Research on Flashover Prediction Method of Large-Space Timber Structures in a Fire

Area of Science:

• Fire Science
• Structural Engineering
• Risk Assessment

Background:

• Large-space timber structures are susceptible to flashover fires due to material flammability and large volumes.
• Flashover fires pose a substantial threat to life safety and structural integrity.

Purpose of the Study:

• To investigate critical conditions, control factors, and prediction methods for flashover fires in large-space timber structures.
• To develop a model for predicting flashover occurrence and time.

Main Methods:

• Simulations using the Fire Dynamics Simulator (FDS) under various conditions (space size, heat release rate, fire growth type).
• Development of a temperature-time model for maximum smoke layer temperature (T).
• Determination of critical conditions for flashover prediction using the T model.

Main Results:

• A temperature-time model for the maximum smoke layer temperature (T) was established.
• The critical condition for predicting flashover using the T model was identified.
• A mathematical formula accurately predicts flashover induction time when T exceeds 400 °C.

Conclusions:

• The developed model and formula provide a reliable method for predicting flashover in large-space timber structures.
• This research offers valuable insights for performance-based fire safety design.
• The findings contribute to mitigating risks associated with flashover fires in timber constructions.