Abstract
The earthquake (EQ) frequency content can be high, moderate or low frequency, mainly depends on epicenter’s distance and local soil conditions. The EQ frequency content will affect on the inelastic response of building structures. According to Vision 2000 and FEMA 356 under particular hazard level, the building is expected to perform structural response either fully operational, immediate occupancy, life safety or near collapse. Numerical investigation of 10-stories mid-rise reinforced concrete frame structure subjected to variations of the earthquake frequency contents has been conducted. The building model is assumed to be located at Yogyakarta on the soft soil condition. The building model it was shaken by various EQ frequency contents and maximum ground accelerations (PGA) until approaching the global drift ratio (GDR) of 0.50, 0.75, 1.00, 1.25, 1.50, 1.75 and 2.00 %. Result of investigation show that the EQ high frequency is almost impossible to cause GDR ± 2.0% since it needs PGA as high as 4.01g. Under the possible maximum recorded PGA in the field, the only EQ with low frequency content which has capacity to cause maximum GDR reaches ± 2.0%. or at maximum of structural performance level. Between GDR and overall damage index (ODI) is linearly correlated, however boundaries of the performance levels according to GDR and ODI does not meet at the same point.
Highlights
The design of earthquake (EQ) resistant structures has undergone evolution from traditional forced based seismic design (FBSD) to so called performance based on seismic design (PBSD)
The evolution of the design method is due to the fact that there is an increased risk to be retained by the public after several major earthquakes occurred since the 1990’s [1]
In contrast to previous studies, this study has identified the EQ with high frequency (HF), moderate frequency (MF) and low frequency (LF) content in relation to its capacity to cause/resulting global drift ratio (GDR) according to performance levels in the PBSD by using inelastic time history analysis
Summary
The design of earthquake (EQ) resistant structures has undergone evolution from traditional forced based seismic design (FBSD) to so called performance based on seismic design (PBSD). The previous method i.e. FBSD has already successfully protected the fatalities under earthquake but the cost of repairing the structure were unexpectedly high This is because in the FBSD the main objective of the method is to provide required strength and ductility under particular level of seismic hazard to provide for life safety only. It should be given an alternative in the selection of a design method that gives better protection life safety and loss of wealth. In contrast to previous studies, this study has identified the EQ with high frequency (HF), moderate frequency (MF) and low frequency (LF) content in relation to its capacity to cause/resulting global drift ratio (GDR) according to performance levels in the PBSD by using inelastic time history analysis. 3-scenarios have been used: 1) structural response due to high, moderate and low frequency content with same GDR to be compared, 2) the structure response due to the same PGA at EQ high, moderate and low frequency are compared and 3 ) plotting between GDR and ODI that includes performance levels
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