Other parameters can also be used based on intensity measures, such as the peak ground acceleration, pga, the spectral acceleration at the fundamental period of the structure S a( T 1). The selection of earthquake records on most of seismic design codes are based on parameters obtained by disaggregated seismic hazard maps at a specific site, such as the magnitude, M, and the source-to-site distance, R, but other parameters can also be used, such as the soil type, the source mechanism, and the duration. In fact, among all possible sources of uncertainty (e.g., structural material properties, modeling approximations, design and analysis assumptions, etc.), the selection of earthquake ground motion has the highest effect on the variability of the structural response ( Padgett and Desroches, 2007). All these methods need as prerequisite the selection of a proper suite of earthquake ground motions to be reliable. Nowadays, the state-of-practice in earthquake engineering design has progressively moved toward the use of dynamic non-linear time history analysis with respect to response spectrum analysis, because of the exponential increment of computational power. The computer-based platform OPENSIGNAL is freely available for the general public at. The proposed computer-based platform combines in unified environment different features, such as (i) selection of ground motion records using both spectral and waveform matching, (ii) signal processing, (iii) response spectra analysis, and (iv) soil response analysis. The computer-based platform based on signal processing has been developed using a modular programing approach, to enable the selection and the processing of earthquake ground motion records. In addition, another originality of the proposed system architecture consists in the evaluation of the conditional mean spectrum on the entire Italian territory automatically, knowing the geographical coordinates. So, the hysteretic behavior of the soil is described using the shear modulus degradation and damping ratio curves. The soil behavior is modeled assuming that both the shear modulus and the damping ratio vary with the shear strain amplitude. 2Department of Structural, Geotechnical and Building Engineering (DISEG), Politecnico di Torino, Turin, ItalyĪ new computer-based platform has been proposed whose novelty consists in modeling the local site effects of the ground motion propagation using a hybrid approach based on an equivalent linear model.1Department of Civil and Environmental Engineering, University of California Berkeley, Berkeley, CA, USA.Gian Paolo Cimellaro 1,2* and Sebastiano Marasco 2
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