved specimen, using the horizontal load, to eliminate additional bending moment influence and improve the experimental accuracy. 17 specimens were tested to measure the τ-δ curves. According to the features of the constitutive relation curves, the mechanical characteristics of the bonding interface were further analyzed.