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RISS 인기검색어
- 검색키워드
- 저자 : Cut Atika Putri (검색결과 2 건)
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Failure Probability for Fatigue Crack in Web Plate of Bridge Girder
Cut Atika Putri,Kazuo Tateishi,Masaru Shimizu,Takeshi Hanji 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.1
Out-of-plane gusset joints are commonly used in welded assembly structures such as bridges. The studies regarding outof- plane gusset joint often defi ne fatigue life of this joint as the condition when the crack has fully penetrated through the web plate. However, the time frame from crack initiation until reaching complete structural failure is unclear. In this study, extended fatigue crack propagation analysis of out-of-plane gusset joint is performed. The variation of infl uential parameters such as fl ank angle, weld toe radius, material constant, and the threshold value of stress intensity factor range was considered. The crack propagation analysis was done until the crack reaches 80% of the lower fl ange plate of the bridge girder. Since the crack propagation life is highly infl uenced by traffi c conditions, the probability distribution of the number of cycles and the crack width (2 b ) is presented in regards to the fatigue life ratio. In estimating the failure probability of the joint, the infl uence of human error to detect cracks during the inspection is considered. Five cases of the probability of crack detection are assumed to represent the capability of the inspector. It was found that bridge inspection and reparation of cracks are important in controlling the failure probability.
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Evaluation of Thickness Effect on Fatigue Life Variation of Longitudinal Welded Gusset Joint
Cut Atika Putri,Tateishi Kazuo,Masaru Shimizu,Takeshi Hanji 한국강구조학회 2024 International Journal of Steel Structures Vol.24 No.2
Numerous studies have been conducted regarding the fatigue strength of longitudinal welded gusset joints. Most studies employed relatively small specimens. Thus, this study aims to evaluate the variation of fatigue life of longitudinal welded gusset joints by using the probabilistic fracture mechanics approach, particularly for larger specimens. Although some studies claimed that lower fatigue strength is found in the thicker main plate specimens, however only a limited number of fatigue test was conducted. A probabilistic approach was employed to conquer the shortfall. In this study, fatigue crack propagation analysis was performed on the main plate thicknesses of 12, 40, and 60 mm to evaluate the eff ect of main plate thickness on the fatigue life of the joints. Then, a probabilistic approach is given to investigate the variation of fatigue life of the joint. In addition, fatigue tests were carried out to investigate the crack propagation behavior on larger specimens. A signifi cant decrease in fatigue life was observed by the increase of the main plate thickness from 12 to 40 mm, however, no further decrease thereafter. The fatigue strength of longitudinal welded gusset joints with the main plate thickness of 12 mm was appertained to category F in the JSSC design curve. Meanwhile, the fatigue strength of longitudinal welded gusset joints with the main plate thickness of 40 and 60 mm falls into category G in JSSC. This condition was also confi rmed by the fatigue test results, where both specimens were classifi ed as category G in JSSC.
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