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Structural Engineering and Mechanics   Volume 30, Number 3, October20 2008, pages 351-368
DOI: https://doi.org/10.12989/sem.2008.30.3.351
 
Bound of aspect ratio of base-isolated buildings considering nonlinear tensile behavior of rubber bearing
J. Hino, S. Yoshitomi, M. Tsuji and I. Takewaki

 
Abstract     [Buy Article]
    The purpose of this paper is to propose a simple analysis method of axial deformation of base-isolation rubber bearings in a building subjected to earthquake loading and present its applicability to
the analysis of the bound of the aspect ratio of base-isolated buildings. The base shear coefficient is introduced as a key parameter for the bound analysis. The bound of the aspect ratio of base-isolated
buildings is analyzed based on the relationship of the following four quantities; (i) ultimate state of the tensile stress of rubber bearings based on a proposed simple recursive analysis for seismic loading, (ii) ultimate state of drift of the base-isolation story for seismic loading, (iii) ultimate state of the axial compressive stress of rubber bearings under dead loads, (iv) prediction of the overturning moment at the base for seismic loading. In particular, a new recursive analysis method of axial deformation of rubber bearings is presented taking into account the nonlinear tensile behavior of rubber bearings and it is shown that the relaxation of the constraint on the ultimate state of the tensile stress of rubber bearings increases the limiting aspect ratio.
 
Key Words
    base-isolation; bound of building aspect ratio; analysis of axial deformation of rubber bearing; recursive analysis; nonlinear uplift; base shear coefficient.
 
Address
J. Hino, S. Yoshitomi, M. Tsuji and I. Takewaki: Dept. of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyotodaigaku-Katsura, Nishikyo, Kyoto 615-8540, Japan
 

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