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.
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