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Structural Engineering Lab
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A lab that studies steel structures such as bridges from the perspectives of welding, thermal processing, and corrosion.
AboutAbout the lab
Studying welding, heating, and corrosion of steel structures
The Structural Engineering Lab studies steel structures such as bridges, focusing on thermal processing technologies such as welding and heating, the properties of steel, and corrosion and corrosion protection.
Through experiments and analysis, the lab investigates the forces and deformation that arise in members due to welding and heating, as well as the mechanical behavior of corroded steel plates.
The lab has exchanges with universities in Hungary, South Korea, and China, holding joint seminars and mutual visits.
The lab also organizes tours of bridge fabrication plants and repair sites.
Key terms
- Residual stress
- Stress that remains inside a member after welding or heating, even when no external force is applied
- High-yield-strength steel
- Steel with a high yield point, the stress at which permanent deformation begins. The type used for bridges is called SBHS
- Accelerated corrosion test
- A test run under harsher conditions to make corrosion such as rust progress in a short period of time
NewsLab news
A paper by Associate Professor Hirohata and colleagues won the FY2025 (Reiwa 7) JSCE Tanaka Prize (Paper Category)
A master's student was selected as an Outstanding Presenter at the JSCE Annual Meeting
A master's student received an Outstanding Presentation Award at the Steel Structures Symposium 2025
Master's and undergraduate students received the Kochikukai Award and the Engineering Award
A master's student received an Outstanding Presentation Award at the Steel Structures Symposium 2024 and other events
ResearchResearch themes
The Structural Engineering Lab studies steel structures such as bridges, focusing on thermal processing technologies such as welding and heating, the properties of steel, and the durability of corrosion protection against corrosion. Its research themes fall into four areas: applying thermal processing to maintenance, simulation of welding and thermal processing, investigation of steel and welded joints, and evaluation of corrosion and corrosion protection.
*Illustrative imageMaintenance of Steel Structures Using Thermal Processing
This research applies thermal processing technologies to the maintenance of steel structures. Work includes repair and reinforcement by welding, control of residual stress by local heat treatment, and development of techniques for removing anticorrosive coatings by heating.
*Illustrative imageSimulation of Welding and Thermal Processing
The lab uses simulation to study the mechanical phenomena that occur during welding and thermal processing. Topics include building models of laser-arc hybrid welding, evaluating cold cracking in welds, and clarifying residual stress distributions in various welded joints.
*Illustrative imageCharacteristics of Steel and Welded Joints
The lab investigates the performance of welded joints in high-yield-strength steel for bridges (SBHS), the material properties of steel from aged bridges, the mechanical properties of steel that has undergone thermal history in fires, and the mechanical characteristics of joints that combine welding and adhesive bonding.
*Illustrative imageDurability Evaluation of Corrosion and Corrosion Protection
The lab evaluates the durability of steel and its corrosion protection through accelerated corrosion tests. It also works on predicting the surface condition of corroded steel using deep learning.
MembersFaculty
The members of the Structural Engineering Lab consist of faculty, administrative assistants, project researchers, doctoral, master's, and undergraduate students, and short-term international students.As of 2026
- Associate ProfessorMikihito Hirohata
- Assistant ProfessorYoshinori Kamei
- Assistant ProfessorFeng Jiang
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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: “Fledborough viaduct welded steel bridge girders - geograph.org.uk - 4728457” Steve Fareham / CC BY-SA 2.0 (cropped)
- Maintenance of Steel Structures Using Thermal Processing: “Steel Bridge over the Dead River” Imzadi1979 / CC BY-SA 3.0 (cropped)
- Simulation of Welding and Thermal Processing: “White Mountains Community College Advanced Welding Teaching Lab” AMPedNH / CC BY 2.0 (cropped)
- Characteristics of Steel and Welded Joints: “STEEL GIRDER BRIDGE” Devilbose / CC BY-SA 4.0 (cropped)
- Durability Evaluation of Corrosion and Corrosion Protection: “Rust and dirt” Roger McLassus / CC BY-SA 3.0 (cropped)
- Related lab (Social Infrastructure Design Lab): “Whittier Bridge- Arch span deck is ready for concrete ( )” MassDOT / Public domain (cropped)
- Related lab (Water Engineering Lab): “The Szczecin Lagoon at the mouth of the Oder River (P- )” Copernicus Sentinel-2 imagery, EK - GD DEFIS, EC - DG DEFIS, SPACETEC PARTNERS, CE - DG DEFIS / CC BY 4.0 (cropped)
- Related lab (Ship and Offshore Structural Engineering Lab): “Agucadoura WindFloat Prototype” Untrakdrover / CC BY-SA 3.0 (cropped)
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