Assessment of the seismic non-linear behavior of ductile wall structures due to synthetic earthquakes |
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| Authors: | Philippe Schwab Pierino Lestuzzi |
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| Institution: | (1) IS-Structural Engineering Institute, EPFL-Ecole Polytechnique Fédérale de Lausanne EPFL ENAC IS IMAC, Batiment GC, Station 18, 1015 Lausanne, Switzerland |
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| Abstract: | In this paper, different methods for generating synthetic earthquakes are compared in terms of related non-linear seismic
response of ductile structures. The objective of the investigation is to formulate recommendations for the use of synthetic
earthquakes for reliable seismic analysis. The comparison is focused on the accuracy of the reproduction of the characteristics
of the structural non-linear response due to recorded earthquakes. First the investigations are carried out for non-linear
single-degree-of-freedom systems. Later, the results are validated for a set of realistic buildings modelled as multi-degree-of-freedom
systems. Various options of the classical stationary simulation procedure of SIMQKE and a non-stationary simulation procedure
proposed by Sabetta and Pugliese are examined and compared. The adopted methodology uses a set of recorded earthquakes as
a reference. Hundred synthetic accelerograms are generated for each examined simulation option with the condition that the
related elastic responses are similar to those of the reference set. The non-linear single-degree-of-freedom systems are defined
using six recognized hysteretic models and four levels of increasing non-linearity. The non-linear responses computed for
the reference set and the studied simulation options are then statistically compared in terms of displacement ductility and
energy. The results show that the implementation of the classical stationary procedure always leads to a significant underestimation
of the ductility demand and a significant overestimation of the energy demand. By contrast, non-stationary time histories
produce much better results. The results with the multi-degree-of-freedom systems are shown to confirm these conclusions. |
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| Keywords: | Ductility demand Hysteretic energy Non-linear structural response Non-stationary simulation Recorded earthquake Seismic analysis Stationary simulation Synthetic earthquake |
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