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Yamada-Iyama Lab
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The lab studies, through experiments and analysis, steel structures that remain usable after an earthquake.
AboutAbout the lab
Toward more reliable steel structures
The Steel Structures Lab studies seismic isolation and vibration control structures, with a focus on buildings made of steel frames (steel structures).
Its work covers a wide range, from steel as a material to members such as columns and beams, seismic isolation devices and dampers, and entire buildings.
Research proceeds through both experiments, such as shaking table tests and loading tests, and analysis, such as finite element analysis.
The lab aims to realize highly earthquake-resistant steel structures that can continue to be used even after a major earthquake.
Key terms
- Low-cycle fatigue
- A phenomenon in which metal fractures when large forces are applied repeatedly a small number of times.
- Local buckling
- Deformation in which part of the plate of a column or beam is compressed and ripples locally.
- Finite element analysis
- A method of dividing a shape into small elements and calculating forces and deformation by computer.
NewsLab news
A student received the Young Researcher Excellent Research Report Award at the Architectural Institute of Japan Kanto Chapter Research Meeting
A master's program graduate received the Young Researcher Excellent Presentation Award at the Architectural Institute of Japan Annual Meeting
A master's program student received the Young Researcher Excellent Presentation Award at the Architectural Institute of Japan Annual Meeting
A student received the Young Researcher Excellent Research Report Award at the Architectural Institute of Japan Kanto Chapter Research Meeting
ResearchResearch themes
The lab studies the performance of steel structures in architecture, from the steel material to members, joints, and entire buildings. It combines methods such as response analysis, finite element analysis, monitoring-based observation, and various experiments.
*Illustrative imageLow-cycle fatigue of steel
The lab conducts material tests that reproduce the repeated large strains experienced at places such as beam ends in a major earthquake. By developing a specimen shape that does not buckle even under large compression, it aims to capture the properties of steel just before it fractures.
*Illustrative imageRepeated small vibrations and the limits of members
To verify the safety of high-rise buildings when long-period ground motion continues for a long time, the lab conducts cyclic loading experiments at very small amplitudes and investigates the limit performance of steel members.
*Illustrative imagePredicting brittle fracture in welded joints
The electroslag-welded areas, where the inside of large square steel tube columns is welded, are said to be brittle and prone to fracture. In joint research with steel manufacturers, industry associations, and other universities, the lab studies how to predict this fracture and make it less likely to occur.
*Illustrative imageLocal buckling and earthquake resistance of square steel tube columns
Among the square steel tube columns most widely used in Japan, those that are thin relative to their plate width are known to undergo local buckling relatively early and then lose strength suddenly. The lab performs seismic response analysis with numerical models that reflect this behavior, and examines the strength a building needs according to the column's width-to-thickness ratio.
MembersFaculty
The members of the Steel Structures Lab consist of faculty, project researchers, collaborating researchers, secretaries, and doctoral, master's, and undergraduate students.As of 2026
- ProfessorSatoshi YamadaPublications ↗
- ProfessorJun IyamaPublications ↗
- Assistant ProfessorYoshiharu SatoPublications ↗
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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 structure” Wikideas1 / CC0 (cropped)
- Low-cycle fatigue of steel: “MetalFatigue 001” National Institute of Standards and Technology / Public domain (cropped)
- Repeated small vibrations and the limits of members: “I-beam raw material at WP Welding 5” W.carter / CC0 (cropped)
- Predicting brittle fracture in welded joints: “Welders 1963” WhatIDot / CC BY-SA 4.0 (cropped)
- Local buckling and earthquake resistance of square steel tube columns: “Steel frame building under construction in Taiwan” SSJF01 / CC0 (cropped)
- Related lab (Fujita Lab): “Zentsuji Zentsu-ji Garan Five-storied Pagoda 5” Zairon / CC BY 4.0 (cropped)
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