Mechanical properties of isolation bearings identified by a viscoelastic model |
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| Institution: | 1. Civil Engineering, University of Missouri, Columbia, MO, USA;2. Structural Engineering, AFCEC/COSC, Tyndall AFB, FL, USA;1. Department of Civil Engineering, Urmia University, Urmia, Iran;2. School of Civil Engineering, University of Tehran, Tehran, Iran;3. Department of Civil and Environmental Engineering, Incheon National University, 12-1 Songdo-dong, Yeonsu-gu, Incheon 22012, South Korea;4. Head of Center, Incheon Disaster Prevention Research Center, Incheon National University, 12-1 Songdo-dong, Yeonsu-gu, Incheon 406-840, South Korea;1. Department of Civil and Natural Resources Engineering, University of Canterbury, Christchurch, New Zealand;2. Department of Electronic and Computer Engineering, the Hong Kong University of Science and Technology, 999077, Hong Kong, China;3. Institute for Advanced Study, the Hong Kong University of Science and Technology, 999077, Hong Kong, China;1. School of Mathematical Sciences, University of Chinese Academy of Sciences, Beijing 100049, China;2. School of Mathematics Sciences, Nanjing Normal University, Nanjing 210023, China;3. Institute of Mathematics, Nanjing Normal University, Nanjing 210023, China;4. School of Mathematical Sciences, University of Science and Technology of China, Hefei, 230026, Anhui province, China;5. Wu Wen-Tsun Key Laboratory of Mathematics, USTC, Chinese Academy of Sciences, Hefei, 230026, Anhui, China |
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| Abstract: | The Haringx theory is usually employed to describe the mechanical behavior of rubber bearings subjected to a compressive axial load and a lateral shear deformation, but it does not consider the damping effect. In order to study the behavior of isolation bearings which possess an energy-dissipation capacity, the explicit formulas for the horizontal stiffness of viscoelastic columns and the corresponded height reduction are derived by the method of variable separation. These explicit formulas are then applied to develop an identification procedure to find the shear modulus and loss factor of the rubber using the cyclic shear tests of isolation bearings. Through this identification procedure, the empirical formulas for the shear modulus and the loss factor of rubber are established as functions of the strain amplitude and the excitation frequency. |
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