지방대학혁신역량 강화사업(NURI)과 연계한 철도시설 토목인력 양성 방안

정찬묵(Jung Chan-Mook),어성욱(Oa Sung-Wok) 한국철도학회 2004 한국철도학회 학술발표대회논문집 Vol.- No.-

Korea became the 5th country by opening the Kyungbu-Highspeed Railway in April of 2004, which has contributed to technical innovations and motivated to increase SOC investment for the Railroad facilities. This increase of Railroad facilities will need the many railroad civil engineers who are in charge of construction and maintenance. Moreover, we need more qualitative engineers to catch up with the speed of technical renovation and to play an important role in exporting our railroad technique to outside country such as China, and Russia. In this paper, a new alternative of training railroad civil engineers will be investigated in relation to NURI Project, which is sponsored by Ministy of Education.

복부좌굴을 고려한 플레이트거더의 휨강도를 예측하는 식의 유도

정찬묵(Chan Mook Jung) 한국강구조학회 1993 韓國鋼構造學會誌 Vol.5 No.4

The amount of increase of compression flange stress due to web buckling depends on four significant parameters : the ratio of compression flange area to web area, the square root of the maximum compressive stress to the buckling stress of the web, the relative magnitude of the initial deflection of the web, and the location of the neutral axis for an unsymmetrical plate girder cross section. To express the reduced bending strength in terms of these relevant parameters, a simple formula for the moment reduction factor is derived using a regression analysis. It is compared with other formulas in AISC, BS 5400, and SIA Specifications.

주요 국가의 강교량 LRFD 설계기준

정찬묵(Chan Mook Jung),황민오(Min Oh Hwang) 한국강구조학회 2002 韓國鋼構造學會誌 Vol.14 No.1

바닥판 콘크리트 타설순서에 따른 합성형교량의 거동해석

곽효경,서영재,정찬묵,박영하,Kwak, Hyo Gyoung,Seo, Young Jae,Jung, Chan Mook,Park, Young Ha 한국강구조학회 1998 韓國鋼構造學會 論文集 Vol.10 No.2

이 논문은 바닥판 콘크리트 타설 순서에 따른 합성형 교량의 거동을 예측하는 내용을 다루고 있다. 교량의 시간의존적 거동을 묘사하기 위하여 Dirichlet 급수를 사용한 크리프 함수를 사용하였고 단면해석은 적층단면을 사용하였다. 교량의 거동은 단면의 형태와 타설순서의 변화 효과를 고려하여 바닥판 콘크리트 타설에 따른 교축 방향의 모멘트 변화로써 나타내었으며 이 결과들을 이용하여 현장에서 널리 사용되고 있는 폐단면강 box 거더의 연속 바닥판 타설의 적합성을 보이고 있다. This paper deals with the prediction of behavior of composite girder bridges according to the placing sequences of concrete deck. Based on a degenerate kernel of compliance function in the form of Dirichlet series, the time-dependent behaviors of bridges are simulated, and the layer approach is adopted to determine the equilibrium condition in a section. The variation of bending moments along the bridge length caused by the slab casting sequence is reviewed and correlation studies between section types and placing sequences are conducted with the objective to establish the validity of the continuous placing of concrete deck on the closed steel box-girder which is broadly used in practice.

강합성 상자형 교량의 바닥판 타설에 따른 거동 연구(I) - 해석모델 및 현장실험 -

곽효경,서영재,정찬묵,박영하,Kwak, Hyo Gyoung,Seo, Young Jae,Jung, Chan Mook,Park, Young Ha 한국강구조학회 2000 韓國鋼構造學會 論文集 Vol.12 No.2

