Structural Engineering and Mechanics

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Bound of aspect ratio of base-isolated buildings considering nonlinear tensile behavior of rubber bearing

  • Hino, J. (Department of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University) ;
  • Yoshitomi, S. (Department of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University) ;
  • Tsuji, M. (Department of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University) ;
  • Takewaki, I. (Department of Urban & Environmental Engineering, Graduate School of Engineering, Kyoto University)
  • Received : 2008.01.21
  • Accepted : 2008.07.31
  • Published : 2008.10.20
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Abstract

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.

Keywords

References

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