3차원 유한요소 모형을 이용한 줄눈 콘크리트포장 하중전달의 민감도 분석 = Sensitivity Analysis of Load Transfer of Jointed Concrete Pavements Using 3-D Finite Element Model

국문 초록 (Abstract)

하중전달효율은 다웰이 설치되었거나 설치되지 않은 콘크리트포장 줄눈의 구조적 성능을 나타내기 위하여 사용된다.
ABAQUS 소프트웨어를 사용한 줄눈 콘크리트포장의 3차원 모형이 본 연구를 통하여 구축되었다. 기층과 노상이 접착되
어 구성된 하부층 위에 3개의 슬래브가 놓였으며, 스프링 요소를 사용하여 인접한 슬래브를 줄눈에서 연결하였다.
콘크리트포장의 다양한 줄눈강성을 모사하기 위하여 다양한 값의 스프링 상수를 입력값으로 사용하여 그 관계를 조사하
였으며, 스프링 상수가 커질수록 줄눈의 하중전달효율이 증가하는 것으로 나타났다. 슬래브와 기층의 다양한 탄성계수
와 두께를 사용하여 슬래브의 거동과 하중전달효율에 미치는 재료물성과 기하학적 형상의 영향을 분석하였다. 그
결과, 노상의 탄성계수는 기층의 탄성계수와 슬래브 및 기층의 두께보다 더 큰 영향을 미치는 것으로 나타났다. 또한,
양 또는 영의 온도구배에서보다는 음의 온도구배에서 슬래브의 거동과 하중전달효율이 더 민감하게 변화하였으며,
낮은 강성의 줄눈은 슬래브의 온도구배에 더 민감한 것으로 나타났다.

다국어 초록 (Multilingual Abstract)

Load transfer efficiency (LTE) reflects the structural performance of doweled and undoweled joints of Jointed Concrete Pavement (JCP). A 3-dimensional (3-D) model of JCP was built using ABAQUS software in this study. Three concrete slabs were placed on bonded sublayers composed of a base and subgrade. Spring elements were used to connect the adjacent slabs at joints. Different spring constants were input to the model to simulate different joint stiffness of the concrete pavement. The LTE of the joint increased with an increase of the spring constant. The effects of material properties and geometric shape on the behavior of JCP were analyzed using different elastic modulus and thickness of the slab and base in the modeling. The results showed the elastic modulus of the subgrade affected the behavior of the slab and LTE more than that of the base and the thickness of the slab and base. The effects of a negative temperature gradient on the behavior of the slab and LTE were more than that of positive and zero temperature gradients. Joints with low stiffness were more sensitive to the temperature gradient of the slab.

참고문헌 (Reference)

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