EFFECTIVENESS OF DOUBLE FRICTION PENDULUM BEARING FOR SEISMICALLY ISOLATED BUILDINGS IN VIETNAM

Abstract

Double friction pendulum bearings (DFP bearings) are an improved form of single friction pendulum bearings (SFP bearings). A DFP bearing increases the displacement limit compared to an SFP bearing with the same size. This bearing type also allows different friction coefficient between contact
surfaces thus improves performance of isolated building. The purpose of this study is to evaluate the seismic effectiveness of DFP bearings for buildings in Vietnam. Analysis of a simplified two-dimensional (2D) model of a 5-storey building subjected to earthquakes in two cases: without and with DFP bearings is conducted. Ground motion data includes seven acceleration records selected and scaled to fit earthquake conditions in Vietnam. Two earthquake levels, including strong earthquake level with 10% probability of exceedance in 50 years and very strong earthquake level with 2% probability of exceedance in 50 years, were analyzed. The results show that DFP bearings are very effective in protecting the building under these earthquake levels.