期刊名称：IOP Conference Series: Earth and Environmental Science
印刷版ISSN：1755-1307
电子版ISSN：1755-1315
出版年度：2019
卷号：304
期号：3
页码：1-6
DOI：10.1088/1755-1315/304/3/032080
出版社：IOP Publishing
摘要：This paper presents an experimental study of reinforced concrete beams strengthened with CFRP laminates and anchored with carbon fibre anchors under monotonic static and cyclic loading. To gain full advantage of externally bonded CFRP technique, it is important to avoid premature debonding of the laminates, and CFRP anchors have the potential to prevent this happening by transferring the stress from steel reinforcement to the laminates. In this study, cyclic tests were conducted to investigate the fatigue behaviour of the strengthened beams and to identify strengthening effects of various anchoring depths. The aim of the monotonic tests was to determine strengthening efficiency of the new anchoring technique and to evaluate serviceability and ultimate states of the beams. According to the results, a damage index was proposed based on fractal analysis of cracks under cyclic loading and validated through ultrasonic inspection analysis. In addition, an empirical equation between average reduction of ultrasonic wave velocity and residual bearing capacity was established.
