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Withdrawn - BB-SPEEDset: A Validated Dataset of Near-source Simulated Earthquake Ground Motions for Engineering Applications

Physics-based numerical simulations have progressed to the level of providing a realistic description of earthquake ground motions in the variety of site and source conditions controlling the hazard at the site. For this reason, 3D numerical simulations of ground motion are recognized as one of the most promising approaches to face the sparsity of records in near-source and complex geological conditions, that often prevents a proper definition of seismic input for earthquake engineering applications. Nevertheless, building confidence in the utilization of such simulations by the engineering community requires the availability of datasets of simulated accelerograms, which have undergone a comprehensive validation process, in a broad frequency range, from both seismological and engineering perspectives.

This contribution aims at presenting BB-SPEEDset, a validated dataset of near-source broadband accelerograms obtained by the computer code SPEED (http://speed.mox.polimi.it/) for several earthquakes in a wide range of magnitude (Mw=5.5.-7.4), faulting styles and geological contexts. To strengthen the engineering use of the simulated dataset, firstly, it is shown that the main features of near-source ground motion in BB-SPEEDset are in good agreement with those obtained from a near-source records dataset, within the same magnitude and distance range and in a broad range of frequencies. Secondly, it is proved that BB-SPEEDset accelerograms, when used to provide spectrum-compatible input motions for inelastic time-history analyses of Single-Degree-Of-Freedom structures, do not yield any systematic bias with respect to record-based structural analyses.

Presenting Author: Chiara Smerzini

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