Accuracy of Seismic Treatments Assessments Using Source Models

Abstract eng:
Today are a lot of publications devoted to seismic treatments assessments using the dislocation model of source. Sometimes the synthetic accelerograms calculated using this method even proposed to structure engineers for antiseismic design. The response spectrum of calculated accelerogram is accepted as a local (site - specific) design spectrum. Our investigation is dedicated to the estimating of accuracy of results obtained by such methods. The calculations are based on the model of the type of Haskell's solution, generalized to the case of the semi - infinite media. The near-field ground motion at the given site is computed using developed model of particular earthquake. Then a site -specific response spectrum related to obtained synthetic accelerogram is calculated. It is possible calculate the synthetic accelerograms and related response spectra using variability of the parameters of source model according to probability of source parameters realization. The influence of variability of source model parameters on the parameters of seismic treatments is considered. Independently (as it is accepted in the classic practice of seismic treatment assessment) the local (site - specific) design spectrum is constructed using the empirical data. The dispersion of strong ground motion parameters is known. Finally by comparison of the parameters of strong ground motion obtained using source model and the empirical ones it is considered the problem of the limits of application to use the discussing method in earthquake engineering.

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