1995 Fiscal Year Final Research Report Summary
Development of Mixed Finite Element Analysis Method for Laminated Rubber Bearing
| Project/Area Number |
06650085
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| Research Category |
Grant-in-Aid for General Scientific Research (C)
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| Allocation Type | Single-year Grants |
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| Research Field |
Materials/Mechanics of materials
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| Research Institution | University of Tsukuba |
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Principal Investigator |
WATANABE Osamu Institute of Engineering Mechanics, Univ.of Tsukuba, Assoc.Prof., 構造工学系, 助教授 (80111368)
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| Project Period (FY) |
1994 – 1995
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| Keywords | Laminated rubber bearing / Mixed method / Finite-element method / Structural analysis |
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| Research Abstract |
The laminated rubber bearing consisting fo rubber sheets and steel plates has been widely used in base structures to absorb earthquake vibration. The function of this bearing is to support all the weight of the structure and protect the structure from shear vibration by earthquake. Due to the nearly incompressible property of hyperelasticity, the displacement-based finite-element solutions cause large errors in pressure solutions. In order to overcome this shortcoming, a mixed method has been proposed, where pressure and displacement fields are developed as independent variables. Finite-element solutions depend upon shape function and the numerical integration technique ; however, the suitable numerical condition for a laminated rubber bearing has not been fully discussed. The present study shows the mixed finite-element formulation in rate form for hyperelasticity, and show numerical examples of the laminated rubber bearing system in shear deformation in 2-dimensional as well as 3-dimensional case to clarify the advantage of the analysis method and the fundamental feature of mechanical response.
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