A framework for predicting the residual load carrying capacity of concrete structures exposed to aggressive environments

Nezamian, A and Setunge, Sujeeva and Molyneaux, Tom C. K. (2005) A framework for predicting the residual load carrying capacity of concrete structures exposed to aggressive environments. [Conference Paper]

Abstract

Reinforced concrete structures are susceptible to a variety of deterioration mechanisms due to creep and shrinkage, alkali-silica reaction (ASR), carbonation, and corrosion of the reinforcement. The deterioration problems can affect the integrity and load carrying capacity of the structure. Substantial research has been dedicated to these various mechanisms aiming to identify the causes, reactions, accelerants, retardants and consequences. This has improved our understanding of the long-term behaviour of reinforced concrete structures. However, the strengthening of reinforced concrete structures for durability has to date been mainly undertaken after expert assessment of field data followed by the development of a scheme to both terminate continuing degradation, by separating the structure from the environment, and strengthening the structure. The process does not include any significant consideration of the residual load-bearing capacity of the structure and the highly variable nature of estimates of such remaining capacity. Development of performance curves for deteriorating bridge structures has not been attempted due to the difficulty in developing a model when the input parameters have an extremely large variability. This paper presents a framework developed for an asset management system which assesses residual capacity and identifies the most appropriate rehabilitation method for a given reinforced concrete structure exposed to aggressive environments. In developing the framework, several industry consultation sessions have been conducted to identify input data required, research methodology and output knowledge base. Capturing expert opinion in a useable knowledge base requires development of a rule based formulation, which can subsequently be used to model the reliability of the performance curve of a reinforced concrete structure exposed to a given environment.

Additional Information

Item Type: Conference Paper
Collection: CRC for Construction Innovation
Keywords: CRC for Construction Innovation; Program C : Delivery Management of Built Assets; Project 2004-018-C : Sustainable Infrastructure for Aggressive Environments
Date Deposited: 11 Mar 2014 03:16
Last Modified: 11 Mar 2014 03:20
Copyright Owner: Copyright 2005 Icon.Net Pty Ltd
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URI: http://digitalcollections.qut.edu.au/id/eprint/1847
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