Effect of ground motion selection on seismic response of buildings

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Thesis Type: Postgraduate

Institution Of The Thesis: Middle East Technical University, Faculty of Engineering, Department of Civil Engineering, Turkey

Approval Date: 2015

Thesis Language: English

Student: Özge Karakütük

Supervisor: AHMET YAKUT

Open Archive Collection: AVESIS Open Access Collection

Abstract:

In this study, effects of ground motion selection and scaling procedure given in different earthquake design codes were investigated. To observe differences between the scaling procedures defined in various seismic design codes, these procedures are applied employing the response spectra defined in these specifications. Four reinforced concrete moment resisting frame buildings were used in the analyses. These buildings have 3, 4, 6 and 8 stories. This way, effects of scaling on low-rise and mid-rise buildings were studied. Material properties, structural member dimensions and span lengths of buildings were selected by considering the properties of the constructed reinforced concrete buildings in Turkey. Reinforcement of these buildings were determined with respect to TS 500. Two dimensional finite element models of these buildings were developed and necessary information for scaling such as fundamental period was obtained. Then, ground motion sets were selected and scaled for each building and each spectrum according to each procedure employed. Scaling procedures used and compared in this study are based on TEC-07, ASCE/SEI 7-10 and Eurocode-8. According to these specifications both response spectrum and time history analyses of the structures were performed. The results of these analyses were used to evaluate the effect of ground motion scaling on seismic response of low- and mid-rise reinforced concrete moment resisting frame buildings. Due to the criteria on scaling of ground motion recordings in all earthquake design codes used in this research, time-history analyses yielded more conservative results than response spectrum analyses. Scaling according to TEC-07 or Eurocode-8 procedures gave closer results to response spectrum analyses as compared to scaling with respect to ASCE/SEI 7-10. The difference between time history analyses and response spectrum analyses diminishes as the number of story increases. In other words, as the fundamental period of the structure increases the results of response spectrum and time-history design procedures converge.