For the structural analysis of reinforced concrete structures, the mechanical properties of concrete at different temperatures are required. These mechanical property values relative to specific concrete temperatures can be presented in design regulations and codes. In this study, the mechanical properties of concrete were experimented by using 35 MPa concrete produced in Korea from 20 ℃ to 900 ℃. Comparing the results with previous domestic papers, we aimed to contribute to the construction of a database of the mechanical characteristics of domestically produced concrete at elevated temperatures, which can be used for structural analysis in case of fire emergencies.

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According to building regulations, fire dampers should be installed in or close to the part of the duct that penetrates the fire compartment. Accordingly, in construction sites, fire dampers are installed in or adjacent to the fire compartment wall and floor. However, they are often installed too far away from the fire compartment wall and floor because the law does not stipulate a clear standard for “close”. If this occurs, the duct and sleeve in the spaced part may be transformed by the high heat of a fire. Through this, smoke and flames can be directly transmitted to the neighboring compartment space, failing to ensure fire safety. Therefore, this study investigated the dependence of fire safety on the spaced installation of fire dampers by performance verification. From the performance verification results, it was found that the separation distance of the fire damper should be minimized (i.e., attached to the wall) to ensure fire safety.

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