TY - JOUR
T1 - Three-Dimensional Base Isolation Using Vertical Negative Stiffness Devices
AU - Cimellaro, Gian Paolo
AU - Domaneschi, Marco
AU - Warn, Gordon
N1 - Funding Information:
This work was supported by the H2020 European Research Council: [Grant Number 637842]. The research leading to these results has received funding from the European Research Council under the Grant Agreement no. ERC_IDEAL RESCUE_637842 of the project IDEAL RESCUE-Integrated Design and Control of Sustainable Communities during Emergencies.
Publisher Copyright:
© 2018 Taylor & Francis Group, LLC.
PY - 2020/12/1
Y1 - 2020/12/1
N2 - A three-dimensional (3-D) base isolation system to control both the horizontal and vertical components of ground motion is presented in this paper. The system is adopting a negative stiffness device (NSD) that can be considered as an adaptive passive protection system, which can apparently change the stiffness of the structure. This work is focused on studying through numerical simulations the mitigation performance of the NSD against strong earthquakes in the vertical direction. The base isolation arrangement consists of elastomeric bearings acting both in the horizontal and vertical direction and NSDs acting only in the vertical direction. So, a 3-D base isolation is achieved, where it is assumed that the NSDs affect the vertical stiffness of the system only. Numerical analyses show that the presence of NSDs reduces the vertical acceleration in the structure. Nevertheless, accordingly with the passive control theory, the relative displacements increase. Therefore, it seems advisable a supplemental damping to mitigate this effect. Thanks to the presence of rubber isolators, it is possible to employ their inherent damping without introducing specific dampers in the vertical direction.
AB - A three-dimensional (3-D) base isolation system to control both the horizontal and vertical components of ground motion is presented in this paper. The system is adopting a negative stiffness device (NSD) that can be considered as an adaptive passive protection system, which can apparently change the stiffness of the structure. This work is focused on studying through numerical simulations the mitigation performance of the NSD against strong earthquakes in the vertical direction. The base isolation arrangement consists of elastomeric bearings acting both in the horizontal and vertical direction and NSDs acting only in the vertical direction. So, a 3-D base isolation is achieved, where it is assumed that the NSDs affect the vertical stiffness of the system only. Numerical analyses show that the presence of NSDs reduces the vertical acceleration in the structure. Nevertheless, accordingly with the passive control theory, the relative displacements increase. Therefore, it seems advisable a supplemental damping to mitigate this effect. Thanks to the presence of rubber isolators, it is possible to employ their inherent damping without introducing specific dampers in the vertical direction.
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U2 - 10.1080/13632469.2018.1493004
DO - 10.1080/13632469.2018.1493004
M3 - Article
AN - SCOPUS:85051808022
SN - 1363-2469
VL - 24
SP - 2004
EP - 2032
JO - Journal of Earthquake Engineering
JF - Journal of Earthquake Engineering
IS - 12
ER -