Akademik Veri Yönetim Sistemi
17th World Conference on Earthquake Engineering, Sendai, Japonya, 27 Eylül - 02 Ekim 2021, ss.1-9
Base isolation systems have been recently employed for structures as retrofitting strategies especially in seismologically active zones. For such base isolated systems, one challenging task is the investigation of seismic demand parameters under destructive earthquakes. Since the number of recorded ground motions corresponding to large intensities is limited, use of simulated records is an alternative option to overcome this issue. There are several ground motion simulation approaches with various levels of accuracy at different frequency bands. Before using simulations for analyses of base isolated structures, further research should be performed to check their efficiency in simulating alternative structural demand parameters compared to those assessed through the use of real ground motion records. In this work, a 6-story steel moment-resisting frame is selected from the SAC Steel Project as the case study building, and the frame is retrofitted with lead rubber bearings in accordance with ASCE 7‐10. Then, in order to check the efficiency of simulations from alternative ground motion simulation methods in estimating the structural demand parameters of the selected frame, nonlinear time history analysis is performed for the developed model of the case study building under the observed and simulated records of a past event. The past earthquake is selected as the 6 April 2009 L’Aquila (Italy) earthquake (Mw=6.3). The alternative ground motion simulation methods considered herein are the stochastic finite-fault method based on a dynamic frequency approach and the hybrid integral-composite technique. Comparison of the results from the observed and simulated ground motion record sets based on alternative simulation approaches is accomplished in terms of energy-based seismic engineering demand parameter which is the seismic input energy herein. The numerical results of this study demonstrate that differences in terms of the real and estimated energy-based engineering demand parameter vary depending on ground motion simulation approach.