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RISS 인기검색어
- 검색키워드
- 저자 : Jaya Nepal (검색결과 5 건)
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Risk-based optimum repair planning of corroded reinforced concrete structures
Nepal, Jaya,Chen, Hua-Peng Techno-Press 2015 Structural monitoring and maintenance Vol.2 No.2
Civil engineering infrastructure is aging and requires cost-effective maintenance strategies to enable infrastructure systems operate reliably and sustainably. This paper presents an approach for determining risk-cost balanced repair strategy of corrosion damaged reinforced concrete structures with consideration of uncertainty in structural resistance deterioration. On the basis of analytical models of cover concrete cracking evolution and bond strength degradation due to reinforcement corrosion, the effect of reinforcement corrosion on residual load carrying capacity of corroded reinforced concrete structures is investigated. A stochastic deterioration model based on gamma process is adopted to evaluate the probability of failure of structural bearing capacity over the lifetime. Optimal repair planning and maintenance strategies during the service life are determined by balancing the cost for maintenance and the risk of structural failure. The method proposed in this study is then demonstrated by numerical investigations for a concrete structure subjected to reinforcement corrosion. The obtained results show that the proposed method can provide a risk cost optimised repair schedule during the service life of corroded concrete structures.
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Load bearing capacity reduction of concrete structures due to reinforcement corrosion
Huapeng Chen,Jaya Nepal 국제구조공학회 2020 Structural Engineering and Mechanics, An Int'l Jou Vol.75 No.4
Reinforcement corrosion is one of the major problems in the durability of reinforced concrete structures exposed to aggressive environments. Deterioration caused by reinforcement corrosion reduces the durability and the safety margin of concrete structures, causing excessive costs in managing these structures safely. This paper aims to investigate the effects of reinforcement corrosion on the load bearing capacity deterioration of the corroded reinforced concrete structures. A new analytical method is proposed to predict the crack growth of cover concrete and evaluate the residual strength of concrete structures with corroded reinforcement failing in bond. The structural performance indicators, such as concrete crack growth and flexural strength deterioration rate, are assumed to be a stochastic process for lifetime distribution modelling of structural performance deterioration over time during the life cycle. The Weibull life evolution model is employed for analysing lifetime reliability and estimating remaining useful life of the corroded concrete structures. The results for the worked example show that the proposed approach can provide a reliable method for lifetime performance assessment of the corroded reinforced concrete structures.
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Chen, Hua-Peng,Nepal, Jaya Techno-Press 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.2
Life cycle performance of corrosion affected RC structures is an important and challenging issue for effective infrastructure management. The accurate condition assessment of corroded RC structures mainly depends on the effective evaluation of deterioration occurring in the structures. Structural performance deterioration caused by reinforcement corrosion is a complex phenomenon which is generally uncertain and non-decreasing. Therefore, a stochastic modelling such as the gamma process can be an effective tool to consider the temporal uncertainty associated with performance deterioration. This paper presents a time-dependent reliability analysis of corrosion affected RC structures associated bond strength degradation. Initially, an analytical model to evaluate cracking in the concrete cover and the associated loss of bond between the corroded steel and the surrounding cracked concrete is developed. The analytical results of cover surface cracking and bond strength deterioration are examined by experimental data available. Then the verified analytical results are used for the stochastic deterioration modelling, presented here as gamma process. The application of the proposed approach is illustrated with a numerical example. The results from the illustrative example show that the proposed approach is capable of assessing performance of the bond strength of concrete structures affected by reinforcement corrosion during their lifecycle.
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Effect of cover cracking on reliability of corroded reinforced concrete structures
Hua-Peng Chen,Jaya Nepal 사단법인 한국계산역학회 2017 Computers and Concrete, An International Journal Vol.20 No.5
The reliability of reinforced concrete structures is frequently compromised by the deterioration caused by reinforcement corrosion. Evaluating the effect caused by reinforcement corrosion on structural behaviour of corrosion damaged concrete structures is essential for effective and reliable infrastructure management. In lifecycle management of corrosion affected reinforced concrete structures, it is difficult to correctly assess the lifecycle performance due to the uncertainties associated with structural resistance deterioration. This paper presents a stochastic deterioration modelling approach to evaluate the performance deterioration of corroded concrete structures during their service life. The flexural strength deterioration is analytically predicted on the basis of bond strength evolution caused by reinforcement corrosion, which is examined by the experimental and field data available. An assessment criterion is defined to evaluate the flexural strength deterioration for the time-dependent reliability analysis. The results from the worked examples show that the proposed approach is capable of evaluating the structural reliability of corrosion damaged concrete structures.
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Hua-Peng Chen,Jaya Nepal 국제구조공학회 2015 Structural Engineering and Mechanics, An Int'l Jou Vol.54 No.2
Life cycle performance of corrosion affected RC structures is an important and challengingissue for effective infrastructure management. The accurate condition assessment of corroded RC structuresmainly depends on the effective evaluation of deterioration occurring in the structures. Structuralperformance deterioration caused by reinforcement corrosion is a complex phenomenon which is generallyuncertain and non-decreasing. Therefore, a stochastic modelling such as the gamma process can be aneffective tool to consider the temporal uncertainty associated with performance deterioration. This paperpresents a time-dependent reliability analysis of corrosion affected RC structures associated bond strengthdegradation. Initially, an analytical model to evaluate cracking in the concrete cover and the associated lossof bond between the corroded steel and the surrounding cracked concrete is developed. The analytical resultsof cover surface cracking and bond strength deterioration are examined by experimental data available. Thenthe verified analytical results are used for the stochastic deterioration modelling, presented here as gammaprocess. The application of the proposed approach is illustrated with a numerical example. The results fromthe illustrative example show that the proposed approach is capable of assessing performance of the bondstrength of concrete structures affected by reinforcement corrosion during their lifecycle.
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