caa a22 4500 467951195 CHVBK 20180405193742.0 cr unu---uuuuu 170328e20050301xx s 000 0 eng 10.1007/BF02637038 doi (NATIONALLICENCE)springer-10.1007/BF02637038 (NATIONALLICENCE)springer-10.1007/s00419-004-0361-6 Seismic base isolation by nonlinear mode localization [Elektronische Daten] [Y. Wang, D. McFarland, A. Vakakis, L. Bergman] Summary: In this paper, the performance of a nonlinear base-isolation system, comprised of a nonlinearly sprung subfoundation tuned in a 1∶1 internal resonance to a flexible mode of the linear primary structure to be isolated, is examined. The application of nonlinear localization to seismic isolation distinguishes this study from other base-isolation studies in the literature. Under the condition of third-order smooth stiffness nonlinearity, it is shown that a localized nonlinear normal mode (NNM) is induced in the system, which confines energy to the subfoundation and away from the primary or main structure. This is followed by a numerical analysis wherein the smooth nonlinearity is replaced by clearance nonlinearity, and the system is excited by ground motions representing near-field seismic events. The performance of the nonlinear system is compared with that of the corresponding linear system through simulation, and the sensitivity of the isolation system to several design parameters is analyzed. These simulations confirm the existence of the localized NNM, and show that the introduction of simple clearance nonlinearity significantly reduces the seismic energy transmitted to the main structure, resulting in significant attenuation in the response. Springer-Verlag, 2005 Nonlinear localization nationallicence Nonlinear normal modes nationallicence Base isolation nationallicence Wang Y. Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL, USA aut McFarland D. Department of Aerospace Engineering, University of Illinois, Urbana, IL, USA aut Vakakis A. Division of Mechanics, National Technical University of Athens, Greece aut Bergman L. Department of Aerospace Engineering, University of Illinois, Urbana, IL, USA aut Archive of Applied Mechanics Springer-Verlag 74/5-6(2005-03-01), 387-414 0939-1533 74:5-6<387 2005 74 419 https://doi.org/10.1007/BF02637038 text/html Onlinezugriff via DOI 1 research-article jats NATIONALLICENCE 856 40 https://doi.org/10.1007/BF02637038 text/html Onlinezugriff via DOI NATIONALLICENCE 700 1- McFarland D. Department of Aerospace Engineering, University of Illinois, Urbana, IL, USA aut NATIONALLICENCE 700 1- Vakakis A. Division of Mechanics, National Technical University of Athens, Greece aut NATIONALLICENCE 700 1- Bergman L. Department of Aerospace Engineering, University of Illinois, Urbana, IL, USA aut NATIONALLICENCE 700 1- Wang Y. Department of Civil and Environmental Engineering, University of Illinois, Urbana, IL, USA aut NATIONALLICENCE 773 0- Archive of Applied Mechanics Springer-Verlag 74/5-6(2005-03-01), 387-414 0939-1533 74:5-6<387 2005 74 419 NATIONALLICENCE 700 1- McFarland D. M. Department of Aerospace Engineering, University of Illinois, Urbana, IL, USA aut NATIONALLICENCE 700 1- Vakakis A. F. Division of Mechanics, National Technical University of Athens, Greece aut NATIONALLICENCE 700 1- Bergman L. A. Department of Mechanical and Industrial Engineering (adjunct), University of Illinois, Urbana, IL, USA aut NATIONALLICENCE 856 40 https://doi.org/10.1007/s00419-004-0361-6 text/html Onlinezugriff via DOI Metadata rights reserved Springer special CC-BY-NC licence nationallicence BK010053 XK010053 XK010000 NATIONALLICENCE NATIONALLICENCE NL-springer NATIONALLICENCE NATIONALLICENCE NL-springer