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An evaluation of triple friction pendulum bearing for high-rise structure
This research addresses the topic of seismic isolation of high-rise structures by investigating the effects of triple friction pendulum (TFP) bearing on the seismic response of a 30-story steel moment frame building. Numerical analyses were conducted using an elastic stick model to represent the isolated substructure in Opensees and the following effects on the seismic performance of this high-rise model are evaluated: 1) the different isolated system using the TFP bearing and single friction pendulum (SFP) bearing which have similar force-displacement hysteretic curve 2) the change of friction coefficients of the TFP bearing. Time history analysis was conducted under three levels of earthquake events: 2% 50 years, 10% 50 years and 50% 30 years and each level contains a set of 20 ground motions. Different friction coefficients combinations for the TFP bearing isolated system investigated in this study are: 1% 2% 3%, 1% 4% 7% and 2% 4% 6% together with a SFP bearing isolated system having a friction coefficient 4% as comparison.The results from numerical analysis showed that there are significant advantages on the control of floor acceleration and inter-story drift as well as story shear force using TFP bearing isolated system comparing to the SFP bearing isolated system. Also, it indicated that smaller friction coefficients especially for the first friction coefficient of TFP bearing will lead to more desirable seismic performance. Significant tension can develop as a result of the overturning moment due to lateral force even when the ground motion dies out. Meanwhile, the study shows that the TFP bearing is much more effective on reduction of seismic response of high-rise structure during small earthquake scenario where the SPF bearing has little effect on the reduction of seismic response.
Author(s):
Benshun Shao
UC Berkeley Department of Civil and environmental engineering
United States
Mahin Steven
UC Berkeley Department of Civil and environmental engineering
United States