Seismic Performance Comparison of Fixed Base and Isolated Base Steel Multi-Storey Building

Nwe Nwe Win, Zaw Min Htun

Abstract


This study presents the comparative study on seismic performance of with and without isolation in eight-storeyed hypothetic steel building located in Mandalay. The base isolation system that is utilized lead rubber bearing which made with Japan rubber and Myanmar rubbers (RSS-1 and RSS-3). In this study, base isolation devices are installed under each column between the building and the supporting foundation to support the building and to minimize the damage due to earthquake. In this study, comparative advantages for using lead rubber bearing isolation systems with various types of rubber are mainly investigated by performing response spectrum and nonlinear time history analyses. The comparison process has been carried out on performance of the structure with storey displacement, storey acceleration, and storey drift. In the analysis phase, nonlinear time history analyses at DBE and MCE levels are conducted in ETABS to obtain the related floor accelerations, interstorey drifts and storey displacement. In performance assessment phase, probable damage cost, repair time and rate of injuries are computed using fragility curves and FEMA P-58 methodology in Performance Assessment Calculation Tool (PACT). Damage cost, repair time and rate of injuries are computed for each building at seismic demand level and the results are compared. According to investigation conducted, it can be inferred that RSS-3 is more effective than RSS-1 at DBE while RSS-1 is better than RSS-3 at MCE levels.


Keywords


lead rubber bearing; Japan rubber; Myanmar rubber; response spectrum and nonlinear time history analyses; ETABS; FEMA P-58; PACT.

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