프리스트레스트 콘크리트 포장의 횡방향 긴장 설계방안 = Design Methodology of Transverse Post-Tensioning for Prestressed Concrete Pavements

국문 초록 (Abstract)

본 연구는 프리스트레스트 콘크리트 포장(PSCP)의 횡방향 긴장 설계방안을 구축하기 위하여 수행되었다. 우선 PSCP에 횡방향 긴장을 가했을 경우에 긴장간격에 따른 슬래브의 응력분포를 분석하였다. 또한 환경하중과 차륜하중이 PSCP슬래브에 작용할 때 슬래브에 발생하는 인장응력의 분포도 분석하였다. 이러한 환경 및 차륜하중 등의 설계하중과 긴장응력을 결정하는 기준인 슬래브의 허용인장응력을 합리적으로 선정하는 방법에 대하여 논의하였으며 이러한 기준의 선정이 횡방향 긴장 설계에 미치는 영향을 분석하였다. 연구결과, 긴장간격이 커질수록 긴장응력의 손실을 가져오는 범위가 넓어지며 특히 Shoulder부분에서의 응력손실이 급격하게 증가하는 것을 알 수 있었다. 따라서 횡방향 긴장 설계는 설계하중에 대한 슬래브의 응력을 산출한 후 슬래브가 허용인장응력 이내의 응력을 받도록 평균긴장응력을 산출하여 긴장간격 및 긴장량을 결정하면 되지만, 이때 Shoulder, Wheel Pass, 중앙부 등 슬래브의 여러 다른 위치에서의 응력 또한 반드시 검토하여 적절한 긴장간격을 선정하여야 한다.

다국어 초록 (Multilingual Abstract)

This study was conducted to develop the design methodology of transverse post-tensioning for the prestressed concrete pavement (PSCP). The transverse stress distribution was analyzed when the transverse anchor spacing changed. The tensile stress distribution in the PSCP slab due to the environmental and vehicle loads was also investigated. The reasonable methods were discussed to determine the design loads including environmental and vehicle loads and the PSCP allowable tensile stress used for the basis of the selection of the stress application amount from the tensioning. The results of this study showed that as the transverse anchor spacing increased, the range of the stress loss became larger and the stress loss was significant near the shoulder. The design of the transverse post-tensioning can be performed by obtaining the stresses under the design loads and by considering the allowable tensile stress; however, the tensile stresses at different locations such as the shoulder, wheel pass, and slab interior should also be checked and kept below the allowable tensile stress.

참고문헌 (Reference)

1 Brunner, R. J., "“Prestressed Pavement Demonstration Project,”Transportation Research Record, No. 535, Transportation Research Board"

2 ABAQUS, "User’s Manual Version 6.7, Hibbit, Karlsson & Sorensen, Inc., Pawtucket, R. I"

3 Klunker, F., "Status and Developments in the Construction of Prestressed Concrete Runways in European Airport" Purdue University 1981

4 Friberg, B. F., "Prestressed Concrete Highway Pavement at Dulles International Airport" Highway Research Board (466) : 1-19, 1973

5 Powers, R., "Nine Year Performance Evaluation of Arizona’s Prestressed Concrete Pavement" Transportation Research Board (1136) : 1987

6 AASHTO, "Guide for Design of Pavement Structures, American Association of State Highway and Transportation Officials"

7 Mendoza-Diaz, A., "Design of the Texas Prestressed Concrete Pavement Overlays in Cooke and McLennan Counties and Construction of the McLennan County Project" The University of Texas at Austin 1986

8 Medina-Chavez, C. I., "Design Standards, Special Specifications, and Monitoring Plan for PCP in Texas" The University of Texas at Austin 1-50, 2005