Evaluation Study on the Mechanical and Thermal Properties of High Strength Structural Steel at High Temperature

Kwon, In-Kyu

doi:10.7731/kifse.2013.27.3.072

Cited by 8 publications

(6 citation statements)

References 7 publications

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“…Mechanical material properties can be obtained by using high-temperature tensile tests with temperature variations. Figure 7 shows variations of mechanical material properties (Young's modulus, Poisson's ratio thermal expansion coefficient, yield stress, ultimate stress) with temperature change [40]. Using the thermal history obtained in Section 3.2 and mechanical material characteristics in Figure 7, the residual stress and welding deformation of the welded structure could be calculated using the 3D thermal elasto-plastic FEM analysis method.…”

Section: D Thermal Elasto-plastic Fe Analysismentioning

confidence: 99%

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

et al. 2023

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The construction of new renewable energy infrastructures and the development of new ocean resources continues to proceed apace. In this regard, the increasing size and capacity of offshore wind turbines demands that the size of their accompanying supporting marine structures likewise increase. The types of marine structures utilized for these offshore applications include gravity base, monopile, jacket, and tripod structures. Of these four types, monopile structures are widely used, given that they are comparatively easy to construct and more economical than other structures. However, constant exposure to harsh cyclic environmental loads can cause material deterioration or the initiation of fatigue cracks, which can then lead to catastrophic failures. In this paper, a 3D fatigue finite element analysis was performed to predict both the fatigue life and the crack initiation of a welded monopile substructure. The whole analysis was undertaken in three steps. First, a 3D non-steady heat conduction analysis was used to calculate the thermal history. Second, a thermal load was induced, as an input in 3D elastoplastic analysis, in order to determine welding residual stresses and welding deformation. Finally, the plastic strain and residual stress were used as inputs in a 3D fatigue FE analysis in order to calculate fatigue crack initiation and fatigue life. The 3D fatigue finite element analysis was based on continuum damage mechanics (CDM) and elastoplastic constitutive equations. The results obtained from the 3D fatigue finite element analysis were compared with hot spot stresses and Det Norske Veritas (DNV-GL) standards.

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Section: D Thermal Elasto-plastic Fe Analysismentioning

confidence: 99%

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

et al. 2023

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“…Materials. When the structural stabilities of beam such as deflections and reduction of maximum load capacity at high temperatures are calculated, it is essential to know an exact value of the mechanical properties at high temperatures [5][6] and the properties from SM 520 and SM 570 are shown in Table 2. These values are derived from coupon test using Korean standards [7][8].…”

Section: Analysis For Long Span Beams At High Tempereaturesmentioning

confidence: 99%

Comparative Study of Fire Resistance Performance for Long Span Beams Constructed with High Strength Submarine Structural Steels According to Boundary Conditions

Kwon

2016

KEM

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Requirements for building have been increased not only structural aspects but fire resistance. Therefore, a structural steel having higher strength has been developed and applied into building industry. Especially, a SM 520 and a SM 570 have good construction efficiencies in fabrication site and construction site, for these have a better welding performance and a higher strength than other structural steels. However, their fire resistance performance of them doesn’t clear until now. In this study, to compare the fire resistance of long span beam built with SM 520 and SM 570, a fire engineering technique was used using mechanical properties at high temperatures and analytical methods. As the structural grades are going up, the performance of fire resistance is shown to be decreased.

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“…The temperature of steel stud (an average temperature between two flanges of steel stud) was reached at 274°C after an hour from a standard fire curve. At the temperature 274°C, the yield strength and elastic modulus are 282.2 and 195,425 MPa, respectively . The mechanical properties at high temperature for light‐gauge steel used those of structural mild steels having the same yield strength at ambient temperature.…”

Section: Evaluation Of Structural Stability By Calculation At Elevatementioning

confidence: 99%

Experimental study of the fire resistance of walls and floors constructed with steel studs and steel joists

Kwon

Jee

2012

Fire and Materials

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Steel‐framed houses using light‐gauge steel as a structural member have been developed and constructed since the early 2000s as a new construction pattern in the low‐rise construction market in Korea. Generally, the steel frames consist of two major load‐carrying elements such as load‐bearing wall and floor construction made up of approximately 1.0‐mm cold‐formed light‐gauge steel and light‐weight boards. Therefore, the steel frames are very simple to construct and make the construction period shorter than the ordinary construction type or concrete‐based construction. In Korea, regardless of the construction material types, the building regulation requires 1‐h fire rating for apartment buildings of four stories or under. To meet the fire resistance, new models of load‐bearing wall and floor should be developed. From the fire test results, two layer gypsum boards of 12.5 mm in thickness reinforced with glass fiber were proven satisfactory to provide 1‐h fire resistance with load‐bearing wall and floor. Copyright © 2012 John Wiley & Sons, Ltd.

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Evaluation Study on the Mechanical and Thermal Properties of High Strength Structural Steel at High Temperature

Cited by 8 publications

References 7 publications

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

Fatigue Life and Crack Initiation in Monopile Foundation by Fatigue FE Analysis

Comparative Study of Fire Resistance Performance for Long Span Beams Constructed with High Strength Submarine Structural Steels According to Boundary Conditions

Experimental study of the fire resistance of walls and floors constructed with steel studs and steel joists

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