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Watakabe, Tomoyoshi; Yamamoto, Tomohiko; Fukasawa, Tsuyoshi*; Okamura, Shigeki*; Somaki, Takahiro*; Morobishi, Ryota*; Sakurai, Yu*; Kato, Koji*
Nihon Kikai Gakkai Rombunshu (Internet), 83(850), p.16-00444_1 - 16-00444_14, 2017/06
A seismic isolation system composed of a thick rubber bearing and an oil damper has been developed for Sodium-Cooled Fast Reactor. This paper focused on the aging properties of thick rubber bearings, such as basic mechanical properties and ultimate strength. Aging of the rubber bearings was reproduced using thermal degradation based on Arrhenius law.
Watakabe, Tomoyoshi; Yamamoto, Tomohiko; Fukasawa, Tsuyoshi*; Okamura, Shigeki*; Somaki, Takahiro*; Morobishi, Ryota*; Sakurai, Yu*; Kato, Koji*
Proceedings of 2016 ASME Pressure Vessels and Piping Conference (PVP 2016) (Internet), 8 Pages, 2016/07
A seismic isolation system composed of a thick rubber bearing and an oil damper has been developed for Sodium cooled Fast Reactor. One of the advantages of the isolation system is employing the thick rubber bearing in order to realize the longer vertical natural period of a plant, and it leads to mitigation of seismic loads to mechanical components. Rubber bearing technology has progressed based on many past studies, but test data regarding an aging effect is not enough. Also, there is no data of linear strain limit and breaking behavior for the thick rubber bearing after aging. This paper focuses on aging properties of the thick rubber bearing, such as basic mechanical properties and ultimate strength. An aging promote test of the thick rubber bearing was performed by using 1/2 scale and 1/8 scale rubber bearings. Aging of the rubber bearing was reproduced by thermal degradation, where the target aging period was 30 years and 60 years. The load deflection curves of the thick rubber bearing after aging were obtained through the horizontal and vertical static loading tests, and the aging effect was evaluated by comparing with the initial mechanical properties.
Hirayama, Tomoyuki*; Yamamoto, Tomohiko; Morobishi, Ryota*; Yukawa, Masaki*; Nakamura, Misaki*
no journal, ,
Among the elements that make up the three-dimensional seismic isolation device, we report the results of element tests on the disc spring unit that provides the vertical seismic isolation effect, and the sliding element that enables vertical sliding motion while receiving a horizontal load.
Yukawa, Masaki*; Morobishi, Ryota*; Yamamoto, Tomohiko; Hirayama, Tomoyuki*; Yokoi, Shinobu*
no journal, ,
A half-scale combined test specimen was fabricated for a three-dimensional seismic isolation device in which thicker laminated rubber bearing and disc spring units are arranged in series, and a static loading test was carried out by simultaneous loading in both the horizontal and vertical directions. The test results demonstrated that this three-dimensional seismic isolation device maintained the specified design performance and smooth operation, and the device concept was established.
Somaki, Takahiro*; Morobishi, Ryota*; Fukasawa, Tsuyoshi*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Okamura, Shigeki*
no journal, ,
no abstracts in English
Morobishi, Ryota*; Somaki, Takahiro*; Fukasawa, Tsuyoshi*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Okamura, Shigeki*
no journal, ,
no abstracts in English
Morobishi, Ryota*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Uchita, Masato*; Yamamoto, Tomohiko; Miyazaki, Masashi; Watakabe, Tomoyoshi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
Morobishi, Ryota*; Yukawa, Masaki*; Hirayama, Tomoyuki*; Miyagawa, Takayuki*; Yamamoto, Tomohiko; Miyazaki, Masashi; Fukasawa, Tsuyoshi*
no journal, ,
no abstracts in English
