Experimental Analysis of Prestressed Approach Slab Behavior

프리스트레스가 도입된 접속슬래브의 실험적 거동 분석

  • 박희범 (경희대학교 대학원 토목공학과) ;
  • 엄인섭 (경희대학교 대학원 토목공학과) ;
  • 김성민 (경희대학교 대학원 토목공학과)
  • Received : 2010.11.14
  • Accepted : 2010.11.24
  • Published : 2010.12.15


This research was conducted to analyze the behavior of Single-PTAS (Single Post-Tensioned Approach Slab) under tensioning and environmental loads by performing field tests when the demonstration Single-PTAS was being constructed. The temperature measurement sensors were installed at different depths, and the displacements in the approach slab under environmental loads and tensioning were measured using displacement transducers. As an experimental result, an abrupt change in the longitudinal displacement due to tensioning was not observed. The daily temperature change in the approach slab was negligible where the depth is over about 35cm. The temperature gradient in the approach slab adjacent to bridge was smaller than that adjacent to pavement. The patterns and magnitudes of vertical displacements were directly related to the temperature gradient at the measuring location. The behavior of Single-PTAS was very similar to that of concrete pavement. Therefore, a new design methodology for approach slabs is needed to include the pavement concept and to overcome drawback of current design procedures based on the simple beam concept.


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