繰返し作用による剛性低下と地震応答性状

概要

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Recent researchers have pointed out that the structural stiffness would be gradually reduced under the alternation of cyclic loadings in the ultimate region. This phenomenon is called the stiffness degradation or the deterioration of the restoring force characteristics. Such phenomenon could be observed not only on the steel frames with the diagonal bracings having buckled, but also on the reinforced concrete structures. The latter would show more remarkably this stiffness degrading phenomenon caused by the brittleness of concrete material. This paper will describe the deterioration effects of restoring force characteristics of reinforced concrete structures refering to the test results obtained by the author in the recent experimental studies and the stiffness degrading effects on the earthquake responses of one mass nonlinear hysteretic systems will be examined.
1974-12-01