Ductility Performance on Jetty Steel Piles Repaired by Steel Patch Plates
Kazuo Furunishi1, Yasuo Kitane2, Yoshito Itoh3
1 Toyo-Giken Consulting Civil Engineers Inc.
1-6-10 Nishiki Naka-ku, Nagoya 460-0003, Aichi, Japan
k-furunishi@futasoku.co.jp
2 Nagoya University, Department of Civil Engineering
Furo-cho Chikusa-ku, Nagoya 464-8603, Aichi, Japan
ykitane@civil.nagoya-u.ac.jp
3 National Institute of Technology, Gifu College
2236-2 Kamimakuwa, Motosu 501-0495, Gifu, Japan
Itoh@gifu-nct.ac.jp
Abstract. This paper presents a study on ductility capacity of corrosion-damaged steel pipe piles repaired by welded patch plates. In this study, cyclic flexural tests of repaired pipes are performed, and the experimental results are compaired with finite element (FE) analyses. From numerical results, the buckling behaviour of thickness-reduced steel pipe repaired by patch plate is examined. Secondly, the whole model of piled jetty is analysed by FE to understand the buckling behaviour of repaired steel pipe. The bi-linear force-displacement relationship is used for spring elements to represent horizontal resistance of soil. Variation of corrosion thickness is modelled based on actual data of corroded steel pipe. Furthermore, the whole FE model is used to study the seismic behaviour of a piled jetty. From the time history response analysis, it is shown that the steel piled jetty repaired by steel patch plate behaves in a similar manner to the intact piled jetty. In conclusion, based on pushover analysis of a number of cantilever FE models, an empirical formula to determine the repaired thickness of patch plate is proposed for the repair design of corroded steel pipe. And then, an empirical formula on the ductility capacity of repaired steel piled pipes is proposed for the repair design of corroded steel pile.
Keywords: Corroded steel pipe, Seismic behaviour, Repaire design, Load carrying capacity, Ductility capacity.
