Version 1
: Received: 1 September 2022 / Approved: 2 September 2022 / Online: 2 September 2022 (03:10:50 CEST)
Version 2
: Received: 28 September 2022 / Approved: 29 September 2022 / Online: 29 September 2022 (03:20:20 CEST)
Fujii, K. Influence of the Angle of Seismic Incidence of Long-Period Pulse-like Ground Motion on an Irregular Base-Isolated Building. Frontiers in Built Environment 2022, 8, doi:10.3389/fbuil.2022.1034166.
Fujii, K. Influence of the Angle of Seismic Incidence of Long-Period Pulse-like Ground Motion on an Irregular Base-Isolated Building. Frontiers in Built Environment 2022, 8, doi:10.3389/fbuil.2022.1034166.
Fujii, K. Influence of the Angle of Seismic Incidence of Long-Period Pulse-like Ground Motion on an Irregular Base-Isolated Building. Frontiers in Built Environment 2022, 8, doi:10.3389/fbuil.2022.1034166.
Fujii, K. Influence of the Angle of Seismic Incidence of Long-Period Pulse-like Ground Motion on an Irregular Base-Isolated Building. Frontiers in Built Environment 2022, 8, doi:10.3389/fbuil.2022.1034166.
Abstract
In general, isolators and dampers used in seismically isolated buildings are designed to be isotropic in any horizontal direction. However, in the case of buildings with plan irregularities, their nonlinear responses depend on the direction of seismic loading. To discuss the influence of the angle of seismic incidence (ASI) on the nonlinear response of irregular building structures, it is important to define the angle of the critical axis of the horizontal ground motion. One possible choice is the “principal axis of ground motion” proposed by Arias (1970). However, because this principal axis is independent of the natural period of a structure, it could be complicated to use for seismically isolated structures with long natural periods. In this study, the influence of the ASI of long-period pulse-like seismic input on an irregular base-isolated building is investigated. First, the angle of the principal axis of ground motion is defined in terms of the cumulative energy input. Then, a nonlinear time-history analysis of a five-story irregular base-isolated building is performed using 10 long-period pulse-like ground motion records considering various ASIs. The results show that, compared with the principal axis of ground motion proposed by Arias, defining the principal axis of ground motion in terms of the cumulative energy input is more suitable for discussions concerning the influence of the ASI on the response of an irregular base-isolated building.
Keywords
base-isolated building, irregularity, angle of seismic incidence, pulse-like ground motion, energy input
Subject
Engineering, Civil Engineering
Copyright:
This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.
Commenter: Kenji Fujii
Commenter's Conflict of Interests: Author