• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
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• pp.457-462
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• 2003

It studies the non-structural crack factors that are produced in Steel Box Girder Bridge concrete floor plate using analytical method. It mainly studies humidity and design standard of concrete strength. It used MIDAS CIVIL Ver 5.4.0, a general structure analysis program that applies drying shrinkage rate of domestic road bridge design standard and standard value of creep coefficient, CEF-FIP standard equation and ACI standard equation from the aspect of creep, drying shrinkage and hydration heat to see the effect of the two factors on concrete crack and found the following result. The analytical results of this study showed that the initial stress, which was obtained by ACI standard, exceeds the allowable tensile stress between 5 to 18 days. This result means that even if a bridge is designed and constructed according to design standard, the bridge can have cracks due to various variables such as drying shrinkage, hydration heat and creep that produce stress in slab.

• Structural Engineering and Mechanics
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• 제60권4호
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• pp.595-614
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• 2016

By taking the Runyang Highway Bridge over the Yangtze River with 1490 m main span as example, structural response of the bridge under the horizontal and vertical seismic excitations is investigated by the response spectrum and time-history analysis of MIDAS/Civil software respectively, the seismic behavior and the influence of structural nonlinearity on the seismic response of the bridge are revealed. Considering the aspect of seismic performance, the suitability of employing the suspension bridge in super long-span bridges is investigated as compared to the cable-stayed bridge and cable-stayed-suspension hybrid bridge with the similar main span. Furthermore, the effects of structural parameters including the span arrangement, the cable sag to span ratio, the side to main span ratio, the girder height, the central buckle and the girder support system etc on the seismic performance of the bridge are investigated by the seismic response spectrum analysis, and the favorable earthquake-resistant structural system of suspension bridges is also discussed.

• EDISON SW 활용 경진대회 논문집
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• 제3회(2014년)
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• pp.637-642
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• 2014

선행 연구에서 블레이드 뒷전에 탄성 플랩이 장착되면 받음각에 따라 양력의 증가가 항력의 증가보다 상대적으로 더 커지게 되어 전체적인 양항비(앙력과 항력의 비)가 증가하는 것을 확인하였다. 본 논문에서는 선행의 연구를 참조하여 플랩의 길이가 변함에 따라서 양력과 항력의 변화를 비교하였다. 블레이드의 종류와 플랩의 제원은 현재 이용되는 수직축 풍력 발전기의 제품과 동일하게 사용하였다. EDISON_CFD와 MIDAS_IT를 이용하여 플랩이 장착된 블레이드 주변의 유체 유동을 해석하고, 플랩의 상하변위를 계산하였다. 이 과정을 반복 수행하여 플랩의 거동을 분석하고 플랩의 길이와 받음각에 따른 양항비를 비교하여 이전보다 효율적인 플랩을 설계하였다.

• 한국지반공학회:학술대회논문집
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• 한국지반공학회 2010년도 추계 학술발표회 2차
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• pp.122-130
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• 2010

In recent days, the foundations of huge structures in general and mega foundations of grand bridges in particular are required in geotechnical engineering. However, previous design method based on virtual fixed point theory cannot adequately predict Pile-Bent structure‘s physical behavior. Therefore, this paper describes a new analysis and design of Pile-Bent structure for grand bridges. A detailed analysis was performed for column-pile interactions using FB-Pier program and Midas program. As a result, the behavior of a column-pile is estimated and highlighted. Moreover, based on this study, it is found that the minimum reinforcement ratio(=0.4%) is applicable for plastic behavior of columns.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2002년도 가을 학술발표회 논문집
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• pp.381-387
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• 2002

Curved bridges are composed of curved members which have certain curvatures, comparing to straight bridges. Therefore, their behavior is quite different from one of the straight bridges, mainly due to the geometric characteristics of the curved bridges. In this paper, the curved bridges consisted of the single box-girder span are investigated to study the effects of negative reaction forces. The parameters considered in this study are span lengths, angles of curvature, and the number of shoes. Midas/civil computer program was used for the analysis of the curved bridges. The analysis results show that negative reaction forces are not created with one shoe installed. When two shoes are provided, on the other hands, the uplift forces are developed at the inside shoe. It is also concluded that the increasing ratio of negative reaction forces becomes larger, as the angles of curvature increase, and the elongation of span lengths turns out to increase the magnitudes of the uplift forces.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2011년도 정기 학술대회
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• pp.619-622
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• 2011

