SEISMIC PERFORMANCE EVALUATION OF A BASE-ISOLATED BUILDING

The Lombok and Palu Earthquakes that have recently occurred in Indonesia caused significant damage. Earthquakes are closely related to damage, landslide, and the loss of life and economy. However, the causes of these things are not solely due to the earthquake itself. The cause loss of life and economy caused solely due to the collapse of buildings that built by humans during an earthquake. To reduce impact loss of life and economy, Performance Based Seismic Design (PBSD) using based isolator can be one of the solution. By using PBSD economic considerations the cost of repair after an earthquake can be predicted. In this study, modeling 12-storey reinforced concrete buildings located in Yogyakarta Indonesia stands on soft soil using base isolator High Damping Rubber type (HDR HH090X4S, thickness 20 cm product of Bridgestone). The average of non-linear dynamic time history analysis of seven ground motion respectively Denali earthquake 2002, Imperial Valley 1940, Kobe 1995, Loma Prieta 1989, Northridge 1994, San Fernando 1971, Superstition Hills 1987 was conducted. Seismic response modification coefficient R was taken respectively 2.5, 3.5, 5.5, and 8. From these coefficients, the performance of the building is obtained with R 2.5 and R 3.5 performance building in the category of immediate occupancy, R 5.5 and R 8 Category damage control. Thus the building with R 2.5 and R 3.5 according to FEMA 273 will produce a building with a repair cost of 25% and repair time only 1 day, so that after the earthquake the building can resume normal operation.