FIRE RESISTANCE OF A STEEL PLATE REINFORCED CONCRETE BEARING WALL

Samples from a steel plate reinforced concrete bearing wall composed of concrete slab sandwiched between studded steel plates, were subjected to loaded fire resistance tests. There were two types of specimens: some were 1800 mm high while the rest were 3000 mm high; thickness and width were the same for all specimens, at 200 mm and 800 mm, respectively. Under constant load conditions, one side of each specimen was heated along the standard fire-temperature curve. The results enabled us to approximate the relationship between the ratio of working load to concrete strength N/(Ac×cσb) and the fire resistance time (t: minutes), as equation (1) for the 1800 mm - high specimen, and equation (2) for the 3000 mm - high specimen. N/(Ac×cσb)=2.21×(1/t)^ (1), .N/(Ac×cσb)=2.30×(1/t)^ (2) In addition, the temperature of the unheated side of the specimens was 100℃ at 240 minutes of continuous heating, clearly indicating that there was sufficient heat insulation.