THE EFFECT OF GEOMETRICAL NONLINEARITY ON THE BUCKLING LOAD OF LAMINATED RUBBER BEARINGS

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  • NISHIMURA Isao
    Dep. of Architecture, Faculty of Engineering, Musashi Institute of Technology

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  • 積層ゴム支承の座屈荷重に与える幾何学的非線形の影響
  • セキソウ ゴムシショウ ノ ザクツカジュウ ニ アタエル キカガクテキ ヒセンケイ ノ エイキョウ

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This paper evaluates the effect of geometrical nonlinearity on the buckling load of laminated rubber bearings. In the past research, the author proposed a nonlinear buckling model for shear-bending columns, which revealed the fact that the reduction of lateral stiffness of rubber bearings in a large horizontal displacement depends on their configuration. It has been believed that the low-rise elastomeric columns have a more stable load-displacement characteristics than slender ones. The model, however, clarified the risk of the unstable post-buckling behavior latent in the flat configuration of bearings. On the other hand, the slenderness of elastomeric columns plays an important role to maintain their load supporting capacity in a large deformed area. These analytical discoveries are numerically investigated and compared with some experimental observations.

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