External radial stiffeners to improve seismic capacity of pile supported wharves

    Abstract:  Most steel piles suffer from low ductility because of their non-compact cross sections. In this study, ductility of steel piles is improved through external  radial  stiffeners  (ERS)  placed  in  a  radial  pattern  around  the external wall of the pile. The ERS would be placed close to the plastic hinge  regions.  Hysteretic  behaviors  of  piles  with  and  without  the proposed stiffener are numerically investigated and compared with each other. Obtained results indicate that ERS would delay local buckling of the steel piles and in this way strength degradation would be alleviated. In  other  words,  ductility  capacity  of  steel  piles  with  ERS  would  be greatly  improved.  A  parametric  study  is  also  carried  out  to  explore optimum geometry and number of required stiffeners. Finally, using a nonlinear  static  analysis,  efficiency  of  the  proposed  technique  is investigated  for  a  pile-supported  wharf  located  at  the  Port  of  Sirik  in south of Iran. The proposed technique can be used either in the case of new  designs  or  for  retrofit  purposes.  It  turned  out  that  the  external stiffeners are substantially beneficial for seismic rehabilitation of highly corroded steel piles.

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