• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 봄 학술발표회 논문집
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• pp.13-19
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• 2002

우리나라의 고속도로는 1968년 2월 1일 경부고속도로를 착공한 이래 꾸준히 증가하였으며 2002년 현재 2,637km가 건설되었다. 이는 전체 도로 연장(91,396km)의 약 2.9%에 해당한다(표 1 참조). 고속도로는 그림 1에 나타낸 바와 같이 1990년 이후 급격히 증가하였으며, 앞으로도 계속 증가하여 2004년까지 약 3400km, 2020년까지 남북방향으로 7개축(3,291km), 동서방향으로 9개축(2,869km)의 7$\times$9 간선도로망을 목표로 총 6,000km 이상이 건설될 예정이다.(중략)

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2000년도 가을 학술발표회 논문집(II)
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• pp.1001-1006
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• 2000

These should be constructed partially, because many prestressed concrete box girder bridges in situ have large cross section and long span. Therefore, accurate prediction of differences, both elapse time of each construction stage and exposure of atmosphere at each position of cross section, is very important. Though it is importance, engineers are apt to overlook it. This study predicted cracks due to shrinkage and stress concentration phenomenon by each construction stage and then, ascertained reduction of tensile stresses after applying retrofit scheme.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 1991년도 가을 학술발표회 논문집
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• pp.74-79
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• 1991

In order to investigate the behavior of newly developed PC deck plate bridges, 1/2 scale model specimen was tested under the 2 million cycles of fatigue loading. Forces between PC members were transfered by shear keys located at the faces of deck plate and girders. The test results showed that the test specimen maintained its original strength after 2 million cycles of fatigue loading.

• 한국산학기술학회논문지
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• 제13권8호
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• pp.3704-3712
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• 2012

최근, 장대교량의 해상기초 구조물에 수중불분리성 콘크리트의 사용이 증가되고 있다. 그러나, 해상기초 구조물에 사용되는 수중불분리성 콘크리트의 공사기간을 단축시키기 위해서는 이전의 수중불분리성 콘크리트보다 유동성을 크게 개선시키는 고유동 수중불분리성 콘크리트의 제조가 필요하다. 따라서 본 연구의 목적은 해상기초 구조물에 사용되는 고유동 수중불분리성 콘크리트의 최적배합비를 도출하는 것이다. 이를 위하여 단위결합재량 550, 600kg/$m^3$ 각각에 대해서 수중불분리성 혼화제 첨가량별로 고로슬래그 미분말을 혼입한 콘크리트를 제작하였다. 제작된 콘크리트의 슬럼프 플로, 응결시간, 수중분리저항성 및 압축강도 비와 같은 품질성능을 관련 규격에 따라 평가하였다. 결국, 고로슬래그 미분말을 혼입한 고유동 수중불분리성 콘크리트는 관련 규격을 만족시키는 수중불분리성 혼화제의 최소 첨가량이 필요한 것으로 나타났다.

• 한국지진공학회:학술대회논문집
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• 한국지진공학회 2000년도 춘계 학술발표회 논문집 Proceedings of EESK Conference-Spring
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• pp.383-390
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• 2000

The purpose of this paper is to investigate dynamic characteristics of an isolated bridge with a different location of seismic isolation at piers and to determine the best location of seismic isolation. The substructure of the bridge is two column framed type reinforced concrete and has relatively high piers so it has long natural period, To decide the best location of seismic isolations displacement shear force bending moment acceleration and absorbed energy are compared using fast nonlinear analysis. To isolate overall structures is effective to bending moments and shear forces for long period bridges.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2002년도 가을 학술발표회 논문집
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• pp.717-723
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• 2002

Recently, the interest in safety assessment of civil infrastructures is increasing in Korea. Especially, as bridge structures become large-scale, it is necessary to monitor and maintain the safety state of bridges, which requires the monitoring system that can make a long-term measurement during the service time of bridge. In this paper, advanced fiber optic sensors for long-term measurement, setup techniques of bridge monitoring system and the assessment of measured data are introduced. Attached or embedded optical fiber sensors to structural members of small and big structures including Sung San Bridge are surveyed. For the Sung San Bridge, the responses of the fiber optic sensors by 30 ton weigh truck loads with various speeds ate measured. Monitoring system is also applied to the mock-up of bridges. The monitoring capability of the advanced fiber optic sensor system was confirmed.

• 한국전산구조공학회:학술대회논문집
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• 한국전산구조공학회 1994년도 봄 학술발표회 논문집
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• pp.163-170
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• 1994

The widening of bridges under traffic condition brings to many problems. One of these is the internal stresses caused by different creep and shrinkage behavior of the existing bridge and that of the widened Bridge. This study was conducted to examine the effects of different creep and shrinkage behaviors between concretes. The results are as follows; Comparing the computational analysis results with the experimental study, it is shown that finite element analysis used in this study was well accorded with experimental results. And considering the shrinkage effects in widened bridges, joining-construction using the expanding concrete between the existing and widened bridge after at least three months from the day of completion of new bridge, is recommended.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 봄 학술발표회 논문집
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• pp.455-460
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• 2001

Generally, the contribution of curbs and median strip is not considered carefully in analysing and designing the girder bridges. There being curbs, the load given on interior girder relatively reduced and on exterior girder increased. Curbs and median strip reduce the load distribution factor by distributing the load given on girder fairly, In this paper, the Influence of curbs and median strip in wheel distribution through parameter study and lateral distribution test of PSC girder bridge was investigated. Finite-element analysis was performed with parameterizing the flexural rigidity of the girder, span length, girder spacing, median strip, curbs. The influence of curbs and median strip would increase with lowering rigidity of girder. In addition, curbs lower the load distribution factor of exterior and interior girders.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.859-864
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• 2001

An effective live load model for analyzing probable maximum live load effects such as moment and shear in transverse direction was developed. The main procedure of this live load model is composed of four parts, i.e., firstly, determination of the appropriate influence lines in longitudinal direction, secondly, application of the characteristics of vehicles and traffic patterns in longitudinal direction, thirdly, determination of the appropriate influence lines in transverse direction, and fourthly, application of the characteristics of vehicles and traffic patterns in transverse direction. Through this procedure, the probabilistic distributions of maximum probable load effects are deduced in the form of probability density function (PDF) and/or cumulative density function(CDF). This live load model is able to consider local or global deterioration of bridges in the structural analysis.

• 한국콘크리트학회:학술대회논문집
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• 한국콘크리트학회 2001년도 가을 학술발표회 논문집
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• pp.865-870
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• 2001

An effective live load model for analyzing probable maximum live load effects in longitudinal direction such as moment and shear was developed. The main procedure of this live load model is composed of two parts. Firstly, determination of the appropriate influence lines, and secondly, application of the characteristics of vehicles and traffic patterns. Through this procedure, probabilistic distributions of maximum probable load effects are deduced in the form of probability density function (PDF) or cumulative density function (CDF). The proposed live load model is not limited by bridge types(number of spans or girders) and can consider local or global deterioration of bridges in the analysis. Besides, load effects can be determined at any section without restrictions.