中文摘要：

为了揭示带锈蚀钢箍接头的老旧混凝土电杆经碳纤维布（CFRP）加固后的承载性能及破坏机理，采用南方电网西南线某路段的4根电杆为试验对象（其中2根纵向黏贴两层CFRP，1根纵向黏贴单层CFRP，1根未进行相关加固措施）进行了抗弯承载力试验。通过试验，观察了各试件的受力全过程及破坏形态，获取了荷载一挠度曲线、刚度退化曲线及极限承载力等重要指标。研究结果表明：加固接头试件的破坏主要表现为混凝土与CFRP的表面粘脱失效，过程迅速，具有脆性破坏特点。CFRP加固后试件的截面应变仍符合平截面假定。加固试件的承载力和刚度远大于未加固试件的相应值，黏贴双层CFRP的试件比单层CFRP试件的承载力高，前者的初始刚度和弹塑性刚度均比后者各阶段刚度有所改善。综合考虑后，建议采用纵向黏贴单层碳纤维布较为经济合理，研究成果可供同类服役混凝土电杆的加固设计提供参考。

英文摘要：

In order to reveal the bearing capacity and failure mechanism of CFRP strengthened existing reinforced concrete poles with corrosion steel collar joints, three poles from a road section of Southwest line in the Southern Power Grid were selected to conduct flexural capacity test research. Two pole specimens were pasted with double vertical CFRP and one pole specimen was pasted with single vertical CFRP. The whole process of forcing and fail- ure mode of all specimens was observed by the test, and the important indicators, such as curves of load-deflection, curves of stiffness degeneration and ultimate bearing capacity, were obtained. Results indicated that the strength- ened poles with connection joints were mainly bond failure between concrete and the external CFRP, the damage process is very fast, and the failure feature is brittle. These specimens＇ cross-sectional strains conform to the as- sumption of plane cross-section. Also, bearing capacity and stiffness of the strengthened specimens are much larger than those without CFRP. The bearing capacity of specimens pasted with double CFRPs is larger than that of the specimen with single CFRP. Comparing the initial stiffness and elastic-plastic stiffness, it is seen that the ones with double CFRPs are a little higher than the one with single CFRP. Weighting the cost-effective effect, it is deter-mined that pasting single-layer CFRP longitudinally is more economical and reasonable. The results can provide a reference to the same type of existing reinforced concrete poles for reinforcing design.