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Practical bond model for corroded RC bridges

Blomfors, Mattias; Lundgren, Karin; Ivanov, Oskar Larsson LU ; Honfi, Dániel LU and Zandi, Kamyab (2017) 2017 fib Symposium - High Tech Concrete: Where Technology and Engineering Meet In High Tech Concrete: Where Technology and Engineering Meet - Proceedings of the 2017 fib Symposium p.1793-1803
Abstract

Corrosion of steel reinforcement is a common cause of deterioration in reinforced concrete bridges and many existing bridges are damaged to varying degrees. The rate of deterioration of the bridge stock has been shown to increase due to climate change. Unsympathetically, the demand for load-carrying capacity is however often increased with time. Therefore there is an increasing need for reliable methods to assess the load-carrying capacity and remaining service-life of existing infrastructure. A simple model for the assessment of Anchorage in corroded Reinforced Concrete structures (ARC) has previously been developed. It was originally based on fib Model Code 1990 and has been verified with experiments and three-dimensional nonlinear... (More)

Corrosion of steel reinforcement is a common cause of deterioration in reinforced concrete bridges and many existing bridges are damaged to varying degrees. The rate of deterioration of the bridge stock has been shown to increase due to climate change. Unsympathetically, the demand for load-carrying capacity is however often increased with time. Therefore there is an increasing need for reliable methods to assess the load-carrying capacity and remaining service-life of existing infrastructure. A simple model for the assessment of Anchorage in corroded Reinforced Concrete structures (ARC) has previously been developed. It was originally based on fib Model Code 1990 and has been verified with experiments and three-dimensional nonlinear finite element (3D NLFE) analyses for both accelerated and natural corrosion as well as for different degrees of corrosion. The model was applied when assessing two road bridges in Sweden. The investigation demonstrated great cost savings but also areas for improvement, in particular regarding (a) applicability to practical cases and (b) incorporation of uncertainties in the assessment. The primary focal point of this paper is to present an overview of the development of the ARC model together with recent verifications against a large bond test database as well as foreseen future developments. It was found that the ARC model represents the physical behaviour reasonably well, and gives conservative values of bond strength compared to the bond tests database. In future works, among others, uncertainties of the input variables will be incorporated by means of probabilistic modelling, making way for implementation of the ARC model into semi-probabilistic safety concepts by extraction of modification factors. Overall, with more accurate and reliable assessment methods for corroded RC structures, environmental and economic savings are imminent as more of the potential of existing structures can be realized.

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Please use this url to cite or link to this publication:
author
organization
publishing date
type
Chapter in Book/Report/Conference proceeding
publication status
published
subject
keywords
Anchorage, Assessment, Bond, Existing structures, Reinforcement corrosion
in
High Tech Concrete: Where Technology and Engineering Meet - Proceedings of the 2017 fib Symposium
pages
11 pages
publisher
Springer International Publishing
conference name
2017 fib Symposium - High Tech Concrete: Where Technology and Engineering Meet
external identifiers
  • scopus:85025665990
ISBN
9783319594705
DOI
10.1007/978-3-319-59471-2_206
language
English
LU publication?
yes
id
964f9331-3355-477a-a9cf-041dc9cb5d8e
date added to LUP
2017-08-02 09:52:14
date last changed
2018-01-07 12:13:55
@inproceedings{964f9331-3355-477a-a9cf-041dc9cb5d8e,
  abstract     = {<p>Corrosion of steel reinforcement is a common cause of deterioration in reinforced concrete bridges and many existing bridges are damaged to varying degrees. The rate of deterioration of the bridge stock has been shown to increase due to climate change. Unsympathetically, the demand for load-carrying capacity is however often increased with time. Therefore there is an increasing need for reliable methods to assess the load-carrying capacity and remaining service-life of existing infrastructure. A simple model for the assessment of Anchorage in corroded Reinforced Concrete structures (ARC) has previously been developed. It was originally based on fib Model Code 1990 and has been verified with experiments and three-dimensional nonlinear finite element (3D NLFE) analyses for both accelerated and natural corrosion as well as for different degrees of corrosion. The model was applied when assessing two road bridges in Sweden. The investigation demonstrated great cost savings but also areas for improvement, in particular regarding (a) applicability to practical cases and (b) incorporation of uncertainties in the assessment. The primary focal point of this paper is to present an overview of the development of the ARC model together with recent verifications against a large bond test database as well as foreseen future developments. It was found that the ARC model represents the physical behaviour reasonably well, and gives conservative values of bond strength compared to the bond tests database. In future works, among others, uncertainties of the input variables will be incorporated by means of probabilistic modelling, making way for implementation of the ARC model into semi-probabilistic safety concepts by extraction of modification factors. Overall, with more accurate and reliable assessment methods for corroded RC structures, environmental and economic savings are imminent as more of the potential of existing structures can be realized.</p>},
  author       = {Blomfors, Mattias and Lundgren, Karin and Ivanov, Oskar Larsson and Honfi, Dániel and Zandi, Kamyab},
  booktitle    = {High Tech Concrete: Where Technology and Engineering Meet - Proceedings of the 2017 fib Symposium},
  isbn         = {9783319594705},
  keyword      = {Anchorage,Assessment,Bond,Existing structures,Reinforcement corrosion},
  language     = {eng},
  pages        = {1793--1803},
  publisher    = {Springer International Publishing},
  title        = {Practical bond model for corroded RC bridges},
  url          = {http://dx.doi.org/10.1007/978-3-319-59471-2_206},
  year         = {2017},
}