Analytical model for elongation performance evaluation of corroded prestressing strands

Tae-Hoon Kim , Chang-Ho Sun , Ick-Hyun Kim

Abstract

This study examines the effects of corrosion on prestressing strands, a critical factor influencing the durability and structural safety of aging prestressed concrete structures. Considering that the repair or rehabilitation of corroded prestressing strands is difficult and expensive, early detection of signs of corrosion in prestressing strands is crucial for the effective maintenance of these structures. Corrosion-induced reductions in elongation compromise the deformation capacity and seismic performance of these structures due to the mechanical property changes caused by corrosion. Using Faraday's law, the corrosion levels of prestressing strand specimens were estimated by calculating the charges passed through a defined circuit over a specific time period. The proposed quantification technique demonstrated high effectiveness in predicting the corrosion characteristics of the strands. Monotonic tensile tests conducted on 64 accelerated corroded prestressing strand specimens provided data to develop a reduction formula for elongation, a vital mechanical property. This formula facilitated the creation of an analytical model and numerical tools capable of simulating both local and overall behavior of corroded prestressing strands.

Key Words

corrosion on prestressing strands; deformation capacity; elongation; reduction formula; seismic performance

Address

Tae-Hoon Kim — Track & Civil Infrastructure Division, Korea Railroad Research Institute, 176, Cheoldobangmulgwan-ro, Uiwang-si, Gyeonggi-do, 16105, Republic of Korea
Chang-Ho Sun, Ick-Hyun Kim — Department of Civil and Environmental Engineering, University of Ulsan, 93, Daehak-ro, Nam-gu, Ulsan-si, 44610, Republic of Korea

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