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Structural Safety Planning Lab (Hirashima)
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The lab uses experiments and analysis to explore how far timber columns and beams can withstand fire.
AboutAbout the lab
Toward timber building structures that withstand fire.
The Hirashima Lab specializes in building structures and fire, and studies structural fire engineering.
The lab investigates, through experiments and numerical analysis, how many hours timber columns and beams can withstand a fire.
To address fire safety, a key problem when building large-scale buildings out of timber, the lab aims to establish design methods for fire resistance performance.
Key terms
- Structural glulam (glued laminated timber)
- Wood made by stacking thin boards in layers and bonding them with adhesive so that it can be used for columns and beams
- Charring
- The process in which wood burns and turns into black char from the surface inward. The charred part has difficulty bearing loads
- Buckling
- A phenomenon in which a slender column, under a compressive force from above, suddenly bends sideways
NewsLab news
A student received the Young Researcher Outstanding Presentation Award in the Structures division (Timber Structures) at the Architectural Institute of Japan (AIJ) Annual Meeting
A student received the Young Researcher Outstanding Presentation Award in the Structures and Fire Safety divisions at the Architectural Institute of Japan (AIJ) Annual Meeting
Assistant Professor Marina Totsuka received the Gold Award at the 6th Research Results Presentation Meeting of the Taisei Academic Foundation
A student received the Young Researcher Outstanding Presentation Award in the Fire Safety division at the Architectural Institute of Japan (AIJ) Annual Meeting
A student's research was selected for the collection of outstanding research reports at the AIJ Kanto Chapter Research Presentation Meeting
ResearchResearch themes
The lab aims to establish design methods for fire resistance performance so that timber structures can be used in large buildings. It conducts fire resistance experiments and numerical analysis on timber columns, beams, and their joints.
*Illustrative imageFire resistance of glulam columns and beams
The lab conducts experiments in which large-section structural glulam columns and beams are subjected to fire heating and loads. It is developing a numerical analysis tool that predicts the time until charring advances from the surface, the cross-section shrinks, strength drops, and buckling or failure occurs.
*Illustrative imageFire resistance of column-beam joints
Even if the columns and beams remain intact, a building can collapse if the joints fail first. The lab conducts fire resistance experiments on timber structural frames that include joints, and investigates how the joints fail.
MembersFaculty
- ProfessorTakeo Hirashima
- Assistant ProfessorMarina Totsuka
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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: “Onex-StMartin-intérieur-11” MHM55 / CC BY-SA 4.0 (cropped)
- Fire resistance of glulam columns and beams: “Fire behavior in mass timber structures (20241017-FS-DP-1052)” Forest Service Photography / Public domain (cropped)
- Fire resistance of column-beam joints: “Steel with fireproof coating” User:MADe / CC BY-SA 2.0 be (cropped)
- Related lab (Structural Safety Planning Lab (Harada)): “Steel Frame Commercial Building Under Construction, Ann Arbor Township, Michigan” Dwight Burdette / CC BY 3.0 (cropped)
- Related lab (Structural Safety Planning Lab): “Steel skeleton fabrication - geograph.org.uk - 4033831” Stephen Middlemiss / CC BY-SA 2.0 (cropped)
- Related lab (Structural Safety Planning Lab (Nakamura)): “UCSD-JacobsSchool-20230406-Shake table-Tallwood-sunset-05308-DNG dxo-8MP” Jacobs School of Engineering / CC BY 2.0 (cropped)
- Related lab (Takahashi Lab): “Snow coming off roof of seasonal house. (412a3f0d63ca4890a37f6399a750f29a)” Lee Snook (MORA) / Public domain (cropped)
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