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Title |
Fire Resistance Behavior and Residual Capacity of Voided Slab Subjected to Fire According to Loading Condition
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Authors |
최현기(Hyun-Ki Choi) ; 배백일(Back-Il Bae) ; 정형석(Hyung-Suk Jung) ; 최창식(Chang-Sik Choi) ; 정주홍(Joo-Hong Choi) |
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DOI |
https://doi.org/10.11112/jksmi.2018.22.1.099 |
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Keywords |
중공슬래브 ; 잔류성능 ; 온도분포 ; 하중조건 Voided slab ; Residual capacity ; Thermal distribution ; Loading condition |
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Abstract |
This study presents experimental investigation on the residual capacity of fire-damaged voided slabs according to loading conditions. In this study, two voided slab specimens were fabricated, and heated by ISO standard fire during 120 minutes with different loading conditions of presence of loading. These specimens were cooled down to room temperature, and the residual capacity of fire-damaged voided slabs was investigated. Based on test results, thermal distribution of voided slab through the depth of concrete sections is different by the loading conditions. The temperature of loaded specimen is rapidly elevated through the whole depth of concrete sections compared to the unloaded specimen. The residual strength of fire-damaged voided slab specimens are 60% and 66% of that of voided slab specimen without fire damage, and the residual stiffness of fire-damaged voided slab specimens decreases by 15%~23% of that of voided slab specimen without fire damage. In case of voided slab specimens subjected ISO standard fire, the loaded specimen shows the decrease of 10% in the residual strength and the decrease of 15% in the residual stiffness compared to the unloaded specimen. It seems to result from higher temperature of bottom reinforcements in the loaded specimen due to the cracks, and more extensive damage on concrete cover of reinforcements by spalling process according to load level.
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