We develop innovative and high-performance seismic response control devices for civil structures to ensure higher earthquake resistance of civil structures against future-expected extreme seismic events such as the Nankai Megathrust Earthquake.
We successfully develop an inerter-damper device that achieves more than 7,000 tons of apparent mass with a physical mass of 800 kgs. A tuned mass damper-like system designated the tuned viscous mass damper comprises the inerter-damper device and a tuning spring element, which is utilized in several high-rise buildings in Sendai and Tokyo.
Torsional collapse of high-rise buildings is explored. Bifurcation of asymmetric torsional deformation can occur in a high-rise steel moment resisting frame when subjected to a massive earthquake even if it has symmetric plan and very small eccentricity. Countermeasure technologies to prevent this phenomenon is persued.
Kohju Ikago, Kenji Saito, Norio Inoue (2012) Seismic control of single-degree-of-freedom structure using tuned viscous mass damper, Earthquake Engineering and Structural Dynamics, 41; 453-474., doi:10.1002/eqe.1138.
Kohju Ikago, Yoshifumi Sugimura, Kenji Saito, Norio Inoue (2012) Modal Response Characteristics of a Multiple-Degree-Of-Freedom Structure Incorporated with Tuned Viscous Mass Dampers, Journal of Asian Architecture and Building Engineering, 11(2); 375-382.
Takehiko Asai, Yoshikazu Araki, Kohju Ikago (2017) Energy Harvesting Potential of Tuned Inertial Mass Electromagnetic Transducers, Mechanical Systems and Signal Processing, 84; Part A, 659-672.
Ruiyang Zhang, Brian M. Phillps, Shun Taniguchi, Masahiro Ikenaga, Kohju Ikago (2016) Shake table real-time hybrid simulation techniques for the performance evaluation of buildings with inter-story isolation, Structural Control and Health Monitoring, 24(10); 2016; e1971; DOI:10.1002/stc.1971.
Takehiko Asai, Yoshikazu Araki, Kohju Ikago (2018) Structural control with tuned inertial mass electromagnetic transducers, Structural Control and Health Monitoring, 25(2); e2059, DOI: 10.1002/stc.2059