Abstract
In this study, full-scale fire tests and finite element (FE) analyses are conducted to investigate the fire resistance performance of hollow-core slabs (HCSs) manufactured using the extrusion method. The deflection of the HCS specimens and the temperature distribution in the section according to the fire exposure time are measured and analyzed comprehensively, and the test results are compared with the FE analysis results. In addition, parametric analyses are conducted on 21 cases with the HCS depth, span length, hollow ratio in a section, cover thickness of concrete, and load ratio (i.e., the ratio of the external load to the ultimate load) as variables, based on which the fire resistance performance of the HCS according to each variable is investigated. The analysis results show that the load ratio is a key factor governing the fire resistance behavior of HCSs, whereas the effects of the cover thickness of concrete and the hollow ratio in a section are relatively slight within the range of variables examined in this study.
Highlights
The precast concrete (PC) method has garnered significant interest, and its demand in the construction field has increased [1,2]
The deflection tended to decreased as the hollow-core slabs (HCSs) depth increased. This is because the heat transfer rate within the cross-section decreased as the heat capacity of the HCS section increased at the same time when the flexural stiffness of the section increased significantly as the depth increased
An finite element (FE) analysis was conducted on the HCS under fire, and the rationality of the FE model was verified via comparison with the test results
Summary
The precast concrete (PC) method has garnered significant interest, and its demand in the construction field has increased [1,2]. SYS to evaluate the fire performance in realistic load scenarios exist in structures They clearly that thethat firethe resistance was higher underunder realistic fire parking structures. A full-scale fire resistance test was conducted on an HCS manufactured in an actual precast factory and used in practice. The deflection of the specimens according to the fire exposure time and the temperature distribution inside the concrete section were measured and analyzed comprehensively, and the fire resistance performance of the HCS specimens was evaluated based on the criteria presented in ISO 834-1 (International Organization for Standardization) [32]. FE analysis was performed considering heat transfer and material properties that change according to temperature, and the rationality of the FE model was verified by comparing it with the actual temperature and structural behaviors of the HCS specimens. The fire resistance performance of the HCS according to each variable was evaluated and discussed comprehensively
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