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Makoto Yamakawa,Mitsuki Nihei,Masahiko Tatibana,Kyouzou Hukazawa,Makoto Ohsaki,Takuzo Nakamura,Hiroyuki Yamanouchi 대한기계학회 2015 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.29 No.4
In seismic design of building frames, dampers are designed to absorb an earthquake's energy. Conventional steel tension braces havedisadvantages, such as pinching or deterioration of stiffness and strength under cyclic loading. A new type of elasto-plastic damper canpotentially avoid such disadvantages at a relatively low cost. Main characteristics of the damper are twofold: i) hardening effect causedby geometric nonlinearity, and ii) asymmetric hysteretic restoring force in tensile and compressive loading conditions. The objective ofthe study is to present a constitutive model and identify the corresponding parameters. The process of parameter identification of themodel is formulated as a non-smooth optimization problem and derivative-free optimization methods are suited for the problem. Throughnumerical examples, we investigate the seismic response reduction property of the damper. The results demonstrate the effectiveness ofthe optimization approach.