Influence of Near-Fault Ground Motions with Fling-Step and Forward-Directivity Characteristics on Seismic Response of Base-Isolated Buildings

• Published in: Journal of earthquake engineering : JEE Vol. 25; no. 3; pp. 455 - 474
• Main Authors: Bhagat, Satish, Wijeyewickrema, Anil C., Subedi, Naresh
• Format: Journal Article
• Language: English
• Published: Abingdon Taylor & Francis 23.02.2021; Taylor & Francis Ltd
• Subjects: Artificial Pulses; Base-Isolated Buildings; Buildings; Directivity; Finite element method; Fling-Step; Forward-Directivity; Ground motion; Mathematical models; Near-Fault Ground Motions; Nonlinear analysis; Nonlinear response; Pulse Period; Seismic isolation; Seismic response; Shear walls; Superstructures; Three dimensional models
• ISSN: 1363-2469; 1559-808X
• DOI: 10.1080/13632469.2018.1520759

The behavior of base-isolated buildings under near-fault (NF) ground motions with fling-step and forward-directivity characteristics is investigated using three-dimensional nonlinear finite element models. Nonlinear response history analysis (NLRHA) is also carried out after removing the dominant pulse from the NF ground motion records. The results obtained for 10-story base-isolated buildings with and without shear walls, indicate that NF ground motions with fling-step and forward-directivity characteristics produce large inter-story drift ratios and floor accelerations, compared to the case when the dominant pulse is removed. Additional NLRHA carried out using artificial pulses shows that the isolator and superstructure responses are larger for pulses with fling-step characteristics, compared to pulses with forward-directivity characteristics.