SynopsisSeismic vibration analysis was made on two-and three-dimensional models of the No. ¢ blast furnace at the Kimitsu Works of JVippon Steel Corporation, using the seismic waves that had been recorded when a big earthquake occurred of the East Coast of the Izu peninsula. The study led to the establishment of appropriate seismic vibration analysis models to reproduce the observed seismic waves and the disclosure of the following facts. While combination of two-dimensional models is sufficient for the earthquake-resistant design of the furnace-supporting structure, three-dimensional models are necessaay for the furnace-top piping. While the connection of the furnace body and supporting structure at the furnace top induces the whiplash phenomenon, the connection of the top of the supporting structure and furnace-top piping serves as a means to reduce it. By elastoplastic analysis, it was also ascertained that the furnace-supporting structure had the ultimate lateral shear strength required by the Building Standards Law of Japan. I. IntroductionThe blast furnace is a huge, heavy-weight structure that comprises a furnace vessel, supporting structure, furnace-top piping and so on with different vibration characteristics. Accordingly, we have to fully grasp their vibration characteristics for the achievement of effective earthquake-resistant design. To satisfy this need, Nippon Steel has been continuing seismic observation on blast furnaces since 1975, along with dynamic tests on a small-scale blast furnace. ' In this paper we report the following points included in the series of studies so far conducted:(1) Establishment of a vibration analysis model that permits exact reproduction of a observed seismic waves (which were used in the study of the following three items).(2) Clarification of the usefulness and its limit of two-dimensional models in the vibration analysis model for use in designing earthquake-resistant structures and the necessity for three-dimensional models.(3) Clarification of the effect produced by the connection of the furnace, furnace-supporting structure and furnace-top piping.(4) Confirmation of the severe-earthquake resistance and safety of the furnace-supporting structure through elastoplastic analysis.
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