Spatial Variability of Rebar Corrosion and Performance Evaluation of Corroded RC Structures Using Probabilistic Analysis and Finite Element Method

Mitsuyoshi Akiyama*, Dan M. Frangopol, Mingyang Zhang

*この研究の対応する著者

研究成果: Conference contribution

抄録

Corrosion of steel reinforcement is spatially distributed over RC structures due to several factors such as different environmental exposure, concrete quality and cover. Ignoring the effect of spatial variability is a drastic simplification for the prediction of the remaining service life of RC structures. Therefore, it is essential to identify the parameters influencing the spatial steel corrosion and structural performance of corroded RC structures. In this paper, an experimental research was conducted to study the effects of current density, concrete cover, rebar diameter, and fly ash on the spatial variability of steel weight loss, corrosion crack, and structural behavior of corroded RC beams using X-ray and digital image processing technique. The test results showed that low current density induced highly non-uniform corrosion associated with few large pits and cracks at certain locations while higher current density produced more uniform corrosion and cracks occurred over the whole beam. Gumbel distribution parameters were derived from the experimental data of steel weight loss to model spatial steel corrosion. A novel approach was established to assess the reliability of RC structures using finite element analysis and probabilistic simulation considering the spatial variability in steel weight loss. Using the Gumbel distribution parameters derived from the steel weight loss data associated with higher current density may underestimate the non-uniformity of corrosion distribution which can lead to an overestimation of the load capacity of corroded RC structures.

本文言語English
ホスト出版物のタイトル18th International Probabilistic Workshop, IPW 2020
編集者José C. Matos, Paulo B. Lourenço, Daniel V. Oliveira, Jorge Branco, Dirk Proske, Rui A. Silva, Hélder S. Sousa
出版社Springer Science and Business Media Deutschland GmbH
ページ733-739
ページ数7
ISBN(印刷版)9783030736156
DOI
出版ステータスPublished - 2021
イベント18th International Probabilistic Workshop, IPW 2020 - Virtual, Online
継続期間: 2021 5 122021 5 14

出版物シリーズ

名前Lecture Notes in Civil Engineering
153 LNCE
ISSN(印刷版)2366-2557
ISSN(電子版)2366-2565

Conference

Conference18th International Probabilistic Workshop, IPW 2020
CityVirtual, Online
Period21/5/1221/5/14

ASJC Scopus subject areas

  • 土木構造工学

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