| Co-Investigator(Kenkyū-buntansha) |
IGARASHI Akira Department of Civil Engineering System, Kyoto Univ.Associate Professor, 工学研究科, 助教授 (80263101)
SAWADA Sumio Department of Civil Engineering System, Kyoto Univ.associate Professor, 防災研究所, 助教授 (70187293)
TAMURA Takeshi Department of Civil Engineering System, Kyoto Univ.Professor, 工学研究科, 教授 (30026330)
SATO Tadanobu Disaster Prevention Research Inst., Kyoto UNiv.Professor, 防災研究所, 教授 (00027294)
IEMURA Hirokazu Department of Civil Engineering System, Kyoto Univ.Professor, 工学研究科, 教授 (10026362)
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| Research Abstract |
A higher level of design seismic force is used in the recent design standards for the civil engineering structures. This enhancement of the seismic design requirement is occasionally problematic for the state-of-the-art large-scale structures since it can render the reasonable member design impossible. In some cases, it has also resulted in the requirement for improved seismic performance of existing structures. In this study, the dynamic response control of structures is investigated as a measure to reduce the seismic response, with particular emphasis on the clarification of the performance requirements for the control devices, and suitable control algorithm, for the application to the long-span bridges, nuclear power plants, off-shore floating airport structures etc. It is of main concern to develop the solution to the problems associated with the application of the control devices to those structures.
The following achievements have been made.
- Several types of control devices for floating structures are proposed, and the efficiency of the systems under the sea wave excitation is compared.
- In order to investigate into the seismic performance of structures in the plastic range, numerical simulations are conducted with several control device capacity.
- The influence of the phase characteristics of random excitation to the structures with response control devices is investigated in detail, as well as that of the amplitude characteristics. A control algorithm was derived in order to incorporate the real-time evaluation of the effect of the nonstationarity of the seismic input. A methodology to estimate the amplitude of the dynamic response of the structures relative to the ground displacement or the sea water particle motion is developed.
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