Equivalent material model of corroded prestressingsteel strand

Abstract

One of the main load resisting elements in prestressed concrete bridges is prestressing steel.Corrosion of the prestressing steel is generally protected by grouting and duct. Even thoughthe strand is crucial, it is difficult to visually inspect the corrosion. In this paper, corrosionof the strand is classified into three types according to observation of corroded strandsfrom existing bridges. Equations for section loss of the corroded strand were suggested.Mechanical properties of the corroded strand such as strength and ductility were estimatedby tensile test. Finite element analysis on the corroded wire and the proposed spring modelprovided equivalent stress-strain models for corroded prestressing steel. The suggestedmodels were verified by the tensile tests and can be utilised for the analysis of prestressedconcrete members with corroded strands. © 2019 Published by Elsevier Editora Ltda.