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Earthquakes and Structures Volume 17, Number 2, August 2019 , pages 191-204 DOI: https://doi.org/10.12989/eas.2019.17.2.191 |
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Effectiveness of non-linear fluid viscous dampers in seismically isolated buildings |
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Elif Guler and Cenk Alhan
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| Abstract | ||
| Near-field earthquake records including long-period high-amplitude velocity pulses can cause large isolation system displacements leading to buckling or rupture of isolators. In such cases, providing supplemental damping in the isolation system has been proposed as a solution. However, it is known that linear viscous dampers can reduce base displacements in case of near-field earthquakes but at the potential expense of increased superstructure response in case of far-field earthquakes. But can non-linear dampers with different levels of non-linearity offer a superior seismic performance? In order to answer this question, the effectiveness of non-linear viscous dampers in reducing isolator displacements and its effects on the superstructure response are investigated. A comparison with linear viscous dampers via time history analysis is done using a base-isolated benchmark building model under historical near-field and far-field earthquake records for a wide range of different levels of non-linearity and supplemental damping. The results show that the non-linearity level and the amount of supplemental damping play important roles in reducing base displacements effectively. Although use of non-linear supplemental dampers may cause superstructure response amplification in case of far-field earthquakes, this negative effect may be avoided or even reduced by using appropriate combinations of non-linearity level and supplemental damping. | ||
| Key Words | ||
| seismic isolation; non-linear supplemental dampers; viscous dampers; near-field earthquakes | ||
| Address | ||
| Elif Guler and Cenk Alhan: Department of Civil Engineering, Istanbul University-Cerrahpasa, 34320 Avcilar, Istanbul, Turkey | ||