高減衰積層ゴムを用いた建物免震システムの終局耐力に関する研究 : 第2報, 実大免震システムの終局耐力に関する解析

概要

論文の詳細を見る
The ultimate strength of a full-scale seismic isolation system which used multiple (n×n layers) high damping rubber bearings was analyzed by applying an analytical method. The method consisted of analyzing the response of the rubber bearings and evaluating the result in comparison with breaking conditions. It was determined that the system's ultimate strength was significantly affected by both the number of layers in the bearing and the building's design configuration, i.e., the building's height to width ratio. As either the layer number or the length ratio increases, the tensile/compressive stress applied on the bearings fluctuates, thus redusing the ultimate strength. It was additionally found that the rubber bearings break not only in the tensile and shear states, but also in the compression and shear states. This results because stress fluctuations are biased towards the compression direction when the rubber bearing vertical stiffness has deteriorated in the tensile region. When this condition is present, the building's base plain rotation center moves in the horizontal direction, and in some cases the tensile stress acts on more than half the bearings; thus the compressive stress applied on the compression-side bearing increases by 4.7 times that under normal load conditions.
社団法人日本機械学会の論文
1992-01-25