積層ゴム支承の終局特性に関する実験及び解析的研究

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タイトル別名
  • EXPERIMENTAL AND ANALYTICAL STUDY ON ULTIMATE PROPERTY OF RUBBER BEARINGS
  • 積層ゴム支承の終局特性に関する実験及び解析的研究 : 高減衰ゴム系積層ゴム支承の終局特性予測のための材料モデル提案と破断及び座屈予測解析
  • セキソウ ゴムシショウ ノ シュウキョク トクセイ ニ カンスル ジッケン オヨビ カイセキテキ ケンキュウ : コウゲンスイ ゴムケイ セキソウ ゴムシショウ ノ シュウキョク トクセイ ヨソク ノ タメ ノ ザイリョウ モデル テイアン ト ハダンオヨビザクツヨソク カイセキ
  • Proposal of material model to predict ultimate property and prediction analysis of break and buckling property for high-damping rubber bearings
  • 高減衰ゴム系積層ゴム支承の終局特性予測のための材料モデル提案と破断及び座屈予測解析

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<p> Rubber bearing is one of measure isolation devices and there are many types of rubber bearing. For example, natural rubber bearings, lead rubber bearings, high-damping rubber bearings and elastomeric sliding bearings are major devices in Japan. Rubber bearings support upper structure under high vertical loading, therefore, it is very important to understand ultimate property and margin to the ultimate state to design seismically isolated structures properly. However, it is difficult to carry out ultimate property test using full-scale specimen because large scale testing machine is needed. One of the alternative method to predict performance of rubber bearings is analysis approach and finite element analysis is one of the most popular methods. Therefore authors propose analysis model to predict ultimate property of rubber bearings based on finite element analysis. In this study, proposed method is mainly focused on high-damping rubber bearings. One of the important feature of high-damping rubber bearings is that the high-damping rubber has the functions of both damping and restoring force. First, new material model for high-damping rubber bearing to predict ultimate property and ultimate property prediction method are proposed. Second, analytical example to predict second shape factor dependence of ultimate property is introduced.</p><p> Regarding rubber bearings there are various modes of ultimate state such as break under large horizontal deformation (horizontal break), break under large tensile deformation (tensile break), break under large vertical compression, buckling and roll-out. In this study, ultimate property prediction method using is proposed focusing on three ultimate modes of horizontal break, tensile break and buckling. In the case of finite element analysis, it is very important to selection material model for rubber properly. Regarding high-damping rubber bearing, however, there was no proper material model to predict ultimate property mentioned above. Therefore, new material model for high-damping rubber bearing to predict ultimate property is proposed in this paper. By comparing analysis and experiment result, validity of proposed material model for high-damping rubber bearing is shown.</p><p> In the past, as for lead rubber bearings, authors showed the various factor dependence of ultimate property. The factors are number of lead plugs, diameter of lead plug, insert plate thickness, shear modulus variability of rubber and break strain variability of rubber. In this study, authors show second shape factor (S2) dependence of ultimate property. As a result of proposed analysis, obtained main findings are as follows;</p><p> A. Under tensile loading, as second shape factor S2 is smaller, tensile break strain is decrease.</p><p> B. Under horizontal loading, as second shape factor is small, buckling mode tends to be dominant. And as second shape factor is large, break mode tends to be dominant</p><p> Findings B is obvious conclusions, however, the tendencies were predicted by finite element analysis using proposed method in this study.</p>

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