Probabilistic methods for performance based service life evaluation of wooden components

2011 ◽  
pp. 1335-1342 ◽  
Author(s):  
S Thelandersson ◽  
T Isaksson ◽  
M Häglund ◽  
E Frühwald
Keyword(s):  
Service Life ◽  
Probabilistic Methods ◽  
Life Evaluation

scholarly journals Service Life Evaluation for RC Sewer Structure Repaired with Bacteria Mixed Coating: Through Probabilistic and Deterministic Method

Materials ◽  
2021 ◽  
Vol 14 (18) ◽  
pp. 5424
Author(s):  
Hyun-Sub Yoon ◽  
Keun-Hyeok Yang ◽  
Kwang-Myong Lee ◽  
Seung-Jun Kwon
Keyword(s):  
Surface Roughness ◽  
Service Life ◽  
Coating Thickness ◽  
Probabilistic Method ◽  
Probabilistic Methods ◽  
Ion Concentration ◽  
Design Parameters ◽  
Deterministic Method ◽  
Repair Mortar ◽  
Life Evaluation

Since a concrete structure exposed to a sulfate environment is subject to surface ion ingress that yields cracking due to concrete swelling, its service life evaluation with an engineering modeling is very important. In this paper, cementitious repair materials containing bacteria, Rhodobacter capsulatus, and porous spores for immobilization were developed, and the service life of RC (Reinforced Concrete) structures with a developed bacteria-coating was evaluated through deterministic and probabilistic methods. Design parameters such protective coating thickness, diffusion coefficient, surface roughness, and exterior sulfate ion concentration were considered, and the service life was evaluated with the changing mean and coefficient of variation (COV) of each factor. From service life evaluation, more conservative results were evaluated with the probabilistic method than the deterministic method, and as a result of the analysis, coating thickness and surface roughness were derived as key design parameters for ensuring service life. In an environment exposed to an exterior sulfate concentration of 200 ppm, using the deterministic method, the service life was 17.3 years without repair, 19.7 years with normal repair mortar, and 29.6 years with the application of bacteria-coating. Additionally, when the probabilistic method is applied in the same environment, the service life was changed to 9.2–16.0 years, 10.5–18.2 years, and 15.4–27.4 years, respectively, depending on the variation of design parameters. The developed bacteria-coating technique showed a 1.47–1.50 times higher service life than the application of normal repair mortar, and the effect was much improved when it had a low COV of around 0.1.

Analysis on Concrete Neutralization and Life Evaluation of Reinforced Concrete Chimney

2013 ◽  
Vol 671-674 ◽  
pp. 1672-1675
Author(s):  
Yan Hui Li ◽  
Yang Yang Zhang ◽  
Jing Cun Wei ◽  
Yun Feng Wu
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Concrete Structure ◽  
Concrete Cover ◽  
Initiation Time ◽  
Reinforcement Corrosion ◽  
Single Factor ◽  
Routine Examination ◽  
Life Evaluation ◽  
Reinforced Concrete Chimney

Through calculation and analysis on routine examination and neutralization of reinforced concrete chimney, the service life of concrete structure was evaluated only considering neutralization of concrete single factor. The results show that the neutralization of the reinforced concrete chimney was serious than that of other similar projects. The initiation time of reinforcement corrosion were 19.3a, cracking time of concrete cover were 27.35a.

scholarly journals FATIGUE SERVICE LIFE EVALUATION OF EXISTING STEEL AND CONCRETE BRIDGES

2015 ◽  
pp. 305-321 ◽  
Author(s):  
Chun-sheng Wang ◽  
◽  
Mu-sai Zhai ◽  
Lan Duan ◽  
Qian Wang ◽  
...  
Keyword(s):  
Service Life ◽  
Concrete Bridges ◽  
Life Evaluation

scholarly journals Service Life Prediction and Lateral Bearing Capacity Analysis of Piles Considering Coupled Corrosion-Temperature Deterioration Processes

