期刊
INTERNATIONAL JOURNAL OF SOLIDS AND STRUCTURES
卷 46, 期 7-8, 页码 1778-1792出版社
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.ijsolstr.2009.01.005
关键词
High damping rubber bearing; Rheology model; Nonlinear viscosity; Overstress; Loading and unloading; Seismic response
类别
资金
- Japanese Ministry of Education, Science, Sports and Culture (MEXT)
The mechanical behavior of high damping rubber bearings (HDRBs) is investigated under horizontal cyclic shear deformation with a constant vertical compressive load. On the basis of experimental observations, an elasto-viscoplastic rheology model of HDRBs for seismic analysis is developed. In this model, the Maxwell model is extended by adding a nonlinear elastic spring and an elasto-plastic model (spring-slider) in parallel. In order to identify constitutive relations of each element in the rheology model, an experimental scheme comprised of three types of tests, namely a cyclic shear (CS) test, a multi-step relaxation (MSR) test, and a simple relaxation (SR) test, are carried out at room temperature. HDRB specimens with the standard ISO geometry and three different high damping rubber materials are employed in these tests. A nonlinear viscosity law of the dashpot in the Maxwell model is deduced from the experimental scheme, and incorporated into the rheology model to reproduce the nonlinear rate dependent behavior of HDRBs. Finally, numerical simulation results for sinusoicial loading are presented to illustrate capability of the proposed theology model in reproducing the mechanical behavior of HDRBs. (C) 2009 Elsevier Ltd. All rights reserved.
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