旧耐震基準で設計されたRC造骨組のエネルギー吸収部材による地震時応答低減効果に関する実大部分モデル振動台実験

Abstract

Many existing buildings in Japan fail to meet the latest standards for earthquake resistance. For such structures, improved earthquake resistance has become an urgent issue, particularly since the Kobe Earthquake of January 17, 1995. There are two approaches to improving the earthquake resistance of such buildings. One is to increase shear force capacity. It is often conducted and the effects can be correctly estimated. A second is to install energy-absorbing devices. The primary purpose of this study was to confirm, through shaking table tests, the effects of installing energy-absorbing devices to a model structure corresponding to existing reinforced concrete buildings that fail to meet the latest earthquake resistance standards. The design of the model building was based on building codes in place before 1971. Three energy-absorbing devices were used in the shaking table tests: an elastic-plaster damper, an elastic-viscous damper, and a viscous damper with plastic characteristics. In the test, the energy-absorbing devices not only demonstrated energy-absorbing effects, they also boosted shear force capacity, preventing structural collapse. The results also confirmed that the test results can be accurately modeled by a response simulation model.