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Building Structures Lab (Tomokazu Yoshioka)
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A building structures lab that explores technologies for protecting buildings from earthquakes, including friction dampers.

AboutAbout the lab
Making earthquake-resistant buildings through structural ingenuity.
The building structures lab develops new technologies and construction methods to improve the seismic safety of buildings.
It works on increasing friction in friction joints, developing new friction dampers, and developing new construction methods that use friction dampers to reduce earthquake damage.
In education, the lab is in charge of lectures and exercises in structural mechanics of buildings, seismic structures, structural design of buildings, and earthquake disaster prevention.
Student research supervision centers on developing technologies that contribute to building safety, proposing new design methods, and seismic performance evaluation and seismic retrofitting of existing buildings.
Key terms
- Friction damper
- A device that uses friction to reduce earthquake damage to buildings
- Reinforced concrete
- Concrete reinforced with steel bars. Used in structures such as the columns and walls of buildings
- Deep learning
- A method in which a computer learns features by itself from large amounts of data. Used for tasks such as image recognition
ResearchResearch themes
The lab develops technologies and construction methods to reduce earthquake damage to buildings. In addition to research on friction dampers and reinforced concrete walls, it studies estimating damage levels from photos of earthquake damage using deep learning.
Replaceable Vibration-Control Mullion Walls
The lab is developing lightweight precast reinforced concrete (PCaRC) vibration-control mullion walls designed for retrofitting and replacement. It investigates the seismic behavior of vibration-control mullion walls that use friction dampers in reinforced concrete structures.
*Illustrative imagePost-Earthquake Damage Assessment
The lab studies methods for simply assessing the damage level and repair cost of earthquake-damaged multi-unit residential buildings. Its research keywords are multi-unit residential buildings, earthquake damage, damage level, and continued use.
Friction Slip Dampers with High-Strength Bolts
The lab studies friction slip dampers that use high-strength bolts. It conducts experiments on joints that use plates of materials such as aluminum alloy as the sliding material. Its research keywords also include damage control.
Damage Estimation from Earthquake Damage Photos
The lab has published papers on estimating the damage level of reinforced concrete columns from earthquake damage photos using deep learning, and on measuring crack widths from damage photos through image analysis.
MembersFaculty
- ProfessorTomokazu Yoshioka
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: “Tuned mass damper - Taipei 101 - Wikimania” guillom / CC BY-SA 3.0 (cropped)
- Post-Earthquake Damage Assessment: “Heavily damaged apartment buildings after 7,8 massive earthquake in Turkey” Adem / CC BY-SA 4.0 (cropped)
- Related lab (Building Structural Engineering Lab): “Queensland State Archives 3658 South approach reinforced concrete column construction Brisbane 29 April 1936” Lands Department, Survey Office, Cartographic Branch, Photographic Section / Public domain (cropped)
- Related lab (Building Construction Planning Lab): “Sky Balcony riveted steel beam detail Hamasen Railway Cultural Park Kaohsiung” The Nature Box / CC0 (cropped)
- Related lab (Architectural Construction and Planning Lab (Asao Inoue)): “Illuminated facade of a restaurant serving traditional food with fresh vegetables in Chiyoda, Tokyo” Basile Morin / CC BY-SA 4.0 (cropped)
- Related lab (Architectural Design Lab): “Asia Museum of Modern Art on the campus of Asia University” YangChen(TW) / CC BY 2.0 (cropped)
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