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http://dx.doi.org/10.11112/jksmi.2010.14.2.067

Structural Behavior of RC Roof Slab under Cyclic Temperature Load  

Seo, Soo-Yeon (충주대학교 건축공학과)
Yoon, Seung-Joe (충주대학교 건축공학과)
Cho, Yong-Man ((주)크로스구조연구소 기술사사무소)
Choi, Gi-Bong (경원대학교 건축공학과)
Publication Information
Journal of the Korea institute for structural maintenance and inspection / v.14, no.2, 2010 , pp. 67-74 More about this Journal
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.
Keywords
Temperature; RC roof slab; Structural capacity; Cyclic temperature model; Cyclic loading; Fracture test;
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