Estimation on deterioration process model of concrete structure received chloride induced damage with considering repeated repairing

2014 ◽  
pp. 1237-1242
Author(s):  
M Matsushima ◽  
K Matsuda ◽  
M Yokota
Keyword(s):  
Concrete Structure ◽  
Process Model ◽  
Deterioration Process

scholarly journals MULTIDIMENSIONAL INFRASTRUCTURE DETERIORATION PROCESS MODEL

2016 ◽  
Vol 72 (1) ◽  
pp. 34-51
Author(s):  
Daijiro MIZUTANI ◽  
Kengo OBAMA ◽  
Kiyoyuki KAITO ◽  
Kiyoshi KOBAYASHI
Keyword(s):  
Process Model ◽  
Deterioration Process

scholarly journals Time-dependent Reliability Analysis of Timber-Concrete Composite Beams

2017 ◽  
Author(s):  
Nikola Velimirovic ◽  
Dragoslav Stojić ◽  
Miodrag Djordjević ◽  
Gordana Topličić-Ćurčić
Keyword(s):  
Reliability Analysis ◽  
Process Model ◽  
Composite System ◽  
Random Variable ◽  
Composite Beams ◽  
Time Dependent ◽  
Deterioration Rate ◽  
Time Period ◽  
Deterioration Process ◽  
Service Life Estimation

Timber-concrete composite system is increasing the use of timber in construction because some structures could not be built by timber alone, but it becomes possible with this composite system. The deterioration of structures in service is generally uncertain over time, therefore the appropriate approach for the structural analysis is a time-dependent reliability analysis that considers the randomness and uncertainties of deterioration process over a time period. This paper describes two methods for time dependent reliability analysis, random variable deterioration rate model and gamma process model, and compares the deterioration prediction as well as service life estimation of timber-concrete composite beams under normal use based on proposed models.

scholarly journals Assessment on the Technical State of Spillway Concrete Gravity Dams in Lithuania

2021 ◽  
Vol 28 (1) ◽  
pp. 106-117
Author(s):  
Raimondas Šadzevičius ◽  
Rytis Skominas ◽  
Algirdas Radzevičius
Keyword(s):  
Concrete Structure ◽  
Protective Layer ◽  
Technical State ◽  
Reinforcement Corrosion ◽  
Gravity Dams ◽  
Concrete Corrosion ◽  
State Research ◽  
Concrete Gravity Dams ◽  
State Evaluation ◽  
Deterioration Process

Spillway concrete gravity dams are exposed by loads and environment causing deterioration process. The article presents the concrete structure deteriorations, defects and technical state evaluation results of 34 Lithuanian spillway concrete gravity dams performed in 2006–2018. The typical deteriorations are: in piers’– crumbled protective layer of concrete, its corrosion, reinforcement corrosion, cracks in concrete, chipped edges; in spillway constructions’– concrete corrosion, bio–corrosion, concrete corrosion caused by cavitation; in outflow constructions – concrete corrosion, bigger cracks and deformations. According to results of technical state research, it was found that only 3% (1 SCGD) dams are in good technical state, 27% (9 SCGD) – moderate, 47% (16 SCGD) – satisfactory, 12% (4 SCGD) – unsatisfactory and 12% (4 SCGD) – in critical state.

Reduction of Seismic Risk of Infrastructure via Daily Management Works

2019 ◽  
Author(s):  
Daijiro Mizutani
Keyword(s):  
Markov Process ◽  
Seismic Risk ◽  
Process Model ◽  
External Factors ◽  
Management Policy ◽  
Earthquake Risk ◽  
Optimal Management ◽  
Markov Process Model ◽  
Deterioration Process ◽  
Infrastructure Failure

