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Earthquakes and Structures
  Volume 14, Number 6, June 2018, pages 505-523

Comparison of the seismic performance of existing RC buildings designed to different codes
Christos A. Zeris and Constantinos C. Repapis

Abstract     [Full Text]
    Static pushover analyses of typical existing reinforced concrete frames, designed according to the previous generations of design codes in Greece, have established these structures\' inelastic characteristics, namely overstrength, global ductility capacity and available behaviour factor q, under planar response. These were compared with the corresponding demands at the collapse limit state target performance point. The building stock considered accounted for the typical variability, among different generations of constructed buildings in Greece, in the form, the seismic design code in effect and the material characteristics. These static pushover analyses are extended, in the present study, in the time history domain. Consequently, the static analysis predictions are compared with Incremental Dynamic Analysis results herein, using a large number of spectrum compatible recorded base excitations of recent destructive earthquakes in Greece and abroad, following, for comparison, similar conventional limiting failure criteria as before. It is shown that the buildings constructed in the 70s exhibit the least desirable behaviour, followed by the buildings constructed in the 60s. As the seismic codes evolved, there is a notable improvement for buildings of the 80s, when the seismic code introduced end member confinement and the requirement for a joint capacity criterion. Finally, buildings of the 90s, designed to modern codes exhibit an exceptionally good performance, as expected by the compliance of this code to currently enforced seismic provisions worldwide.
Key Words
    existing RC buildings; seismic design code; comparative analysis; nonlinear dynamic analysis; performance evaluation; ductility; behaviour factor
Christos A. Zeris: Department of Civil Engineering, National Technical University of Athens, University Campus, Zografou 15780, Greece
Constantinos C. Repapis: Department of Civil Engineering, University of West Attica, 250 Thivon and Petrou Ralli Str., Egaleo 12244, Greece

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