Investigation of the Brittle Fracture at the Corner of P75 Rigid-Frame Pier in Kobe Harbor Highway During the Hyogoken-Nanbu Earthquake

Okashita, Katsuhiko; Ohminami, Ryoichi; Michiba, Kouji; Yamamoto, Akihisa; Tomimatsu, Minoru; Tanji, Yasuyuki; Miki, Chitoshi

doi:10.2208/jscej.1998.591_243

Cited by 31 publications

(13 citation statements)

References 4 publications

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“…The fracture driving force increased, owing to the dynamic loading effect, and the fracture toughness decreased, owing to the pre-strain effect.Unstable fractures of high-toughness steel structures in weld joints tend to occur after ductile crack initiation or propagation. During the great earthquake, as reported in [2,5,6], damage to steel structures occurred in weld joints after large strain deformation. The pre-strain in the cyclic loading, during the earthquake, occurred at the strain concentration area, like the weld toe in the weld structure.…”

mentioning

confidence: 95%

“…In multilayer welding, the texture and toughness of the HAZ due to multithermal cycles show very complex distributions. As a result of measuring the toughness change by the crack tip opening displacement (CTOD) test for the multilayer welded HAZ, the decrease in toughness in the HAZ was remarkable [2][3][4]. The HAZ is characterized by unequal growth of the…”

Section: Introductionmentioning

confidence: 99%

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Fracture Assessment of Weld Joints of High-Strength Steel in Pre-Strained Condition

Park

Ohata

et al. 2019

Applied Sciences

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Unstable fractures tend to occur after ductile crack initiation or propagation. In most collapsed steel structures, a maximum 15% pre-strain was recorded, at the steel structural connections, during the great earthquake of 1995, in Japan. Almost-unstable fractures were observed in the beam-to-column connections, where geometrical discontinuities existed. Structural collapse and unstable failure occurred after large-scale plastic deformations. Ship structures can also suffer from unstable fractures in the welded joints. The fracture resistance of butt-welded joints subjected to tension in the pre-strained condition was estimated by considering the toughness deterioration, due to pre-strain and toughness correction for constraint loss in a tension specimen. The target specimen for this fracture assessment was a double-edged, through-thickness crack panel, with a crack in the weld joint (heat-affected zone (HAZ)). The critical fracture toughness value (crack tip opening displacement (CTOD)) of a large structure with pre-strain, which was applied to the HAZ region, was estimated from a small-scale, pre-stained, three-point bend specimen. Fracture toughness values, evaluated by a CTOD test, were recently mandated for shipbuilding steel plates. The critical fracture toughness value is a very useful parameter to evaluate the safety of huge ship structures.

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mentioning

confidence: 95%

Section: Introductionmentioning

confidence: 99%

Fracture Assessment of Weld Joints of High-Strength Steel in Pre-Strained Condition

Park

Ohata

et al. 2019

Applied Sciences

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“…And fracture at the base end of steel piers is one of the failure modes 1) . This type of failure was also observed in the former researches 2), 3) .…”

Section: Introductionmentioning

confidence: 99%

Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

TATEISHI

Chen

Hanji

2008

Structural Eng./Earthquake Eng.

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This paper presents the results of un-stiffened cantilever column subjected to incremental or constant amplitude cyclic loading. The objectives of this study are to investigate the extremely low cycle fatigue life of the column and verify the proposed strain based approach. During the test, fatigue cracks initiated from the weld toe at the corner and propagated along the weld toe. Finally, the column ruptured without a local buckling. The failure of low cycle fatigue induced by large cyclic deformation has been elucidated. In a further step, the crack initiation life was estimated based on the local strain by proposed simple approach. It is indicated that correlation between the test result and the estimated life was good enough.

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“…Especially, large-scale straining at the stress/strain concentration region in structural components frequently lowers both the ductility and fracture toughness of structural steel, thereby facilitating the initiation of local ductile cracking and subsequent crack extension by cyclic loading, which can lead to brittle fracture [1,2]. An important measure for preventing brittle fracture of steel structure is critical design for preventing the initiation of ductile cracking under largescale cyclic loading.…”

Section: Introductionmentioning

confidence: 99%

Damage concept for evaluating ductile cracking of steel structure subjected to large-scale cyclic straining

Ohata¹,

Toyoda

2004

Science and Technology of Advanced Materials

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Evaluation of ductile crack initiation in steel welded structures subjected to seismic loading is crucial for structural design or safety assessment to prevent brittle fracture induced by ductile cracking. Observation of ductile crack initiation behavior of round-bar specimens with/without circumferential notches tested in single tension revealed that the main controlling factor for ductile cracking in the employed two-phase steel is not growth of voids induced by large inclusions, but nucleation of micro-voids in a soft phase (Ferrite phase) near the Ferrite -Pearlite interface after large-scale plastic straining. The material damage concept under reverse loading, which correlates the material damage for micro-void nucleation to macro-scale mechanical parameters, was proposed in consideration of two aspects of the Bauschinger effect: (a) a mechanical aspect which influences deformation and stress/strain behaviors in steel structures, (b) a material damage aspect caused by dislocation behavior. A new criterion for ductile cracking of structural members under cyclic loading was proposed on the basis of the proposed effective damage concept and 'two-parameter criterion,' which can be applied to the steel structures under increasing load in a single direction. The validity of the advanced two-parameter criterion was verified by subjecting round-bar specimens to cyclic loading tests along the axial direction and cross-shaped specimens to cyclic 3-point bending tests. Consequently, the advanced two-parameter ductile cracking criterion was found to be a transferable criterion for evaluation of critical loading cycle of structural members from small-scale tensile test results. q

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Investigation of the Brittle Fracture at the Corner of P75 Rigid-Frame Pier in Kobe Harbor Highway During the Hyogoken-Nanbu Earthquake

Cited by 31 publications

References 4 publications

Fracture Assessment of Weld Joints of High-Strength Steel in Pre-Strained Condition

Fracture Assessment of Weld Joints of High-Strength Steel in Pre-Strained Condition

Extremely Low Cycle Fatigue Assessment Method for Un-Stiffened Cantilever Steel Columns

Damage concept for evaluating ductile cracking of steel structure subjected to large-scale cyclic straining

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