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- 저자 : Van Phuoc Nhan Le (검색결과 5 건)
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Van Phuoc Nhan Le,Duc Vinh Bui,Thi Hai Vinh Chu,김인태,안진희,Duy Kien Dao 국제구조공학회 2016 Structural Engineering and Mechanics, An Int'l Jou Vol.60 No.6
The connector is the most important part of a composite beam and promotes a composite action between a steel beam and concrete slab. This paper presents the experiment results for three large-scale beams with a newly puzzle shape of crestbond. The behavior of this connector in a composite beam was investigated, and the results were correlated with those obtained from push-out-test specimens. Four-pointbending load testing was carried out on steel-concrete composite beam models to consider the effects of the concrete strength, number of transverse rebars in the crestbond, and width of the concrete slab. Then, the deflection, ultimate load, and strains of the concrete, steel beam, and crestbond; the relative slip between the steel beam and the concrete slab at the end of the beams; and the failure mechanism were observed. The results showed that the general behavior of a steel-concrete composite beam using the newly puzzle shape of crestbond shear connectors was similar to that of a steel-concrete composite beam using conventional shear connectors. These newly puzzle shape of crestbond shear connectors can be used as shear connectors, and should be considered for application in composite bridges, which have a large number of steel beams.
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Fatigue Behavior of Blast-treated Out-of-plane Gusset Fillet Welded Joints
김인태,Le Van Phuoc Nhan,이동욱 한국강구조학회 2008 International Journal of Steel Structures Vol.8 No.3
Blast cleaning prior to coating has been applied in newly built steel structures for cleaning forged surface and increasing adhesive property of applied coating systems. However, the effect of surface preparations by blast cleaning treatment on fatigue behavior of welded joints is not considered in Fatigue Design Codes. In this paper, fatigue tests were carried out on four types of out-of-plane gusset fillet welded joints, as-welded gusset specimens and three types of blast-treated gusset specimens, and then the effect of the blast cleaning treatment on the fatigue behavior of the welded joints was studied. The radius of curvature at weld toe of the blast-treated specimens was larger than that of as-welded specimens. The fatigue test results showed that the fatigue life of the blast-treated specimens is longer than that of as-welded specimens in low stress ranges, even though there is no significant difference in fatigue life between the two types in high stress ranges. Over 167% increase in fatigue limit could be realized by using blast cleaning treatment.
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강교 도장용 블라스트 처리가 면외거셋 용접이음의 피로거동에 미치는 영향
김인태,김광진,이동욱,Kim, In Tae,Le, Van Phuoc Nhan,Kim, Kwang Jin,Lee, Dong Uk 한국강구조학회 2008 韓國鋼構造學會 論文集 Vol.20 No.5
강구조물의 제작에는 흑피 등의 이물질 제거 및 도장의 부착성 증대를 위해 블라스트 표면처리가 실시되고 있지만, 이러한 도장용 블라스트 처리가 용접이음의 피로거동에 미치는 영향에 대해서는 검토되어 있지 않은 실정이다. 이에 본 논문에서는 강교 도장용 블라스트 처리가 용접이음부의 피로거동에 미치는 영향을 검토하기 위하여, 용접한 그대로 및 용접 후 블라스트 처리한 면외거셋 용접이음을 대상으로 피로실험을 실시하였다. 그 결과, 강교 도장용 블라스트 처리에 의해 면외거셋 용접이음의 용접지단부 비드접선각도 및 곡률반경이 증가되고 압축잔류 응력이 도입됨을 확인하였다. 그리고 면외거셋 용접이음의 피로수명은 고응력범위에서는 블라스트 처리의 유무와 상관없이 거의 동일하였지만, 저응력범위(150MPa이하)에서는 피로수명이 증가하였으며, 피로한계는 약 160%정도로 크게 증가함을 확인하였다. Blasting has been applied in newly-built steel structures for cleaning forged surfaces and increasing the adhesive property of applied painting systems. However, the effect of the blast cleaning on fatigue behavior of welded joints is not clear. In this paper, fatigue tests were carried out on out-of-plane gusset welded joints and the effect of the blast cleaning on the fatigue behavior was studied. The curvature radius at the weld toe of the surface-treated specimens by using the blast method is larger than that of as-welded specimens. By the blast cleaning compressive residual stresses were induced into weld toes. The experimental results showed that the fatigue life of surface-treated specimens is longer than that of as-welded specimens, even though the fatigue life of surface-treated specimens and that of as-welded specimens are not clearly different in the high stress range. About a 160% increase in fatigue limit could be realized by using blast cleaning.
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Thi Hai Vinh Chu,Duy Kien Dao,Duc Vinh Bui,Van Phuoc Nhan Le,김인태,안진희 국제구조공학회 2016 Steel and Composite Structures, An International J Vol.21 No.5
A newly puzzle shape of crestbond rib shear connector is a type of ductile perfobond rib shear connector. This shear connector has some advantages, including relatively easy rebar installation and cutting, as well as the higher shear resistance strength. Thus, this study proposed a newly puzzle shape of crestbond rib with a "Ʊ" shape, and its shear resistance behaviors and shear strengths were examined using push-out tests. Five main parameters were considered in the push-out specimens to evaluate the effects of shear resistance parameters such as the dimensions of the crestbond rib, transverse rebars in the crestbond dowel, concrete strength, rebar strength, and dowel action on the shear strength. The shear loading test results were used to compare the changes in the shear behaviors, failure modes, and shear strengths. It was found that the concrete strength and number of transverse rebars in the crestbond rib were significantly related to its shear resistance. After the initial bearing resistance behavior of the concrete dowel, a relative slip occurred in all the specimens. However, its rigid behavior to shear loading decreased the ductility of the shear connection. The cross-sectional area of the crestbond rib was also shown to have a minor effect on the shear resistance of the crestbond rib shear connector. The failure mechanism of the crestbond rib shear connector was complex, and included compression, shear, and tension. As a failure mode, a crack was initiated in the middle of the concrete slab in a vertical direction, and propagated with increasing shear load. Then, horizontal cracks occurred and propagated to the front and rear faces of the specimens. Based on the results of this study, a design shear strength equation was proposed and compared with previously suggested equations.
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