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Earthquake Engineering Lab
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A lab studying both structural and non-structural ways to protect infrastructure from earthquakes.
AboutAbout the lab
Protecting people's lives through earthquake disaster prevention and mitigation.
The Earthquake Engineering Lab studies how to minimize earthquake damage to infrastructure.
Japan is one of the most earthquake-prone countries in the world, and people there always live close to the danger of earthquake disasters.
To keep damage to a minimum when a disaster strikes and to protect human life above all, the lab works to improve the seismic performance of structures and to develop new technologies and materials.
Earthquake engineering deals with how seismic motion travels through the ground, how underground and aboveground structures move during an earthquake, and how existing structures can be strengthened.
Focusing mainly on bridges, the lab investigates, through both theory and experiments, the seismic response analysis of entire bridges and the safety of abutments, taking into account girder pounding and the soil behind the abutment.
The lab also works on assessing how much safety margin already-deteriorated bridges still have, as well as on reliability-based design and seismic risk analysis.
Including the use of artificial intelligence, the lab advances research on disaster prevention and mitigation from both the hardware and software sides.
Key terms
- Infrastructure
- Facilities such as roads, bridges, and water supply and sewer systems that support people's lives and economic activity
- Seismic isolation
- A construction method that places easily deformable devices at the base so that earthquake shaking is less likely to be transmitted to a building or bridge
- Vibration control
- A construction method that incorporates devices that absorb the energy of shaking to reduce vibration during an earthquake
NewsLab news
A paper by Professor Yukihide Kajita and colleagues was published in the Journal of the Japan Society of Erosion Control Engineering
A paper by Professor Yukihide Kajita and colleagues was published in Buildings
A paper by Professor Yukihide Kajita and colleagues was published in the Journal of Japan Society of Civil Engineers
A paper by Professor Yukihide Kajita and colleagues was published in Structures
ResearchResearch themes
Aiming to improve the seismic safety of infrastructure, the lab carries out analysis and experiments on seismic-resistant design, seismic isolation, and vibration control methods, evaluating the validity and applicability of each method in order to lead to practical use. It also continues software-side research that predicts damage in advance and presents it as hazard maps, raising residents' disaster awareness and encouraging early evacuation. Recently, it has been working on a framework for updating the physical property values of bridge piers and bearings by Bayesian estimation, immediate assessment of earthquake damage using laser surveying, and seismic response analysis of bridges that takes soil-structure interaction into account. Experiments use equipment such as a biaxial shaking table, a combined loading apparatus, a weight-drop testing device, a reaction wall and reaction floor, and high-speed cameras.
View More ↗MembersFaculty
The members of the Earthquake Engineering Lab are faculty, technical staff, and master's and undergraduate students.
- ProfessorYukihide Kajita
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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: “View of the Five-storied Pagoda from the Lotus Pond, Tō-ji Temple, Kyoto” Jakub Hałun / CC BY 4.0 (cropped)
- Related lab (地盤工学研究室): “Geotechnical equipment in Bellevue, WA” SounderBruce / CC BY-SA 4.0 (cropped)
- Related lab (災害数理研究室): “Tsunami simulations Ofunato City” Ōfunato City, Prefecture Iwate, Japan / CC BY 3.0 igo (cropped)
- Related lab (防災地盤工学研究室): “Road failure from slope instability in Shasta-Trinity National Forest” Shopstone / CC0 (cropped)
- Related lab (資源循環・廃棄物工学研究室): “Waste disposal-landfill” Mumtahina Rahman / CC0 (cropped)
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