In-Service Degradation of Structural Steels (A Survey)

Zvirko, Olha

doi:10.1007/s11003-021-00547-w

Cited by 16 publications

(5 citation statements)

References 50 publications

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“…The amount of demolition and construction waste also can be reduced during underground space development for urban regeneration and sustainability. However, plastic deformation of steel pipes can increase sensitivity to corrosion [27]. In addition, the increasing degree of bearing capacity in the expanded steel pipe pile was slightly lower than those of other improved micropiles.…”

Section: Discussionmentioning

confidence: 88%

Development of Expanded Steel Pipe Pile to Enhance Bearing Capacity

Kim

Min³

et al. 2022

Sustainability

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An expanded steel pipe pile increases the cross-sectional area of conventional micropile by expanding the steel pipe to exhibit a higher bearing capacity owing to increased frictional resistance. However, construction cases of the expanded steel pipe pile are insufficient due to the absence of equipment for expanding steel pipes inside the ground. In this study, hydraulic expansion equipment was developed to verify the reinforcing impact on the bearing capacity and field applicability of the expanded steel pipe pile. A series of laboratory and test bed experiments was conducted to measure the expansion time and deformation of carbon steel pipes by using the developed equipment. The results of these experiments demonstrated that the developed equipment has sufficient ability and constructability to be used in the field for constructing expanded steel pipe piles. Then, field load tests were performed by constructing expanded and conventional steel pipe piles to confirm the improved bearing capacity of the expanded steel pipe pile compared to that of the conventional micropile. As a result, the expanded steel pipe pile exhibited a 20.88% increase in bearing capacity compared to that of the conventional steel pipe pile.

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Section: Discussionmentioning

confidence: 88%

Development of Expanded Steel Pipe Pile to Enhance Bearing Capacity

Kim

Min³

et al. 2022

Sustainability

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“…Since the degradation of metal manifests itself firstly in the drop of brittle fracture resistance due to the realization of a less energy-consuming fracture mechanism [33,35,[37][38][39], impact toughness as a measure of the resistance to brittle fracture has been evaluated for the metal from both tested crane sections. Standard specimens 10 mm × 10 mm × 55 mm with a V-type notch for impact toughness testing were cut out from crane sections in longitudinal (L-T, direction of the global crack propagation was transverse) and transverse (T-L, the crack was propagated in longitudinal direction) directions relative to the plate processing geometry.…”

Section: Materials and Testing Methodsmentioning

confidence: 99%

“…In addition, operational degradation of structural steels [31][32][33][34][35][36][37][38][39][40] should also be taken into account. It is well-known that the long-term operation of steels often leads to a significant loss of the mechanical properties that ensure the serviceability of the material under certain loading conditions.…”

Section: Introductionmentioning

confidence: 99%

“…Steel degradation manifests itself in a significant deterioration of impact toughness, and the higher the stress level, the lower the resistance to brittle fracture. For the rolled steels, cohesive strength between the matrix and non-metallic inclusions, elongated in the rolling direction, significantly reduces during operation [35,37]. It leads to enhancing the anisotropy of plasticity and the resistance to brittle fracture.…”

Section: Introductionmentioning

confidence: 99%

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Specimen Size Effect on the Tensile Properties of Rolled Steel of Long-Term-Operated Portal Crane

et al. 2023

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This paper presents the research results on the mechanical behavior of the low-carbon rolled steel of a sea portal crane after a 33-year operation depending on the operational stresses and rolling direction in order to assess its serviceability. The tensile properties of steels were investigated using rectangular cross-section specimens with different thicknesses and the same width. Strength indicators were slightly dependent on the considered factors (operational conditions, the cutting direction, and thickness of specimens). However, a clear trend of higher ultimate strength for thinner specimens was noticed, especially in the case of more brittle material due to its operational degradation. Plasticity of the tested steel specimens was more sensitive to the influence of the above-mentioned factors than strength but less sensitive than impact toughness. Uniform elongation was slightly less for thinner specimens regardless of the investigated steel state or the orientation of specimens relative to the rolling direction. The post-necking elongation was lower for transversal specimens compared with longitudinal ones, and the effect was more significant when testing steel with the lowest brittle fracture resistance. Among the tensile properties, non-uniform elongation was demonstrated to be the most effective for assessing the operational changes in the state of rolled steels.

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“…Factors determining the plugging mechanism include: hammer-pile impact, construction disturbance (driven pile or jacked pile), pile diameter, pile length to diameter ratio, mechanical soil properties, and friction at the soil-pile interface [22][23][24][25][26]. There are also studies focusing on the potential corrosion of steel materials in long-term service life [27].…”

Section: Introductionmentioning

confidence: 99%

Experimental Study on Load-Carrying Behavior of Large Open-Ended Pipe Pile in Cohesionless Soils

Guo

2022

Sustainability

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Large-diameter open-ended pipe piles typically refer to pipe piles with diameters larger than 0.91 m. These piles, when properly designed and constructed, could provide high load-carrying capacity against axial loading, uplift, and overturning in the offshore environment. The current American Association of State Highway and Transportation Officials (AASHTO) specification for pipe piles is based on the database collected from piles with diameters less than 0.61 m and is, therefore, insufficient for the design of large-diameter open-ended pipe piles. This paper introduces an experimental program to investigate the static load-carrying behavior of open-ended pipe piles. Two types of restriction plates, i.e., one-hole plate and four-hole plate, were designed and installed inside the pipe to study their influence on the loading bearing behavior. Beside the laboratory-scale pile experiments, the testing program was augmented with geotechnical centrifuge experiments, which upscale the dimensions of model piles close to the size used at the field scale. The combined laboratory and geotechnical centrifuge experiments help to analyze the load-carrying behavior of pipe piles with different pile diameters, types of restriction plate, and embedment depths. The experimental results indicate that the formation of a soil plug is crucial to mobilize the bearing capacity of pipe piles. The restriction plate helps to form the soil plugging, which leads to a higher end bearing capacity. The selection of types of restriction plate should be determined on a case-by-case basis with considerations of mechanical performance and pile drivability.

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In-Service Degradation of Structural Steels (A Survey)

Cited by 16 publications

References 50 publications

Development of Expanded Steel Pipe Pile to Enhance Bearing Capacity

Development of Expanded Steel Pipe Pile to Enhance Bearing Capacity

Specimen Size Effect on the Tensile Properties of Rolled Steel of Long-Term-Operated Portal Crane

Experimental Study on Load-Carrying Behavior of Large Open-Ended Pipe Pile in Cohesionless Soils

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