International Journal of Highway Engineering (한국도로학회논문집)

Korean Society of Road Engineers (한국도로학회)
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Modeling of Friction Characteristic Between Concrete Pavement Slab and Subbase

콘크리트 포장 슬래브와 보조기층 간 마찰특성 모형화

  • Received : 2010.11.18
  • Accepted : 2010.12.03
  • Published : 2010.12.15
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Abstract

Volume of concrete slab changes by temperature and moisture effects. At that time, tensile stress develops because the slab volume change is restrained by friction resistance between the slab and subbase, and then crack occurs occasionally. Accordingly, researchers have made efforts to figure out the friction characteristics between the slab and subbase by performing push-off tests. Lately, researches to analyze concrete pavement behavior by the friction characteristics have been performed by finite element method. In this study, The friction characteristics between the slab and subbase were investigated based on the friction test results for lean concrete, aggregate, and asphalt subase widely used in Korean concrete pavements. The energy method bilinearizing relation between nonlinear friction resistance and displacement were suggested. The friction test was modeled by 3-D finite element program, ABAQUS, and the model was verified by comparing the analyzed results to the test results. The bilinear model developed by the energy method was validated by comparing analysis results obtained by using the nonlinear and bilinear friction resistance displacement relation as input data. A typical Korean concrete pavement was modeled by ABAQUS and EverFE and analyzed results were compared to evaluate applicability of the bilinear model.

콘크리트 슬래브는 온도 및 수분의 영향을 받아 체적이 변화된다. 이때 슬래브와 보조기층 간의 마찰저항이 슬래브 체적변화를 구속하여 인장응력이 발생되고 경우에 따라 균열이 유발되기도 한다. 따라서 연구자들은 Push-off 실험을 실시하여 슬래브와 보조기층간의 마찰특성을 파악하려고 노력해 왔다. 최근에는 마찰특성에 의한 콘크리트 포장의 거동을 유한요소법으로 해석하려는 연구가 수행되었다. 본 연구에서는 국내 콘크리트 포장에 주로 사용되는 린콘크리트, 쇄석, 아스팔트 보조기층에 대하여 실시된 마찰실험 결과를 바탕으로 슬래브와 보조기층 간 마찰특성을 조사하였다. 비선형의 마찰저항과 변위의 관계를 이중선형화하는 에너지 방법이 제시되었다. 마찰실험을 3차원 유한요소 프로그램 ABAQUS로 모형화하였으며 해석결과를 실험결과와 비교하여 모형을 검증하였다. 비선형과 이중선형 마찰저항-변위 관계를 각각 입력값으로 사용하여 얻은 해석결과를 비교하여 에너지 방법으로 개발된 이중선형 모형의 타당성을 검증하였다. 일반적인 국내 콘크리트 포장을 ABAQUS와 EverFE로 모형화하고 해석결과를 비교하여 이중선형 모형의 적용성을 평가하였다.

Keywords

References

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