2021 ◽  
Vol 9 (6) ◽  
pp. 614
Author(s):  
Yue Li ◽  
Youliang Chen ◽  
Wei Shao ◽  
Juhui Zhang ◽  
Shaoming Liao ◽  
...  
Keyword(s):  
Reinforced Concrete ◽  
Service Life ◽  
Bearing Capacity ◽  
Chloride Concentration ◽  
Probabilistic Methods ◽  
Stiffness Degradation ◽  
Chloride Diffusion ◽  
Capacity Analysis ◽  
Chloride Diffusion Coefficient ◽  
Degradation Coefficient

High temperatures can enhance the chloride diffusion coefficient and this poses a threat to reinforced concrete (RC) piles. This study intends to propose predictive models that can evaluate the service life and lateral bearing behaviour of reinforced concrete piles subjected to marine environments and varying temperatures. The models show that temperature can accelerate the diffusion rate of chloride and increase the concentration of free chloride in concrete. The distribution law of chloride concentration is obtained by considering the ageing effect as well. Deterministic and probabilistic models are proposed to assess the time to corrosion initiation and propagation. The stiffness degradation coefficient is introduced in the analysis of the lateral bearing capacity of RC piles. The results show that high temperature can decrease the service life of piles and the life spans obtained from deterministic and probabilistic methods are similar; however, the predictions of the latter are more conservative. Temperature can enhance the current density and boost corrosion products, which leads to pile cracking. The rust appearing on the steel surface would make the stiffness degradation coefficient drop sharply. The lateral bearing capacity analysis is conducted from the perspectives of shear force, displacement and bearing moment of the piles.

scholarly journals Exploring the Emerging Evolution Trends of Probabilistic Service Life Prediction of Reinforced Concrete Structures in the Chloride Environment by Scientometric Analysis

2021 ◽  
Vol 2021 ◽  
pp. 1-14
Author(s):  
Junzhi Zhang ◽  
Meng Wang ◽  
Xiaoyun Zhou ◽  
Weilong Yu ◽  
Yanhong Gao ◽  
...  
Keyword(s):  
Service Life ◽  
Life Prediction ◽  
Service Life Prediction ◽  
Structural Safety ◽  
Scientometric Analysis ◽  
Multiple Parameters ◽  
Corrosion Initiation ◽  
Life Evaluation ◽  
Reliability Method ◽  
Chloride Environment

To reveal the global picture and emerging evolution trends with sufficiently large literature data of RC structure’s service life prediction, especially the time to corrosion initiation, the scientometric analysis on the corresponding evolution trends was performed by using visualization software CiteSpace and VOSviewer in this paper. First, the application of CiteSpace and VOSviewer and retrieval strategy for data collection were described. And then, information visualization analysis was carried out based on the papers related to RC structure’s service life evaluation from publications number evolution, journal distribution, and authors’ contribution. Finally, document cocitation network, cooccurring keywords network, and timeline view of keywords network were conducted to discuss the research hotspots on time to corrosion initiation evaluation of reinforcement. Research results reveal that the number of publications on RC structure’s service life evaluation reached its peak in 2011. Besides, Structural Safety is the journal that makes the most significant contributions, and Professor Li CQ is the author with the most contribution score. Moreover, the knowledge body of the time to corrosion initiation prediction consists of six clusters; the high-citation articles in this field mainly focus on the multiple-parameters model and probabilistic reliability method.

A Service Life Prediction for Waste Disposal Facility Concrete Exposed to Chloride Attack

2012 ◽  
Vol 486 ◽  
pp. 284-288
Author(s):  
Do Gyeum Kim ◽  
Hae Ryong Jung ◽  
Ki Jung Kwon ◽  
Jang Hwa Lee ◽  
Ki Beom Kim
Keyword(s):  
Service Life ◽  
Waste Disposal ◽  
Concrete Structure ◽  
Life Prediction ◽  
Service Life Prediction ◽  
Freezing And Thawing ◽  
Disposal Facility ◽  
Life Evaluation ◽  
Chloride Attack

The concrete life was shown very differently according to the conditions surrounding the structure. Because the silo concrete structure (waste disposal facility) is geomorphologically located to underground-130m below at coast, the chloride injury rather than freezing and thawing as the more important factor for the service life evaluation. In this study, the service life of silo concrete was evaluated based on the results of chloride attack

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