FLEXURAL BEHAVIOR OF STEEL-TIMBER-CONCRETE COMPOSITE SLAB EXPOSED TO TWO HOURS UNDER STANDARD FIRE

Cross Laminated Timber(CLT) is an eco-friendly building material that contributes to carbon neutrality by storing carbon dioxide, and it has been increasingly used in the construction of high-rise timber structures in countries such as the United States, Australia, and Canada. In Korea, during high-rise construction, deck plates are typically lifted to the upper floors using cranes and then positioned manually. Due to this process, the application of Steel-Timber-Concrete(STC) slabs composed of six layers of CLT faces limitations in Korea. Therefore, this study aims to experimentally and analytically evaluate the thermal behavior and fire-induced flexural performance of the proposed STC slab to assess its applicability to high-rise timber structures. As a result, the Steel-Timber-Concrete Joist Z section(STCJZ) slab with concrete joists demonstrated excellent fire resistance even after two hours of exposure to standard fire, suggesting its potential applicability in high-rise timber structures.