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10010670
Comparative Study of Seismic Isolation as Retrofit Method for Historical Constructions
Abstract:
Seismic isolation can be used as a retrofit method for historical buildings with the advantage that minimum intervention on super-structure is required. However, selection of isolation devices depends on weight and stiffness of upper structure. In this study, two buildings are considered for analyses to evaluate the applicability of this retrofitting methodology. Both buildings are located at Akita prefecture in the north part of Japan. One building is a wooden structure that corresponds to the old council meeting hall of Noshiro city. The second building is a brick masonry structure that was used as house of a foreign mining engineer and it is located at Ani town. Ambient vibration measurements were performed on both buildings to estimate their dynamic characteristics. Then, target period of vibration of isolated systems is selected as 3 seconds is selected to estimate required stiffness of isolation devices. For wooden structure, which is a light construction, it was found that natural rubber isolators in combination with friction bearings are suitable for seismic isolation. In case of masonry building elastomeric isolator can be used for its seismic isolation. Lumped mass systems are used for seismic response analysis and it is verified in both cases that seismic isolation can be used as retrofitting method of historical construction. However, in the case of the light building, most of the weight corresponds to the reinforced concrete slab that is required to install isolation devices.
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References:

[1] Kazuhiro Hatada and Carlos cuadra, Dynamic response of low‐rise building with different base isolation devices, 15th European Conference on Earthquake Engineering, Istanbul, Turkey, paper No.397 (2014)
[2] C. Cuadra & y. Furui; Preliminary study for retrofitting of a historical wooden structure using base isolation system, International Journal of Heritage Architecture, Volume 2 (2018), Issue 1, pp 81-89, Paper DOI: 10.2495/HA-V2-N1-81-89
[3] Carlos Cuadra, “Dynamic Characteristics of Historic Noshiro City Assembly Hall, Japan”, IABSE Conference Nara 2015: Elegance in Structures, Paper HS-12, May 13-15, 2015.
[4] C.H. Cuadra and K. Tokeshi; “Seismic Vulnerability of a historical masonry building located in Akita prefecture, Japan”, Safety, Reliability and Risk of Structures, Infrastructures and Engineering Systems, Proceedings of the Tenth International Conference on Structural Safety and Reliability (ICOSSAR2009), Osaka, Japan, 13-17 September 2009, Abstract pp. 725. CD-ROM paper.
[5] C. Cuadra, K. Tokeshi, M.B. Karkee, Y. Sakaida; “Earthquake Resistance of a historical brick building in Akita Prefecture, Japan”, Book chapter, Heritage Masonry: Materials and Structures, WIT Press 2014.
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