이 연구에서는 강박스 거더 교량의 연속 바닥판 타설에 따른 거동규명을 위해 시공중인 교량에 대한 현장실험과 해석을 수행하였다. 해석 및 실험 결과는 교축을 따라 교량의 거동이 크게 변하는 몇몇 점들에서 단명의 상, 하부 플랜지의 변형률로 나타내었으며 이를 통해 제안된 해석모델의 적합성을 검토하였다. 해석적 연구를 위해 사용한 모델은 단면해석의 경우 적층단면을 사용하였으며 요소 강성은 변위법과 3점 가우스 수치적분을 사용하여 구성하였다. 끝으로 해석결과와 실험결과를 비교, 검토하였다. In this study, both experimental and analytical study for behavior of the existing composite steel box girder bridges, constructed along with the procedure of continuous placing slab, are conducted to establish the validity of the proposed model. The layer approach is adopted to determine the equilibrium condition in a section to consider the different material properties and concrete cracking across the sectional depth, and the beam element stiffness is constructed on the basis of the assumed displacement field formulation and the 3-points Gaussian Integration. In addition, the effects of creep and shrinkage of concrete for time-dependent behavior of the bridge are taken into consideration. Finally, both analytical and experimental results are compared.

강합성 상자형 교량의 바닥판 타설에 따른 거동 연구(II) - 해석적 연구 및 균열제어 -

곽효경,서영재,정찬묵,박영하,Kwak, Hyo Gyoung,Seo, Young Jae,Jung, Chan Mook,Park, Young Ha 한국강구조학회 2000 韓國鋼構造學會 論文集 Vol.12 No.2

이 연구는 콘크리트 바닥판의 타설방법과 단면형태에 따른 강박스 거더 교량의 거동에 관한 것이다. 단계 타설의 경우 각 타설부분의 시간차이는 바닥판 콘크리트의 응결시간의 차이를 일으키고 이로 인하여 발생되는 교량의 시간에 따른 거동이 이 연구에서 해석되었다. 또한 거더 단면과 바닥판 콘크리트의 타설순서의 상관관계의 관한 연구를 위하여 콘크리트 크리프와 건조수축의 효과가 이 연구에서 제안된 해석모델에 포함되었다. 끝으로 바닥판 콘크리트의 초기 횡방향 균열을 방지하기 위하여 현장에서 관리할 수 있는 콘크리트 슬럼프와 상대습도가 제안되었다. This study deals with behavior of steel box girder bridges according to the concrete slab casting sequences and sectional types. The time dependent behavior of bridges caused by the differential setting of slab concrete resulting from time gap for each part of slab deck in a sequential placing method produces is analyzed. In correlation studies between girder section types and placing sequences, time dependent effects of concrete creep and shrinkage are implemented in the analytical model proposed in the previous study. Finally, field recommendations in terms of concrete slump and relative humidity are suggested to prevent early transverse cracking of concrete slabs.

Anisotropic Behavior of Decomposed Granite Soils

안태봉(Ahn Tae-Bong),정찬묵(Jung Chan-Mook),진한규(Jin Han-Gyu),노재호(Roh Jae-Ho) 한국철도학회 2005 한국철도학회 학술발표대회논문집 Vol.- No.-

화강풍화토의 강도와 변형특성을 조사하기 위하여 불포화배수 삼축압축시험을 실시하였다. 이차압축시의 변형거동에 관한 시간의존성은 다짐각도와 관계가 없는 것으로 판단되었다. 다짐각도가 압축강도와 변형에 미치는 영향은 특히 낮은 구속압력시에 크다. 다짐각도가 다르다 하더라도 다일러턴시 비율은 다일러턴시로 인한 강도증가와 상관하여 변화한다. 따라서 다짐풍화토는 초기 비등방성 조직을 갖고 있는 모래와 같이 비등방성 역학적 성질을 갖는다고 할 수 있다.

장대레일 재설정 방법 개선 연구

김우진(Woo-Jin Kim),정찬묵(Chan-Mook Jung),민경주(Kyung-Ju Min) 한국철도학회 2007 한국철도학회 학술발표대회논문집 Vol.- No.-

Due to the transportability problems, long rail shall befrom base rail unit, which is normally 100m for regular rail and 300m for high speed rail. After these rail units aretransported from the fabricator to the site, the field weld would be performed.axial stresses in the long rail is mainly from the temperature differences at various locationsthe long rail. Also thegaps between each welds cause secondary axial stresses in therail.In addition to these, re-weldsthe fractured rails, rail buckling, irregular rail vibration, rail twist also result innonuniform axial stresses in therail. To obtain the rail buckling stability, therail stresses shall be released due to the resetting of CWR. Traditionally two resetting of CWR methods have been applied, the one is rail heater and the other is rail tenser. these methods, the latter has been recommended because it has less limitation in the rail length and it is easier to minimized the force differences. But even in this method, the calculation is cumbersome andis not easy to find out the rail stress distribution itself.refined methodsxial stress resetting in the long rail is studied and this study be easily applied in the real construction. From this approach, more rational rail maintenance system can be expected.