케이블 정착구 검토를 위해서 사장교 전 체계를 모델링하는 것은 전체모델링 해석시 많은 노력과 시간이 요구되고 해석결과의 분석 또한 어려움이 많다. 따라서 문제가 예상되는 부분만을 국부 상세해석하여 구조적 거동을 정확히 파악하는 것이 필요하다. 케이블 정착부에는 여러 보강재들로 구성되어 있어 국부해석에 어려움이 있다. 따라서 실제와 가능한 한 근접하도록 모델링을 하고 전체 구조물의 거동을 국부 상세모델에 적적히 반영할 수 있도록 경계조건을 설정하는 것이다. 본 논문에서는 부산 지하철 4호선의 아치형 사장교를 국내 범용 구조해석 프로그램인 MIDAS/CIVIL을 이용하여 아치리브와 거더정착구 모델링을 실시하였다. 해석 후 해석의 타당성을 검토하고 정착부의 안전성을 확보할 수 있는지 검토 분석 하고자 한다.

• 연구논문집
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• 통권28호
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• pp.239-246
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• 1998

Today’s information technology departments face a dilemma to create a competitive advantage for the organization by developing. deploying, and managing distributed applications that scale across the LAN, WAN, and Internet, while preserving investments in systems. Applications, information. IT organizations are today being asked to build the future, without breaking systems that maintain the current business. A possible answer to this dilemma is the implementation of a multi-tier distributed computing architecture. Multi-tier architecture has the potential to provide better, more timely information across the enterprise at a lower cost than the current combination of PC LAN, two-tier client/server, or mainframe applications that have been developed in most organizations. In this paper, we implement management information system based on distributed object middleware using multi-tier distributed computing architecture. This system uses Microsoft's implementation of DCOM/ActiveX and provides easily accessible web interface to the system users.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2007년도 정기 학술대회 논문집
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• pp.688-693
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• 2007

Nowadays various studies related with superstructure of bridges are developed and they pursuit more effective section of bridges superstructure, material and economical application of composite materials. CFT structure(Concrete Filled Steel Tubular Structure) is developed type of composite structure that concrete is filled with steel box, and the deformation of the member, stiffness and internal force will be improved by confinement effect of steel box and concrete. This paper introduces new type of girder, CFTA girder( Concrete- Filled and Tied Steel Tubular Arch Girder) which is combined with traditional CFT structure,arch effect and prestress through carrying out the structural analysis by computer programs. The computer programs which is used are ABAQCS and MIDAS, and the 12.2m girder which is applied same load and prestresses is analyzed and compared the results respectively.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2002년도 봄 학술발표회 논문집
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• pp.27-34
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• 2002

In the case of reinforced concrete structures, the knowledge of load transfer in the long-term behavior analysis considering construction sequence is very important. Even though long-term behavior of concrete structures has been widely studied, the studies on the time-dependent axial force variation of shore have been scarce to date. In order to investigate the shore behaviors under actual construction conditions, a three-story test frame was constructed on a construction site. The entire construction schedule for the test frame was made to follow the schedule of an actual three-story frame. To analyze the data collected from the test frame, an analysis method based on the Winkler foundation model was developed. This analysis method accurately Predicts the time-dependent behavior of shore. The analysis results coincide well with those obtained by the Midas GENw program

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 2010년도 정기 학술대회
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• pp.31-34
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• 2010

본 논문에서는 교량의 자유진동 모드의 중첩원리를 이용하여 KTX-교량의 동적상호작용 해석법을 제시한다. 이를 위하여 모드중첩법에 기초한 3차원 교량-차량의 에너지 식으로부터 에너지원리를 적용하여 교량과 차량의 상호작용을 고려할 수 있는 운동방정식을 유도한다. 이때 운동방정식의 해는 Newmark-${\beta}$ 방법을 사용한다. 그리고 궤도의 불규칙성은 FRA의 6등급 분류규정을 고려하여 각 등급별로 고속철도의 열차속도에 따르는 응답을 분석한다. 실제 고속철도에 사용되는 PSC 박스형 교량을 상용프로그램(MIDAS)를 이용하여 모델링하고 그로부터 각 모드별 형상을 얻어내어 본 논문에서 개발한 열차-교량 상호작용 프로그램에 입력하여 상호작용 해석을 수행한다.