Behaviour of corroded circular steel tube strengthened with external FRP tube grouting under eccentric loading: numerical study

• Main Authors: Fu, Hao, Zhao, Huanhuan, Pan, Zhiyong, Wu, Zhaoqi, Chin, Chee Loong, Ma, Chau Khun
• Format: Article
• Published: Elsevier Ltd 2023
• Subjects: TA Engineering (General). Civil engineering (General)
• Online Access: http://eprints.utm.my/107160/; http://dx.doi.org/10.1016/j.istruc.2023.06.141
• Institution: Universiti Teknologi Malaysia

This paper uses ABAQUS software to perform finite element simulation on eccentric compression member of corroded circular steel tubes strengthened by FRP tube grouting. The working mechanisms, failure mode and the lifting of mechanical properties are investigated. The results show that the load–displacement curve of the member represents both bilinear and trilinear models. The former is in the overall buckling failure mode, while the latter is in the strength failure mode of the circular steel tube with bare ends. After strengthening, the bearing capacity increases by up to 114.99%. Moreover, the increase positively correlates with corrosion rate, grouting thickness, and FRP tube thickness. It first decreases before increasing as the slenderness ratio changes, while the concrete strength has little effect. At the same time, the bound flexural stiffness ratio is derived and provides reference suggestions for the practical engineering application of FRP tube grouting to strengthen corroded steel structures.