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Ikarashi Lab
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A structural engineering lab that investigates buckling, the phenomenon in which steel building members bend and fail when compressed.
AboutAbout the lab
Toward slender, light buildings that remain safe
The Ikarashi Lab studies the steel frames of buildings.
The field aims to design buildings that can withstand various forces such as earthquakes, wind, snow, and the building's own weight, making safer buildings possible.
The lab mainly deals with buckling, a phenomenon in which a slender bar or thin plate, when compressed, fails under a force far smaller than the strength of the material.
The lab places great importance on experiments, and even for one student's experiment, all members work together.
Key terms
- Building structures
- A field of architecture that designs building frames to withstand forces such as earthquakes, wind, snow, and self-weight.
- Buckling
- A phenomenon in which a slender bar or thin plate, when compressed, bends and fails under a force far smaller than the strength of the material.
- Steel structures
- Building frames made by assembling steel (steel-frame) members. This is the type of structure the Ikarashi Lab mainly deals with.
NewsLab news
A student received the Toka Award
Multiple students received the Excellent Presentation Award at the Steel Structures Symposium 2025
A graduate received the Architectural Institute of Japan Outstanding Master's Thesis Award
Multiple graduates received the Young Researcher Excellent Presentation Award at the Architectural Institute of Japan Annual Convention
A student received the Excellent Presentation Award at the Steel Structures Symposium 2024
ResearchResearch themes
Within the field of building structures, the lab mainly studies buckling in steel structures. Its goal is to face the buckling phenomenon squarely and make possible buildings that are slender and light as never seen before, yet sufficiently safe.
*Illustrative imageHow steel members buckle
The load capacity of steel beams and columns is sometimes governed by local buckling, in which thin plate parts bend locally. The lab investigates the loads at which buckling occurs and the failure modes in members such as H-shaped beams.
*Illustrative imageDuctility under repeated large earthquakes
When a beam is subjected to repeated large earthquakes, its ends gradually lose strength while bending. Through experiments and analysis, the lab examines how this strength degrades and how the beam finally fails, and is developing a method to evaluate these together.
*Illustrative imageStrength of joints connecting members
The lab investigates how much force beam-column joints and connections made with bolts and steel plates can withstand, and develops methods to estimate that strength.
MembersFaculty
The Ikarashi Lab's members consist of faculty, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorKikuo IkarashiPublications ↗
VoicesStudent voices
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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: “Steel frame building under construction in Taiwan” SSJF01 / CC0 (cropped)
- How steel members buckle: “Construction worker on steel framing of hollywoodHUB at Hollywood Transit Center, Portland, Oregon (January 2026)” PortlandAppraisalBlog / CC BY-SA 4.0 (cropped)
- Ductility under repeated large earthquakes: “StructuralTesting 020” National Institute of Standards and Technology / Public domain (cropped)
- Strength of joints connecting members: “Detail of typical beam - lateral bracing bolted connection. View to northeast. - 86th Street Overpass, Spanning Interstate 35 and 80 at Northwest Eighty-sixth Street, Urbandale, Polk HAER IA-42-15” Related names: Ashton, Edward L Pullman Standard Car Manufacturing Company Wegman-French, Lysa, transmitter / Public domain (cropped)
- Related lab (三井研究室): “2512-superstructure-métallique” Thierry Caro, pour le magazine 2512. / CC BY-SA 2.5 (cropped)
- Related lab (中野研究室): “2015.04 - Amsterdam, photo of a building site - An excavation at the Sarphatistraat for a new hotel; a geotagged free urban picture, in public domain Commons CCO; city photography by Fons Heijnsbroek, The Netherlands ( )” Fons Heijnsbroek from Amsterdam, Netherlands / CC0 (cropped)
- Related lab (山崎義弘研究室): “Byggnadsstomme2” Entheta / CC BY-SA 3.0 (cropped)
- Related lab (寺澤研究室): “Duxford UK Feb2005 American” Bluemoose / CC BY-SA 3.0 (cropped)
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