長期地震観測記録の分析に基づく免震構造物の振動性状同定に関する研究

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  • Study on Vibrational Characteristics Identification of Seismic Isolated Structure Based on Analysis of Long Term Seismic Observation Records

抄録

<p>Japan is an earthquake prone country in the world. In particular, the Southern Hyogo prefecture earthquake occurred in 1995, and about 105,000 houses were completely collapsed. Accordingly, seismic technologies have been actively studied and developed. Within them, seismic isolation system dealt in this paper is one of the effective technologies. The seismic isolation system isolates a structure from the ground. Thereby, acceleration input to the structure can be reduced. Although, seismic isolated structures are very few compared to the total number of structures, seismic response of seismic isolated structures is recording in many cases. However, there are few cases of long term seismic observations. In order to improve seismic safety, authors consider useful to obtain seismic records and long term evaluation of seismic isolated structures in many earthquakes. In this study, the authors deal with a seismic isolation structure that continues seismic observation from December 2011 up to the present. In this paper, the authors investigated relationship between the spectrum intensity and the natural frequency of the target building by using seismic records. Moreover, the authors evaluated relationship between the natural frequency and the damping ratio of the target building. Next, the authors constructed the analytical model of the target building. The authors proposed the method that can be modified the physical parameters by using the above relationships in constructing the analytical model. After that, the seismic records and the analytical results that were obtained from constructed analytical model were compared. Consequent upon that analysis, the authors confirmed high accuracy of the analytical model.</p>

収録刊行物

  • 年次大会

    年次大会 2018 (0), J1010202-, 2018

    一般社団法人 日本機械学会

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