中性化と初期塩化物イオンの複合的影響を受ける場合の鉄筋腐食に関する劣化予測

Tottori, Seiichi; Miyagawa, Toyoaki

doi:10.2208/jscej.2005.802_181

Cited by 13 publications

(12 citation statements)

References 4 publications

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“…This paper only focuses on the chloride-induced corrosion (Akiyama, Frangopol, & Suzuki, 2011;Tottori and Miyagawa, 2004) (Figure 1). To predict the corrosion-induced weight loss of reinforcing steel bars, besides of the corrosion rate (propagation and acceleration stages), the time required for chloride to corrode reinforcing steel bars (initiation stage) must be simulated using equations that estimate the airborne chloride concentration, the chloride concentration on concrete surfaces and the diffusion of chloride ions.…”

Section: Model For Chloride-induced Deteriorationmentioning

confidence: 99%

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Lifetime seismic performance assessment for chloride-corroded reinforced concrete buildings

Chiu

Hsiao

2014

Structure and Infrastructure Engineering

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2015) Lifetime seismic performance assessment for chloridecorroded reinforced concrete buildings, Structure and Infrastructure Engineering: Maintenance, Management, Life-Cycle Design and Performance, 11:3, 345-362,The main aim of this paper was to build an estimating procedure based on the static nonlinear analysis (pushover analysis) such that structural engineers can evaluate the seismic performance of a deteriorating reinforced concrete (RC) building. For engineers' convenience, this paper suggests the probabilistic deterioration prediction model and the visual estimation of deterioration degree to evaluate corrosion-induced weight loss of reinforcing steel bars. In addition, flexural and shear capacity models for a corroded column or beam are proposed and verified by full-scale corroded beam specimens, allowing engineers to simulate its nonlinear mechanical behaviour. This paper incorporates these mechanical models of corroded members into the static nonlinear analysis to construct a procedure for assessing the seismic performance of a deteriorating RC building. An elementary school at Lanyu Island, Taitung, Taiwan, is used as an example and its lifetime seismic performance is identified utilising the proposed approach.

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Section: Model For Chloride-induced Deteriorationmentioning

confidence: 99%

“…In addition, according to Tottori and Miyagawa (2004), we assume that the corrosion rate in the propagation stage and former period of acceleration stage is the same. In the future, more reliable experiments or theoretical achievements can replace this assumption.…”

Section: Former Period Of Acceleration Stagementioning

confidence: 99%

Lifetime seismic performance assessment for chloride-corroded reinforced concrete buildings

Chiu

Hsiao

2014

Structure and Infrastructure Engineering

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“…In this paper, the process of corrosion of reinforcing steel due to carbonation (Fig. 2) is modeled on the basis of previous research (Tottori et al 2004).…”

Section: Deterioration Model Of Carbonationmentioning

confidence: 99%

“…In the probabilistic analysis, the carbonation coefficient and concrete cover are treated as lognormal random variables with coefficients of variation of 45% (Kawanishi et al 2006) and 20% (Kato et al 2005), respectively. sion in these two stages is assumed to be the same, and this rate is treated as a lognormal random variable with a mean equal to 0.06%/year (percentage weight loss) (Tottori et al 2004) and a coefficient of variation of 50% (Takahashi et al 2005).…”

Section: Initiation Stagementioning

confidence: 99%

“…(3) proposed in past research (Ozaki et al 2005). Based on previous research (Tottori et al 2004) and (Takahashi et al 2005), the rate of corrosion at this stage is equal to the rate of corrosion of steel without any concrete cover and is treated as a lognormal random variable with a mean equal to 0.14%/year (percentage weight loss) and coefficient of variation of 50%.…”

Section: Latter Period Of Acceleration Stagementioning

confidence: 99%

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Optimal Maintenance Plan for RC Members by Minimizing Life-Cycle Cost Including Deterioration Risk Due to Carbonation

Chiu

Noguchi

Kanematsu

2008

ACT

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This paper presents various models of deterioration due to carbonation taking into consideration uncertainty factors to estimate the initiation and the rate of corrosion and to analyze the structural capacity and serviceability of RC members, i.e. shear capacity, bending strength and width of severe cracking or spalling of columns and beams with corroded reinforcing bars, based on simple formulas formed through past experiments. Then, it goes on to propose a method for evaluating the failure and severe spalling/cracking probability during earthquakes and the deterioration risk of members in specified years from construction. Further, through application of an immune algorithm to the minimization of the life-cycle cost including deterioration risk, an optimal maintenance plan and semi-optimal solutions with a high diversity for reinforced concrete members can be found in a single analysis. Finally, a case study is conducted to establish the effectiveness of this system.

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Long‐term seismic performance of reinforced concrete bridges under steel reinforcement corrosion due to chloride attack

Fan

Nguyen

2013

Earthq Engng Struct Dyn

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SUMMARY This work presents a new seismic evaluation methodology for corroded reinforced concrete bridges on the basis of nonlinear static pushover analysis. Corrosion of steel reinforcement by chloride attack is considered. At the material level, the effects of corrosion are considered by modeling the degradation of the mechanical properties of steel reinforcement, softening of cover concrete under compression, degradation of core concrete due to confinement steel corrosion, and reduction of bond strength between concrete and steel reinforcement. At the structural level, the effects of corrosion on both flexural behavior and shear behavior, and their interaction are considered. Eleven bridges of various structural types in Taiwan that are located within 6.5 km of their nearest coastline are analyzed to identify their long‐term seismic performance. Relationships between the yield and collapse peak ground accelerations (PGAs), and service time and corrosion level are established for each bridge. Analysis results show that chloride corrosion starts in 2–32 years. The transverse steel reinforcement typically starts corroding before the longitudinal steel reinforcement, as the former has a thicker cover. Research results show that collapse PGA reduces by 0.94% or 1.23% per 10 years when the mean value plus 1 or 2 standard deviation of the collapse PGA values are considered, respectively. Therefore, we suggest increasing the design PGA from 4.70% to 6.15% for a bridge adjacent to a coastline to ensure adequate long‐term seismic performance for 50 years, the typical design life span of a regular bridge. Copyright © 2013 John Wiley & Sons, Ltd.

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中性化と初期塩化物イオンの複合的影響を受ける場合の鉄筋腐食に関する劣化予測

Cited by 13 publications

References 4 publications

Lifetime seismic performance assessment for chloride-corroded reinforced concrete buildings

Lifetime seismic performance assessment for chloride-corroded reinforced concrete buildings

Optimal Maintenance Plan for RC Members by Minimizing Life-Cycle Cost Including Deterioration Risk Due to Carbonation

Long‐term seismic performance of reinforced concrete bridges under steel reinforcement corrosion due to chloride attack

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