철도부문 민자사업 활성화를 위한 철도시설공단 역할 재정립 및 업무개선방안에 관한 연구

김계웅(Gye-Woong Kim),정찬묵(Chan-mook Jung),정대호(Dae Ho Jung) 한국철도학회 2015 한국철도학회 학술발표대회논문집 Vol.2015 No.10

정부는 교통, 물류의 활성화와 국민의 편익을 증진하기 위해 2001년 인천공항철도를 최초로 민자사업으로 추진한 이래 철도인프라의 조기공급을 위해 많은 노력을 기울이고 있다. 현재 국내의 민자사업 중 철도부문은 총 사업비 기준 7%를 차지하고 있으며, 최근 복지부문 등의 재정지출 증대와 지속적인 경제침체로 인한 정부재정부족 문제로 대규모 자본이 필요한 철도사업에 대한 민간투자의 필요성이 더욱 증대되고 있다. 그러나 현재 제시되어 있는 민자사업관리 방안은 철도사업 고유의 특성을 충족시키기에 부족하며 민간의 창의와 효율을 발휘할 수 있는 요소가 제대로 반영되어 있지 않다. 따라서 본 논문에서는 철도 민자사업 활성화를 위해 철도부문 민자사업을 추진함에 있어 철도시설공단 역할의 재정립을 통한 업무지원 및 사업관리 업무개선방안을 제시하고자 한다. Since Incheon International Airport Railway is the first public-private partnerships project of railway field in 2001, the government is trying for infrastructure expansion of railway facility for activation of people convenience and transport logistics. The railway projects business is required a lot of capital, but recent the government financial condition is in the face of serious difficulties owing to welfare expenditure growth and economic downturn. Thus the need for private investment in railway projects in need of largescale capital has been further increased. But private business management plan that are currently proposed are insufficient elements to meet the unique characteristics of the railway business. And it makes difficult that exert creativity and efficiency of the private. In this paper proposes measures in promoting a private business support and project management improvements through KRNA’s role reestablishment.

확공을 이용한 지압형 앵커의 인발거동 특성 연구 (The Study of Pullout-Behavior Characteristics of The Ground Anchor Using Expanded Hole)

민경남(Kyong-Nam Min),정찬묵(Chan-Mook Jung),정대호(Dae-Ho Jung) 한국철도학회 2011 한국철도학회 학술발표대회논문집 Vol.2011 No.5

Ground anchor expands the hollow wall of settled part and has the structure which resists the designed tensile load by the bearing pressure generated by the wedge of the anchor body pressing in the expanded part. Such ground anchor has been recognized for stability and economicality since 1960s in technologically advanced nations such as Japan and Europe, and in 1970s, the Japan Society of Soil Engineering has established and announced the anchor concept map. The ground anchor introduced in Korea, however, has the structural problem where the tensile strength is comes only from the ground frictional force due to expansion of the wedge body. In an interval where the ground strength is locally reduced due to fault, discontinuation or such, this is pointed out as a critical weakness where the anchor body of around 1.0m must resist the tensile load. Also, in the installation of concrete block, the concentrated stress of concrete block constructed on the uneven rock surface causes damage, and many such issues in the anchor head have been reported. Thus, in this study, by using the expanded bit for precise expansion of settled part, the ground anchor system was completed so that the bearing pressure of ground anchor can be expressed as much as possible, and the bearing plate was inserted into the ground to resolve the existing issues of concrete block. Through numerical analysis and pullout test executed for verification of site applicability, the pullout-behavior characteristics of anchor was analyzed.