構造用接着剤を用いた高減衰ゴムダンパーの開発
縮小部材試験結果
高減衰ゴムは温度依存性が小さいことにメリットがあるが，鋼板と一体での製造・販売となり，ダンパーの適用形態が限られる。本研究では高減衰ゴムダンパーの適用形態の自由度向上を図ることを目的として構造用接着剤の利用を検討し，縮小部材試験によりダンパー及び接着剤の性能を確認した。面積を1/100とした縮小ダンパーを用いた場合，接着耐力はダンパー耐力を上回る結果となった。接着長の増大に応じて応力集中が懸念されたため，接着長をパラメータとした接着剤の破断試験を行った。高強度タイプの接着剤は端部にひずみが集中し，耐力が低下したが可撓性タイプの接着剤は材料の強い非線形性により一様なひずみとなり安定した性状を示すことを確認した。
キーワード：制振ダンパー，粘弾性ダンパー，高減衰ゴム，構造用接着剤，縮小部材試験，応力集中
＊１ 技術センター 都市基盤技術研究部 防災研究室
Development of High-Damping Rubber Damper Using Structural Adhesives
Small-scale Member Test Results
High-damping rubber has the advantage of being less temperature-dependent. However, it is manufactured and sold integrally with the steel plate, and the forms of application of the dampers are limited. In this study, the use of structural adhesives was examined for the purpose of improving the flexibility in the forms of application of high-damping rubber dampers, and the performance of the dampers and adhesives was confirmed by a small-scale member test. When a small-scale damper with an area scale factor of 1/100 was used, the adhesive strength exceeded the damper strength. Since stress concentrations are a concern when the adhesive length is long, tests to failure were conducted on the adhesive, using the adhesive length as a parameter. With high-strength adhesive, the strain was concentrated on the edges and the strength was reduced. However, it was confirmed that flexible type adhesive exhibits uniform strain and stable properties due to the non-linearity of the material.
Keywords: damper, viscoelastic damper, high damping rubber, structural adhesives, small-scale member test, stress concentration
*1 Disaster Prevention Research Section, Urban Engineering Research Department, Taisei Advanced Center of Technology