A STUDY TO FIND THE MOST SIMILAR REAL EARTHQUAKE RESPONSE SPECTRUM TO THE RESPONSE SPECTRUM DEVELOPED FROM BNBC 2006 NORMALIZED RESPONSE SPECTRUM

Abstract

Earthquake is a natural phenomenon which has an adverse effect on human lives and natural resources. It is now a growing concern of our structural engineer to design an earthquake resisting structure. In this study, the comparison has been made between earthquake response spectra with our national building code provided response spectra. BNBC 2006 has provided us with a normalized response spectrum for 5% damping ratio. This is used in this study to develop a response spectrum for rock and stiff soil (soil type S1) and earthquake zone 2. With the help of Pacific Earthquake Engineering Research Centre (PEER) we have selected 5 earthquake response spectra named Friuli earthquake Italy, Gazli earthquake Uzbekistan, Imperial Valley 2 earthquake USA, Imperial Valley 6 earthquake USA, and Tabas earthquake Iran for the comparison. The analysis has been done by using SAP2000 on a steel structure. With some modification, the model structure has been developed from Federal Emergency Management Agency (FEMA) 355C report Appendix B which is a 9 storied building, square in plan and with 5 bays in each direction with one underground basement. The structural response like base reaction, joint reaction, and joint displacement has been considered for the comparison. Finally, it is found out that the response spectrum for earthquake Gazli of Uzbekistan which is a magnitude of 7.0 provides response close to BNBC response spectrum for soil type S1.