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Harada Lab
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The lab studies how fire spreads in buildings in order to design buildings that are safe against fire.
AboutAbout the lab
Understanding how fire works to design safe buildings
The Harada Lab studies how fires in buildings spread and how to design and construct buildings that are fire-safe from an engineering standpoint.
The lab investigates and models how combustibles burn and spread fire inside rooms, the combustibility of interior finishing materials, how smoke spreads in rooms, and the thermal behavior of structural members.
The fire resistance of timber buildings is also a research subject, and the lab conducts experiments and builds theoretical models.
To apply its results in practice, the lab also studies methods for performance-based fire safety design of buildings.
Key terms
- Free space
- An open space with no surrounding walls or ceiling. Combustion data obtained here is used as the basis for predicting combustion in rooms.
- Available safe egress time
- The time during a fire in which people can evacuate safely (available safe egress time).
- Self-extinguishing design
- A design approach in which, even if the surface of a wall chars, the fire on the surface dies out naturally and the interior remains, so the wall avoids collapse (self-extinguishing design).
NewsLab news
View More ↗ResearchResearch themes
The lab aims to clarify, through experiments and theoretical models, how fire spreads and how smoke travels inside buildings. Based on these results, it studies methods for designing and constructing buildings that are safe against fire.
*Illustrative imageFire prediction based on real building conditions
The types and arrangement of combustibles differ from room to room, so the severity of a fire is not uniform. The lab aims to predict how multiple combustibles burn together in a room and to use this for more reliable fire safety design.
*Illustrative imageHow combustibles burn inside rooms
Even the same object burns and spreads fire more intensely inside a room than in a free space without walls or ceilings. The lab is developing models that predict burning behavior in a room from combustion data obtained in free space.
*Illustrative imageFlame spread over combustible interior finishes
When wood or similar materials are used for interior finishes, there is concern that fire will spread along the material surface in the early stage of a fire. The lab predicts flame-spread behavior through experiments and uses modeled simulations to estimate the flame-spread speed and the available safe egress time.
*Illustrative imageFire resistance of large-section timber construction
Building large structures in timber requires fire resistance. In fire resistance tests on walls 100 mm thick, the surface chars but the interior remains sound. The lab studies the basic principle of self-extinguishing design: if the fire on the surface dies out naturally, the wall avoids collapse.
MembersFaculty
- ProfessorKazunori Harada
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Report an errorAbout the images
The top and research theme images are illustrative and were not taken at the lab. They are cropped from Wikimedia Commons images. Cropped CC BY-SA images are provided under the same CC BY-SA license as the original (version shown on each line).
- Top image: “Brandon Fire - July 2020 04” CAL FIRE / Public domain (cropped)
- Fire prediction based on real building conditions: “Spangdahlem Fire Department light up Fire Prevention Week (6383799)” U.S. Air Force photo by Senior Airman Melody Howley / Public domain (cropped)
- How combustibles burn inside rooms: “Rocaille room (Louvre) 1” Tangopaso / Public domain (cropped)
- Flame spread over combustible interior finishes: “Aerial ignition interior high rates of spread in open savannas” U.S. Fish and Wildlife Service / Public domain (cropped)
- Fire resistance of large-section timber construction: “Fire behavior in mass timber structures (20241017-FS-DP-1052)” Forest Service Photography / Public domain (cropped)
- Related lab (松山研究室): “Test fire-resistant glass” Николай Климин / CC BY-SA 3.0 (cropped)
- Related lab (土橋研究室): “Fire whirl (FWS) crop” U.S. Fish and Wildlife Service; cropped by Beyond My Ken (talk) 00:25, 17 September 2015 (UTC) / Public domain (cropped)
- Related lab (桑名研究室): “Deepwater Horizon offshore drilling unit on fire 2010” 作者不詳 / Public domain (cropped)
- Related lab (細川研究室): “Waterways in Charleston, South Carolina” NaturalNat / CC BY 4.0 (cropped)
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