• Proceedings of the Korea Concrete Institute Conference
• /
• 2009.05a
• /
• pp.451-452
• /
• 2009

The purpose of this study was to investigate the seismic performance of precast segmental PSC bridge piers with precast footings. A model of precast segmental PSC bridge piers with precast footings was tested under a constant axial load and a cyclically reversed horizontal load.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2008.04a
• /
• pp.33-36
• /
• 2008

The present, most of bridges have been constructed with RC piers in Korea. But the construction of bridges with RC piers is limited to certain working environment and weather that give rise to some series trouble such as weak constructability, quality deterioration and rising of the cost of construction. For this reason, the construction tend to focus on the developing of more effective and economical construction methods. Of all methods, prefabricated precast segment piers have been examined more extensively, it has become a solution of some problems like traffic congestion that usual site placing methods have. The Korea government has the already issued specification earthquake effect. But the existing seismic specification are inapplicable to bridges with prefabricated precast segment piers. This study analyzes structural behabviors of the RC model, prestressted pier moel, the prefabricated precast segment pier with no shearduct model and the prefabricated segment piers with shearduct and changed post tensioning force.

• Proceedings of the Korea Concrete Institute Conference
• /
• 2010.05a
• /
• pp.447-448
• /
• 2010

This study was conducted to investigate the feasibility of precast concrete slab fabrication. Slabs were designed including detailed element techniques, and based on the design, high performance precast slabs could be fabricated.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.29 no.4A
• /
• pp.407-419
• /
• 2009

The purpose of this study is to investigate the seismic behavior of precast segmental PSC bridge columns with precast concrete footings and to provide the details and reference data. Six precast segmental PSC bridge columns were tested under a constant axial load and a cyclically reversed horizontal load. A computer program, RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), for the analysis of reinforced concrete structures was used. A bonded or unbonded tendon element based on the finite element method, that can represent the interaction between tendon and concrete of prestressed concrete member, is used. A joint element is modified to predict the inelastic behaviors of segmental joints. This study documents the testing of precast segmental PSC bridge columns with precast concrete footings and presents conclusions based on the experimental and analytical findings.

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.30 no.5A
• /
• pp.475-484
• /
• 2010

The purpose of this study is to investigate the inelastic behavior of precast concrete copings for precast segmental PSC bridge columns and to provide the details and reference data. Twelve one-fourth-scale precast concrete copings were tested under quasistatic monotonic loading. In this study, the computer program, named RCAHEST (Reinforced Concrete Analysis in Higher Evaluation System Technology), was used. A joint element is modified to predict the inelastic behaviors of segmental joints. This study documents the testing of precast concrete copings for precast segmental PSC bridge columns and presents conclusions based on the experimental and analytical findings.

• Magazine of the Korea Concrete Institute
• /
• v.12 no.1
• /
• pp.60-68
• /
• 2000

• KSCE Journal of Civil and Environmental Engineering Research
• /
• v.34 no.5
• /
• pp.1363-1372
• /
• 2014

In the previous study, the structural performance of proposed precast concrete arch with reinforced joint was evaluated by structural experiment. In this paper, finite element analysis considering both material and contact nonlinearity was carried out on the specimens of the previous study. Based on the result of analysis and experiment, friction coefficient between concrete blocks was determined. To evaluate the strength of sectional member, elastic analysis was carried out on the arch using linear elastic analysis program. The section force was compared with the nominal strength of arch section. It was concluded that the maximum load of all the specimens exceed the nominal strength of arch section. Those results of the strength evaluation were similar to the results of structural experiments. Therefore, it is concluded that the elastic analysis and ultimate strength model can effectively evaluate the strength for the proposed precast concrete arch composed of concrete blocks and reinforced joint in design.

• 한국정보통신설비학회:학술대회논문집
• /
• 2007.08a
• /
• pp.315-319
• /
• 2007

지하에 설 치된 맨홀의 구조물이 노후되거나, 내부에 수 용된 시설물로 작업 공간이 협소하여 맨홀 구조물을 대개체 할 펼요가 있을 경우, 지금까지는 대부분 현장 콘크리트 타설에 의한 방법을 사용하였다. 이러한 방법은 거푸집 시공, 콘크리트 타설, 콘크리트 양생, 거푸집 철거 등의 공정이 소요되어 공사 기간이 장기화 되고, 도심지에 위치한 맨홀인 경우에는 차량과 보행자의 통행 불편을 초래하기도 하였다. 또한, 통상적으로 사용되고 있는 프리캐스트 맨홀에 비해 시공 품질이 낮아 향후 맨홀의 운용 및 유지관리에 많은 어려움을 겪는 원인이 되기도 하였다. 본 논문에서는 이러한 문제점들을 해결하기 위해, 폴리머 콘크리트를 이용하여 하부, 벽체, 상부로 구성된 다수의 세그먼트를 생산한 후, 현장에서 이들 세그먼트를 조립하여 맨홀을 설치하는 방법을 연구하였다. 가변형 거푸집을 이용한 세그먼트 제작과 조립식 블록에 의한 관구를 사용하여 현장 적용성을 높임은 물론, 프리캐스트로 생산되는 폴리머 콘크리트 맨홀 수준의 시공 품질을 확보할 수 있도록 하였다.

• Magazine of the Korea Concrete Institute
• /
• v.24 no.2
• /
• pp.32-36
• /
• 2012

• Magazine of the Korea Concrete Institute
• /
• v.23 no.3
• /
• pp.53-55
• /
• 2011