免震建物の限界アスペクト比の解析 : その2:積層ゴムの引張域における非線形特性を考慮した簡易解析

概要

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The purpose of this paper is to propose a simple analysis method of axial deformation of laminated rubber bearings in a base-isolated 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 tensile stress of rubber bearings for seismic loading, (ii) ultimate state of drift in the base- isolation story for seismic loading, (iii) ultimate state of 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 tensile ultimate state of rubber bearings increases the limiting aspect ratio. It is also shown that there exists an optimal size of rubber bearings to attain the maximum allowable aspect ratio.
一般社団法人日本建築学会の論文
2009-03-27