Degradation Characteristic of Concrete Members of Japanese Highway Bridges Based on Periodic Inspection Data

Tamakoshi, Takashi; Yokoi, Yoshiteru; Ishio, Mari

doi:10.3151/crt.25.167

Cited by 10 publications

(4 citation statements)

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“…Fifteen years after construction, half bridges are classified as grade C or E, which require repair owing to deterioration regardless of bridge type. This degradation speed is much higher than the average in the whole country as reported in a previous research 2) . Although durability was considered in designing these bridges, problems remain in the durability of the current design and construction work.…”

Section: (2) Deterioration Of Reinforced Concrete (Rc) Slabcontrasting

confidence: 55%

Multiple Protection Design for Durable Concrete Bridge Deck in Cold Regions

et al. 2017

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"Reconstruction Roads" are the highways constructed to accelerate recovery from the Great East Japan earthquake that occurred in 2011. The total distance of Reconstruction Roads is approximately 360 km, which includes more than 250 bridges. Because Reconstruction Roads are located in a cold zone, durability against frost attack is necessary for their concrete structures. In addition to freezing and thawing effects, bridges also suffer from alkali silica reaction (ASR) and chloride attack from the use of deicing salt.During the construction of a reinforced concrete (RC) slab of the "Mukai sada-nai Bridge," we designed the concrete and reinforcing materials to be durable. A multiple defense strategy is a key phrase in our durability design. To prevent possible deterioration, at least two countermeasures were applied. The use of fly ash is a core countermeasure because it is effective against both ASR and chloride attack. Air content was designed at 6% to achieve antifrost performance. An expansive agent was also used to reduce the risk of shrinkage cracks. Epoxy-coated reinforcing bars were used to resist corrosion. An RC slab was carefully constructed at the Mukai sada-nai Bridge. Wet curing continued for three months to obtain a pozzolanic reaction. The quality of the hardened concrete was checked by element tests and nondestructive tests. Additional costs to enhance durability were acceptable with regard to risk control. Success at the Mukai sada-nai Bridge was followed by the construction of other durable RC bridge decks on Reconstruction Roads.

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Section: (2) Deterioration Of Reinforced Concrete (Rc) Slabcontrasting

confidence: 55%

Multiple Protection Design for Durable Concrete Bridge Deck in Cold Regions

et al. 2017

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“…For formulating a long-term maintenance plan, it is necessary to evaluate the soundness through regular inspections of the currently managed bridges and to predict future deteriorations, which is the focus of several quantitative evaluation studies. Tamakoshi et al 2,3) conducted a detailed analysis of bridge inspection results recorded by the respective Regional Development Bureaus of the Ministry of Land, Infrastructure, Transport, and Tourism to grasp the overall trend of deterioration in the main members of concrete and steel bridges. Tsuda et al 4) developed a new deterioration prediction method using the bridge soundness recorded as discrete values.…”

Section: Previous Studies 121 Analysis Of Bridge Inspection Resultsmentioning

confidence: 99%

“…These bridge specifications and inspection results have been analyzed in a previous study. 2,3) However, evaluating the soundness of bridges varies depending on the parameters and construction methods. Bridge soundness is evaluated differently by the respective municipalities based on the bridge life-extending repair plan.…”

Section: Position Of This Studymentioning

confidence: 99%

Analysis on the Utilization of Opinion of Bridge Inspection Results Using Topic Model for Maintenance and Management

Ogawa

Chikata

2020

Mater. Trans.

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Utilization of collected and accumulated data of bridge inspection results is required for maintenance. Although the qualitative evaluation items of bridges have frequently been used in the past, this research focuses on the opinions of technical experts during bridge inspection. Topic models consist of probabilistic modeling of term frequency occurrences in documents, which can be used to classify documents containing opinions of bridge inspections. A topic model can be applied to the text data to detect the characteristics of bridge damage not recorded as database evaluation items. The topics corresponding to the characteristic damage condition of the bridge can then be organized. In this study, topics have been organized by high probability words about deterioration due to ASR (Alkali-Silica Reaction), which is a characteristic deterioration in the Hokuriku region. By focusing on the opinions from bridge inspections associated with high probability topics, early detection and preventative maintenance are possible. Although effective results were obtained, some topics were organized by the characteristic writing of the inspection company. This means that in order to accumulate the inspection data while maintaining quality, it is necessary to consider the method and writing style that was used in creating the contents of the opinion in the bridge inspection report.

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“…Usukura et al [21] collected ten corrosion patterns previously identified in studies [1,6,25] for the Igirder end. The corrosion patterns denoted as G1-G5 [21] are predicted by examining corroded steel bridges as described in the referenced research [26]. This strength analysis will review several variables, as described in Table 4.…”

Section: Study Case Analysismentioning

confidence: 99%

An Efficient Framework for Optimization of Nonlinear Steel Trusses With Continuous Variables Using Lightgbm

Nguyen

2024

GEOMATE

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Corrosion may cause uniform or localized deterioration to steel bridges, which could gradually diminish carrying capacity as the damage worsens. Carbon fiber reinforced polymer (CFRP) has immense promise due to its low weight and excellent durability, elasticity, and strength. This paper investigates the effectiveness of CFRP as a repair for corroded steel I-girder ends in terms of shear and end-bearing capacities. First, this study presents finite element validation of corrosion and CFRP modeling; based on the result, the setting and analysis process can be implemented in the case study. Then, the simulation of five cases of uniform corrosion involves a range of corrosion damage situations, encompassing corrosion heights, widths, and thickness loss. The stiffener, end web, and inner web simulate the corroded part. Finite element analysis (FEA) uses nonlinearity buckling analysis and assigns the Shell S4R element type steel. The constitutive isotropic elastic model is applied to steel, while CFRP utilizes an orthotropic lamina. The CFRP failure pattern uses the Hashin Damage Criterion model constitutive. Three layers are applied to each side of the model. Analysis shows CFRP in stiffener corroded area significantly increases remaining shear capacity by 0-11.8% for one side and 0-19% for both sides, in bearing capacity by 0-8.4% and 0-17.3%, respectively. Its efficacy in end-bearing is 0-6.3% in the end web, inner web, and combination areas. End web shear capacity increased slightly, while inner and combination web capacity decreased by 0-2% from the health model.

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Degradation Characteristic of Concrete Members of Japanese Highway Bridges Based on Periodic Inspection Data

Cited by 10 publications

References 0 publications

Multiple Protection Design for Durable Concrete Bridge Deck in Cold Regions

Multiple Protection Design for Durable Concrete Bridge Deck in Cold Regions

Analysis on the Utilization of Opinion of Bridge Inspection Results Using Topic Model for Maintenance and Management

An Efficient Framework for Optimization of Nonlinear Steel Trusses With Continuous Variables Using Lightgbm

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