TY - JOUR
T1 - Innovative additional aluminum alloy ribs anchorage for improving the bond reliability of pretensioned CFRP bar
T2 - A feasibility study
AU - Zhu, Hong
AU - Wang, Qiang
AU - Dai, Jian-Guo
AU - Wang, Chunlin
AU - Wu, Gang
PY - 2022/1/15
Y1 - 2022/1/15
N2 - An innovative anchorage method for CFRP bars through providing additional aluminium alloy ribs (ARs for brevity) is proposed in this paper. The results of the pull-out tests are firstly summarized to comprehensively evaluate the bond performance of ARs anchored CFRP bars in concrete and the arrangement of the ARs along the bond length of the CFRP bars was meanwhile optimized. The transfer length test for the pretensioned CFRP bar was then performed to investigate the effect of the ARs on the bond transfer at prestress releasing. It was found that ARs anchored bar had resulted in a shorter transfer length in comparison to that of the unanchored bar due to an improved bond mechanism. Finally, the feasibility of using such ARs anchored CFRP bars in pretensioned prestressed concrete (PPC) members was explored by performing short- and long-term tests, respectively. The results showed that the ARs presence could lead to benefits of enhancing the shear anti-cracking capacity, reducing the end slips, and delaying the long-term deflection increase of the CFRP reinforced PPC beams, proving that the ARs can act as a reliable end anchorage system for pretensioned CFRP bars in PPC members. © 2021 Published by Elsevier Ltd.
AB - An innovative anchorage method for CFRP bars through providing additional aluminium alloy ribs (ARs for brevity) is proposed in this paper. The results of the pull-out tests are firstly summarized to comprehensively evaluate the bond performance of ARs anchored CFRP bars in concrete and the arrangement of the ARs along the bond length of the CFRP bars was meanwhile optimized. The transfer length test for the pretensioned CFRP bar was then performed to investigate the effect of the ARs on the bond transfer at prestress releasing. It was found that ARs anchored bar had resulted in a shorter transfer length in comparison to that of the unanchored bar due to an improved bond mechanism. Finally, the feasibility of using such ARs anchored CFRP bars in pretensioned prestressed concrete (PPC) members was explored by performing short- and long-term tests, respectively. The results showed that the ARs presence could lead to benefits of enhancing the shear anti-cracking capacity, reducing the end slips, and delaying the long-term deflection increase of the CFRP reinforced PPC beams, proving that the ARs can act as a reliable end anchorage system for pretensioned CFRP bars in PPC members. © 2021 Published by Elsevier Ltd.
KW - Additional aluminium alloy ribs
KW - Bond
KW - CFRP bar
KW - Pretensioned concrete
KW - Slippage
UR - http://www.scopus.com/inward/record.url?scp=85118842494&partnerID=8YFLogxK
UR - https://www.scopus.com/record/pubmetrics.uri?eid=2-s2.0-85118842494&origin=recordpage
U2 - 10.1016/j.compstruct.2021.114817
DO - 10.1016/j.compstruct.2021.114817
M3 - RGC 21 - Publication in refereed journal
AN - SCOPUS:85118842494
SN - 0263-8223
VL - 280
JO - Composite Structures
JF - Composite Structures
M1 - 114817
ER -