• 콘크리트학회논문집
• /
• 제12권6호
• /
• pp.13-22
• /
• 2000

In order to resolve the problem of increasing traffic entailed by the economic development, road system is reorganization and new highways are built, and long span bridges over 40m are being constructed in environmental and aesthetic considerations. Most long span bridges that are currently being constructed are in general steel box girder and preflex girder bridges; however these types of breiges are less efficiency than PSC I-type girder bridges in terms of construction cost and maintenance. Therefore, in these study, structural efficiency of PSC I-type girders based on section parameters, concrete compressive strength and other design parameter is observed to develope new PSC I-type girder for long span bridges. As a results of analysis, most important design parameters that control the stress of the girder are found to be the top flange width and the height of girder. In this light, the relationship between the two variables is determined and cross-section details of the girder that most appropriates for the long span bridges are proposed. The use of high strength concrete appears to increase the general design span however the increase rate of the span from increasing concrete ultimate strength appears to be reduced depending on the span. Also, the optimal girder spacing is determined through the parameter studies of design span using the proposed girder.

• 한국철도학회:학술대회논문집
• /
• 한국철도학회 2008년도 춘계학술대회 논문집
• /
• pp.262-267
• /
• 2008

The type used mainly in present our country in the superstructure of the railway bridge including the high speed railway is classified by the box girder and the I-type girder, greatly. The box girder is mainly used by the high speed railway bridge, and the I-type girder is used mostly by general railway bridge style. In this study, according to current railway bridge design code, we execute design by the span length of each considered bridge form. Also we analyze the suitable girder height by the span length and calculate the construction costs. The comparative analysis of the structural efficiency is produced by the span length. From this study, it is exposed that the girder height by the span length is the biggest in box girder. Also it is evaluated that the construction costs of the box girder is higher than that of the I-type girder although there is a difference between more or less according to adopted construction method.

• 콘크리트학회논문집
• /
• 제12권5호
• /
• pp.13-23
• /
• 2000

In this study, an flexural test on half-scale spliced PSC-I girder was conducted to verify the efficiency of the long span spliced girder as suggested by the Korean Highway Design Specification. The experimental results showed that the specimens developed a complex failure mode due to flexural-compression and torsional stress. The cracking moment of each girder was higher the experiment than was calulated by the ACI and the ultimate strength were the almost same. To estimate the safety and the structural efficiency of the spliced girder, the proposed Yielding Resistance Index(YRI) and ductility index by American Concrete Institutes were used based on the energy concept. The proposed YRI defined the ratio of crack resisting energy and the total energy calculated from load-displacement relationship. Based on the analysis of YRI and ductility index, the flexural behavior of the spliced girder was found to be efficient. Through the experimental results, the structural behavior of proposed spliced PSC I-type girder for long span bridge was found to be more efficient than the exsisting PSC I-type girders.

• 콘크리트학회논문집
• /
• 제12권6호
• /
• pp.43-50
• /
• 2000

In this paper, a new splicing method was applied to design the girder section of bridges with the span length of 25m, 30m, 35m, 40m and 45m. A U-type precast prestressed section was also determined for each bridge. Additionally, the sectional area, beam depth and Guyon's efficiency factor of the spliced U-type sections in each span were analyzed in comparison with the present I-type PSC bridges. As a result, in spite of an increase of 31%∼50% in the sectional areas compared with the I-type precast girders, the spliced U-type the beam depth of the spliced U-type girder was designed as 2,050 mm compared with the I-type precast girder of 2,600mm in a 40m span bridge. The sectional efficiency factors of the spliced U-type sections were analyzed as 0.76∼0.99. It shows that the spliced U-type sections ar of a superior structural efficiency in contrast to the average sectional efficiency factor of 0.66 value in the I-type girders.

• 한국콘텐츠학회논문지
• /
• 제14권7호
• /
• pp.511-517
• /
• 2014

일반철도 및 고속철도를 포함한 철도교량의 상부구조로 현재 우리나라에서 주로 사용되고 있는 교량형식은 크게 박스 거더교와 I형 거더교로 구분된다. 박스 거더교는 동적 거동에 대한 안전성이 우수하기 때문에 주로 고속철도 교량으로 많이 사용된다. I형 거더교는 일반철도 교량으로 주로 사용되며, 일반 PSC 거더교 형태와 철골철근콘크리트로 합성화된 구조인 프리플렉스 거더교의 형태로 크게 구분되고 또한 새로운 형식도 지속적으로 개발되고 있는 추세에 있다. 본 연구에서는 현행 철도교설계기준에 의거하여 각 형식별로 경간장에 따라 거더 설계를 실시하여 적절한 형고를 분석하여 경간장에 따른 구조적 및 경제적 효율성을 비교분석하였다. 비교분석을 수행한 결과, 구조적 효율성의 측면에서는 프리플렉스 거더교 형태의 교량이 경간장에 따른 형고가 가장 낮은 것으로 나타났으며, 경제적 효율성의 측면에서는 일반 PSC 거더교 형태의 교량이 가장 효과적인 것으로 평가되었다.

