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Earthquakes and Structures Volume 11, Number 1, July 2016, pages 25-43 DOI: http://dx.doi.org/10.12989/eas.2016.11.1.025 |
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Seismic response of spring-damper-rolling systems with concave friction distribution |
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Biao Wei, Peng Wang, Xuhui He and Lizhong Jiang
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| Abstract | ||
| The uneven distribution of rolling friction coefficient may lead to great uncertainty in the structural seismic isolation performance. This paper attempts to improve the isolation performance of a spring-damper-rolling isolation system by artificially making the uneven friction distribution to be concave. The rolling friction coefficient gradually increases when the isolator rolls away from the original position during an earthquake. After the spring-damper-rolling isolation system under different ground motions was calculated by a numerical analysis method, the system obtained more regular results than that of random uneven friction distributions. Results shows that the concave friction distribution can not only dissipate the earthquake energy, but also change the structural natural period. These functions improve the seismic isolation efficiency of the spring-damper-rolling isolation system in comparison with the random uneven distribution of rolling friction coefficient, and always lead to a relatively acceptable isolation state even if the actual earthquake significantly differs from the design earthquake. | ||
| Key Words | ||
| structure; isolation; concave friction distribution; spring; damper; seismic performance | ||
| Address | ||
| Biao Wei, Peng Wang, Xuhui He and Lizhong Jiang: School of Civil Engineering, Central South University, 22 Shaoshan South Road, Changsha, China Biao Wei, Peng Wang, Xuhui He and Lizhong Jiang: National Engineering Laboratory for High Speed Railway Construction, 22 Shaoshan South Road, Changsha, China | ||