Abstract: This study investigates the impact of exterior building fires on both the internal automatic sprinkler system and fire-resistant glass. An experimental platform was developed, and 24 tests were conducted to assess the influence of water on the integrity of fire-resistant glass under simulated outdoor fire conditions. The findings reveal that in all 24 tests, the automatic sprinkler system was activated, and the fire-resistant glass's integrity was compromised. The temperature sensing elements ruptured at temperatures ranging from 84~87 ℃, significantly exceeding their nominal activation temperature of 68 ℃. The study also observed distinct rupture behaviors based on glass thickness: 5, 6, 8, and 10 mm glass panes shattered and detached upon rupture, whereas 12 mm and 15 mm glass panes remained intact as the rupture did not penetrate the glasses. To ensure the fire integrity of building external windows, it is necessary to comprehensively consider the layout of sprinkler heads in automatic sprinkler systems, the testing methods of temperature sensing components, and the selection of fire-resistant glass.

Key words: fire-resistant glass, outdoor fire, fire resistance integrity, automatic sprinkler system