• 한국철도학회논문집
• /
• 제11권5호
• /
• pp.471-476
• /
• 2008

일반철도 및 고속철도를 포함한 철도교량의 상부구조로 현재 우리나라에서 주로 사용되고 있는 교량형식은 크게 박스 거더교와 I형 거더교로 구분된다. 박스 거더교는 동적 거동에 패한 안전성이 우수하기 때문에 주로 고속철도 교량으로 많이 사용된다. 1형 거더교는 일반철도 교량으로 주로 사용되며, 일반 PSC 거더교 형태와 철골 철근콘크리트로 합성화된 구조인 프리플렉스 거더교의 형태로 크게 구분되고 또한 새로운 형식도 지속적으로 개발 되고 있는 추세에 있다. 본 연구에서는 현행 철도교설계기준에 의거하여 각 형석별로 경간장에 따라 거더 설계를 실시하여 적절한 형고를 분석하며, 개략적인 교량가설 공사비를 산출하여 사용 경간장에 따른 구조적 효율성 및 경제성을 비교분석하였다. 이에 따른 비교분석을 수행한 결과, 구조적 효율성의 측면에서는 프리플렉스 거더교 형태의 교량이 경간장에 따른 형고는 가장 갖은 것으로 나타났으며, 가설 공사비의 측면에서는 일반 PSC 거더교 형태의 교량이 가장 경제적인 것으로 평가되었다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2003년도 봄 학술발표회 논문집
• /
• pp.187-192
• /
• 2003

Nowadays, It has adapted both Ultimate Strength Design(USD) and Allowable Stress Design(ASD) Method evaluating load-carrying capacity of PSC I Type Girder Bridge. But it has confused because the each method has brought some different results. This study shows some results of loading test of the PSC I type Girder Bridge and analyzed the structural behavior by FEM analysis considering material nonlinear. Parametric study of effective prestress of post tendon is performed and compared to results of loading test.

• 대한토목학회논문집
• /
• 제26권3A호
• /
• pp.421-428
• /
• 2006

본 연구는 일체형과 분절형 거더의 거동차이 최소화 및 PSI(Precast PSC-Segmental I Grider)거더의 역학적 거동 특성을 실험적으로 검증하기 위하여 실물 크기의 거더를 일체형(CG)실험체 1본, 분절형(SGT1, SGT2, SGT3)실험체 3본을 제작하여 실험을 수행하였다. 일체형(CG)실험체는 단 경간으로 25 m의 길이로 제작하였고, 분절형 실험체는 각 세그멘트를 5 m 길이로 제작하고 1차 긴장력을 도입하여 하나의 거더로 일체화 시킨 후, 슬래브를 타설한 다음 2차 긴장력을 도입하는 방법으로 제작하였다. 실험결과 모멘트는 실험값과 이론값의 오차가 매우 작거나 실험값이 이론값에 비해 약간 더 큰 것으로 나타나 PSI거더의 이론이 신뢰성이 있는 것으로 나타났다.

• 한국콘크리트학회:학술대회논문집
• /
• 한국콘크리트학회 2009년도 춘계 학술대회 제21권1호
• /
• pp.39-40
• /
• 2009

본 연구는 교량의 장경간화와 시공단축을 위하여 전구간이 동일한 단면을 가지며 중공이 있는 중공형 프리캐스트 프리스트레스 콘크리트 분절 거더를 개발하고 실용화하기 위한 정착장치를 개발하기 위함이다.

• 한국안전학회지
• /
• 제24권5호
• /
• pp.48-56
• /
• 2009

This paper presents the procedure for the optimal design of a PSC-I girder bridge considering life cycle cost (LCC). The load carrying capacity curves for the concrete deck, PSC-I girder and $\pi$-type pier were derived and used for the estimate of service lives. Total life cycle cost for the service life was calculated as sum of initial cost, damage cost, maintenance cost, repair and rehabilitation cost, user cost, and disposal cost. The advanced First Order Second Moment method was used to estimate the damage cost. The optimization method was applied to the design of PSC-I girder bridge. The objective function was set to the annual cost, which is defined by dividing the total life cycle cost by the service life, and constraints were formulated on the basis of Korean Standards. The optimal design was performed for various service lives and the effects of design factors were investigated.