Akademik Veri Yönetim Sistemi
Journal of the Faculty of Engineering and Architecture of Gazi University, cilt.39, sa.1, ss.243-259, 2023 (SCI-Expanded, Scopus, TRDizin)
In this study, nonlinear time history analyses of a four-story seismically isolated building are performed under the effect of historical near-fault earthquake records and their artificially produced pulse counterparts. Comparing the structural responses obtained, the effectiveness of pulse models in predicting the seismic behavior of isolated buildings exhibiting lead core heating under the effect of near-fault earthquakes is examined. Figure A illustrates the methodology of the study (Figure Presented). Purpose: The aim of this study is to investigate the success of pulse models in determining the seismic response of isolated buildings exhibiting lead core heating under the effect of near-fault earthquakes. Theory and Methods: A four-story benchmark building seismically isolated with lead rubber bearings (LRBs) is modelled in OpenSees program. LRBs are represented by a deteriorating force-displacement curve to consider the strength degradation due to lead core heating. Nonlinear time history analyses are performed under historical near-fault earthquakes and their puls counterparts synthetically generated by He and Agrawal (2008), Makris Type-A and Makris Type-B (1997) pulse models. The structural responses such as bearing displacement, floor acceleration, characteristic strength and temperature rise are comparatively evaluated. Results: General structural behavior can be determined with synthetic pulse models but there are remarkable differences in structural response values depending on lead core heating. If lead core heating is neglected, the percentages of differences between the responses obtained with the original records and their synthetic counterparts are generally underestimated. Conclusion: Since the pulse models cannot fully capture the peak responses and do not consider the earthquake motion outside the main pulse, it is determined that using historical earthquake records would be appropriate in the analyses of seismically isolated structures that have strategic importance and contain vibration sensitive equipment, especially in cases where lead core heating is important.