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Title |
Structural Behavior of RC Roof Slab under Cyclic Temperature Load
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Keywords |
온도 ; 철근콘크리트 지붕 슬래브 ; 구조성능 ; 반복온도모델 ; 반복하중 ; 파괴실험 Temperature ; RC roof slab ; Structural capacity ; Cyclic temperature model ; Cyclic loading ; Fracture test |
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Abstract |
A variation of temperature acting on a RC roof slab causes a change of stress in concrete since it expands during summer and is compressed during winter. This behavior repeats annually and makes an affection to the structural capacity of member for both serviceability and ultimate level. In this paper, a cyclic temperature loading variation is calculated by analyzing the weather data of Korea for 20 years. In addition, an experimental work is planned to find the long term effect of temperature variation. Six RC slab are made with same dimension. Test parameters are loading duration (10, 20, 30 year) and whether it has pre-damage or not. Observation of stiffness variations according to cyclic loading period shows that the serious stiffness drop happens after 10 year's cyclic loading at summer while after 30 year's loading at winter. From the fracture test about slabs damaged by long term cyclic loading, however, the capacity of member such as initial stiffness and maximum strength were not changed except yield strength according to the period of long term cyclic loading. The yield strength tends to decrease after 20 year's cyclic loading.
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