Bidirectional Simulation and Experiment on Friction Pendulum Isolation System and Research on Ratio between Bidirectional and Unidirectional Peak Responses
Date Issued
2016
Date
2016
Author(s)
Tsai, Yi-Yo
Abstract
Seismic isolation is an effective way to reduce seismic force which transmits to superstructure. The most common sliding isolation system is friction pendulum system which (FPS). In isolation system previous research, unidirectional isolation behavior is more thorough than bidirectional isolation behavior. Therefore, we introduce bidirectional isolation simulation of FPS and combine two friction coefficient model. Base on shaking table experiment data, we check the assumption of bidirectional isolation simulation and accuracy of it. We also compare two friction coefficient model and offer some suggestions on them. By using unidirectional and bidirectional simulation, we plot figures of seven dimensionless parameters and normalized peak ground acceleration (PGA) relation respectively under six different earthquake record. Observe ratio between bidirectional and unidirectional peak responses and bidirectional isolation behavior. In ratio between bidirectional and unidirectional peak responses, we give conservative range of displacement and acceleration. Engineers can not only use the ratio to check their analysis but also utilize in static analysis. In bidirectional isolation behavior, we use input as sine waves that phase between two orthogonal direction is different and earthquake record. to analysis. The sine waves analysis results indicate energy dissipation in leading phase direction is better. According to earthquake record analysis, we determine determine one fourth of isolation period as threshold. If time interval between two orthogonal direction’s PGA arrived less than the threshold, the two orthogonal direction’s PGA arrived regard as at the same time. Base on shaking table experiment’s results, threre are good accuracy of the dimensionless parameter in acceleration. According to bidirectional experiment’s results, we can find out that isolation displacement and structural acceleration are smaller in direction which PGA happen first then the other direction and isolation effect of isolation building is worse when two orthogonal direction’s PGA arrived regard as at the same time of earthquake.
Subjects
friction pendulum system
bidirectional isolation experiment
bidirectional isolation simulation and behavior
ratio between bidirectional and unidirectional peak responses
friction coefficient model
Type
thesis
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