<p>During recent years, the possibility that damage at the time of earthquake could change depending on the deterioration condition of infrastructure has been noted through analytical calculations. Faced with such a possibility, management policy should be optimized by internalizing the external elements of earthquake damage, evaluating the appropriateness of management policy for infrastructure, and optimizing the system. In this study, the deterioration process for infrastructure was modelled using the Markov process model, and a methodology to determine the optimal management policy is proposed by considering the two risks: i) the risk that infrastructure fails because of deterioration independent of external factors such as an earthquake, and ii) the risk of infrastructure failure at the time of earthquake, which changes due to deterioration of the infrastructure. In an example of the application, it is demonstratively shown that the optimal management policy would change in the case where earthquake risk is not considered.</p>

scholarly journals Variability in an Optimal Infrastructure Management Policy by Internalization of Seismic Risk

2018 ◽  
Vol 13 (6) ◽  
pp. 1062-1071
Author(s):  
Daijiro Mizutani ◽  
Keyword(s):  
Seismic Risk ◽  
Process Model ◽  
Management Policy ◽  
Earthquake Risk ◽  
Infrastructure Management ◽  
Optimal Management ◽  
Occurrence Probability ◽  
Earthquake Occurrence ◽  
Markov Process Model ◽  
Deterioration Process

During recent years, the possibility that damage at the time of earthquake could change depending on the deterioration condition of infrastructure has been noted through analytical analyses. Faced with such a possibility, management policy should be optimized by internalizing the external elements of earthquake damage, evaluating the appropriateness of management policy for infrastructure, and optimizing the system. In this study, the deterioration process for infrastructure was modelled using the Markov process model, and a methodology to determine the optimal management policy is proposed by considering the two risks: i) the risk that infrastructure fails because of deterioration independent of external elements such as an earthquake, and ii) the risk that changes due to deterioration fails the infrastructure at the time of earthquake. Using an example of the application the following two points are demonstratively shown: i) the optimal management policy would change in the case in which earthquake risk is not considered, and ii) the optimal management policy would change depending on the earthquake occurrence probability in the case in which earthquake risk is considered.

Durability Evaluation of Concrete Structure Based on Fuzzy Extension AHP

2013 ◽  
Vol 454 ◽  
pp. 179-182
Author(s):  
Ya Na Zhang ◽  
Yan Liu
Keyword(s):  
Concrete Structure ◽  
Process Model ◽  
Evaluation Method ◽  
Comprehensive Evaluation ◽  
Fuzzy Comprehensive Evaluation ◽  
Concrete Durability ◽  
Ahp Method ◽  
Analytic Hierarchy ◽  
Comprehensive Evaluation Method ◽  
Hierarchy Process

In the paper, Fuzzy extension AHP(Analytic Hierarchy Process) model is proposed to evaluate concrete structure durability, according to the concrete durability indexes are multiple-levels, multiple-factors and fuzzy. In the method, the extension interval judgment matrix is applied to calculated the weight of every durability index, at the same time the fuzzy comprehensive evaluation method is used which can obtain every evaluate grade level by level, therefore the ultimate evaluation result is obtained. The fuzzy extension AHP method is applied in the office building of the third rolling mill of Ma'anshan steel company. The analysis result shows that the fuzzy extension AHP method is more scientific, comprehensive, accurate and convenient than the traditional AHP method, which can evaluate the durability of concrete structure effectively.

Process \'prǎ|,ses\n: The Action of Moving Forward Progressively from One Point to Another on the Way to Completion

1979 ◽  
Vol 44 (1) ◽  
pp. 3-30 ◽  
Author(s):  
Carol A. Pruning
Keyword(s):  
Process Model ◽  
Communicative Behaviors ◽  
Adult Level ◽  
Remedial Programs ◽  
Stage Process ◽  
The Way

A rationale for the application of a stage process model for the language-disordered child is presented. The major behaviors of the communicative system (pragmatic-semantic-syntactic-phonological) are summarized and organized in stages from pre-linguistic to the adult level. The article provides clinicians with guidelines, based on complexity, for the content and sequencing of communicative behaviors to be used in planning remedial programs.

Sign in / Sign up

Export Citation Format

Share Document