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Duy Kien Dao,김인태,Haidang Phan 국제구조공학회 2021 Structural Engineering and Mechanics, An Int'l Jou Vol.79 No.1
The shear 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 of three large-scale composite beams with a newly puzzle shaped crestbond rib shear connector. The behavior of this shear connector was investigated and the results were correlated with those obtained from the push-out-test specimens. Four-point-bending load testing was carried out on steelconcrete composite beam models to consider the effects of the concrete strength, number of transverse rebars in the crestbond and the width of the concrete slab. The results of large scale experimental test include of: the deflection, ultimate load, strains of the concrete, steel beam and Perfobond connectors; the relative slip between the steel beam and the concrete slab at the end of the beams; and the relative failure mechanism. The results showed that the general behavior of a steel-concrete composite beam using Perfobond shear connectors was similar to that of a steel-concrete composite beam using conventional shear connectors such as head stud shear connector. The newly puzzle shaped crestbond shear connectors showed satisfactory performance and could be considered for application in composite structures.
F.E.M Analysis of Static Tensile Properties of Corroded Steel Structure at Connections
김인태,Duy Kien Dao 한국강구조학회 2022 International Journal of Steel Structures Vol.22 No.5
The second part of the two companion papers investigates the tensile properties of corroded steel structures numerically at connections. However, the design and calculation methodology of steel structures that are infl uenced by corrosion has not been proposed. This study simultaneously evaluated the tensile behavior of 4 types of artifi cially corroded steel members with concrete specimens in 100, 200, 400, and 600 cycles, and non-linear fi nite element methods (F.E.M) are also performed to assess the tensile behavior of corroded specimen over time. Based on the obtained results, fi nite element method model can be totally replaced experimental to analyze tensile properties of corroded steel structure at connections cause the error between F.E.M and the experiment is less than 3% in term of loading such as ultimate load, fracture load, yield load and at the same time F.E.M can ultimately fi nd out all the characteristics of the corrosion surface geometry such as displacement, cracks, destructive cross-sections, stress distribution. F.E.M can determine the failure cross-section of any corroded steel members. Accordingly, the infl uence eff ective thickness for the design and calculation of the corrosion-resistant steel structure overtime is also proposed based on the average depth of corrosion and standard deviation.
Fatigue Resistance Improvement of Welded Joints by Bristle Roll-Brush Grinding
김인태,김호섭,Duy Kien Dao,안진희,정영수 한국강구조학회 2018 International Journal of Steel Structures Vol.18 No.5
In the periodic repainting of steel bridges, often the steel surface has to be prepared by using power tools to remove surface contaminants, such as deteriorated paint fi lm and rust, and to increase the adhesive strengths of the paint fi lms to be applied newly. Surface preparation by bristle roll-brush grinding, which is a type of power tool, may additionally introduce compressive residual stress and increase the fatigue resistance of welded joints owing to the impact of rotating bristle tips. In this study, fatigue tests were conducted for longitudinally out-of-plane gusset fi llet welded joints and transversely butt-welded joints to evaluate the eff ect of bristle roll-brush grinding prior to repainting on the fatigue resistance of the welded joints. The test results showed that bristle roll-brush grinding introduced compressive residual stress and signifi cantly increased fatigue limits by over 50%.
Compressive strength evaluation of circular tubular short columns with locally corroded ends
Kim, Hyoung-Seok,Dao, Duy Kien,Shin, Chang-Hee,Jeong, Young-Soo,Kim, In-Tae Elsevier 2018 Journal of constructional steel research Vol.149 No.-
<P><B>Abstract</B></P> <P>When structural steel members are in contact with horizontal members, such as concrete slabs, dust and moisture easily accumulate at their junction. This can induce local corrosion at their ends, and consequently, reduce their compressive strengths. In this study, compressive tests were conducted on circular tubular short columns to examine the change in compressive strength with local corrosion at the ends of the columns. The columns were fabricated to have corrosion levels of various depths, heights, and circumferences. As a result, local buckling occurred near the column ends. Moreover, residual compressive strengths linearly decreased as the corroded depth, height, and circumference increased. An evaluation method using the effective volume was proposed to assess the residual critical compressive strengths of circular tubular short columns with locally corroded ends.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Change in compressive strength with local corrosion at the bottom end of column. </LI> <LI> Corrosion occurred at the contact of column and transverse member. </LI> <LI> Corrosion level of different depth, height, and circumference. </LI> <LI> Relationship between corrosion level and compressive strength. </LI> <LI> Evaluation equation of compressive strength using effective volume ratio. </LI> </UL> </P>
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.
Computational investigation of the comparative analysis of cylindrical barns subjected to earthquake
Yousef Zandi,Mahdi shariati,Aminaton Marto,Xing Wei,Zeki Karaca,Duy Kien Dao,Ali Toghroli,Mir Heydar Hashemi,Yadollah Sedghi,Karzan Wakil,Majid Khorami 국제구조공학회 2018 Steel and Composite Structures, An International J Vol.28 No.4
The structural behaviors of cylindrical barns as a specific engineering structure have been considered as a complicated computing process. The structure design against the earthquake load, to protect by using the code, is an urgency avoiding unexpected damages. The situation has been subjected to the applied design method if there would be no failure across the construction procedures. The purpose of the current study is to clarify the behaviors of cylindrical reinforced concrete barns through the analytic methods across the mass and Lagrangian approaches through the whole outcomes comparison indicating that the isoparametric element obtained from the Lagrangian approach has been successfully applied in the barns earthquake analysis when the slosh effects have been discarded. The form of stress distributions is equal with <i>s<sub>z</sub></i> closed distributions to one another.
부식실험에 의한 금속용사와 도장의 복합피복방식법의 내후성능평가
김인태,김호섭,킨쟈오두이,전제형,안진희,Kim, In Tae,Kim, Ho Seob,Kien, Dao Duy,Jun, Je Hyeong,Ahn, Jin Hee 한국강구조학회 2016 韓國鋼構造學會 論文集 Vol.28 No.2
금속용사 또는 도장은 강구조물의 방식에 널리 사용되고 있다. 금속용사와 도장의 복합피복방식법은 혹독한 부식환경하에 놓인 강구물의 새로운 일반적 피복방식법으로 선택되고 있다. 본 연구에서는 아연, 아연-15%알루미늄 합금, 알루미늄, 알루미늄-5%마그네슘 합금의 4종류 금속용사 후 실링 처리한 시편, 4종류 금속용사 후 중방식 도장한 시편과 도장한 시편에 대해 175일간의 NORSOK M-501 부식촉진실험, 250일간의 해수 Wet/dry 반복 부식실험, 3년간의 해양환경 옥외노출실험을 실시하였다. 그 결과, 외관관찰에 근거하여 각 방식법의 내후성능을 비교, 검토하였다. Thermally sprayed metals or organic coatings is often used in corrosion protection of steel structures. Duplex coating systems of thermally sprayed metal in combination with organic coating are selected as a new generic type of coatings on steel structures under the highly corrosive environments. In this study, three types of corrosion tests were carried out on four types of thermal sprayed specimens with sealing: zinc, zinc-15%aluminum alloy, aluminum and aluminum-5%magnesium alloy, four types of duplex coated specimens; thermally sprayed metals in combination with paint of acrylic urethane, and painted specimens. NORSOK M-501, Wet/dry cyclic seawater tests and outdoor exposure tests of nine types of specimens were conducted. From the corrosion test results, weathering performance of them were presented.