Seismic Response Mitigation of Base-Isolated Buildings

authored by

Mohammad Hamayoun Stanikzai, Said Elias, Rajesh Rupakhety

Abstract

Earthquake response mitigation of a base-isolated (BI) building equipped with (i) a single tuned mass damper at the top of the building, (ii) multiple tuned mass dampers (MTMDs) at the top of the building, and (iii) MTMDs distributed on different floors of the building (d-MTMDs) is studied. The shear-type buildings are modeled by considering only one lateral degree of freedom (DOF) at the floor level. Numerical approach of Newmark's integration is adopted for solving the coupled, governing differential equations of motion of 5-and 10-story BI buildings with and without TMD schemes. A set of 40 earthquake ground motions, scaled 80 times to get 3200 ground motions, is used to develop simplified fragility curves in terms of the isolator maximum displacement. Incremental dynamic analysis (IDA) is used to develop simplified fragility curves for the maximum target isolator displacement. It is found that TMDs are efficient in reducing the bearing displacement, top floor acceleration, and base shear of the BI buildings. In addition, it was noticed that TMDs are efficient in reducing the probability of failure of BI building. Further, it is found that the MTMDs placed at the top floor and d-MTMDs on different floors of BI buildings are more efficient in decreasing the probability of failure of the BI building when compared with STMD.

External Organisation(s)

Old Dominion University
University of Iceland

Type

Article

Journal

Applied Sciences

Volume

10

ISSN

2076-3417

Publication date

12.02.2020

Publication status

Published

Peer reviewed

Yes

ASJC Scopus subject areas

General Engineering, Instrumentation, General Materials Science, Fluid Flow and Transfer Processes, Process Chemistry and Technology, Computer Science Applications

Electronic version(s)

https://doi.org/10.3390/app10041230 (Access: Open)