A Procedure for the Evaluation of Seismic Local Effects in Lombardia (Italy) for Urban Planning

Abstract eng:
In the paper the application of a methodology for the evaluation of local effects in Lombardia Region (Italy) is shown. The purpose was to develop a procedure that may be easily repeated, to take into account local effects in urban planning. The procedure provides three levels of widening: the 1° level, a qualitative analysis, gives the identification of the areas characterized by the local effects. The 2° level, through a semi-quantitative analysis, gives, when the geologic, geophysical and geotechnical characteristics of a site are known, the possible level of the expected amplifications, using the performed correlation curves. The 3° level, characterized by a quantitative analysis, necessary in the case in which the application of the 2° level shows the inadequacy of the seismic code, gives the response spectra applying during the project design phase. Particularly the steps performed to have the correlation curves, of the 2° level, are shown. A series of geologic, geomorphologic and geotechnical analyses have been carried out, to identify the areas affected by site effects and to characterize the lithotechnical units. The expected seismic inputs have been calculated and numerical analyses using one-dimensional code, analyzing single soil column, and two-dimensional codes, working with boundary elements on sections, have been done. The results, in terms of elastic pseudo-acceleration spectra and amplification coefficients, provide some correlations between the geometric and geotechnical characteristics of the sites and the values of the amplification coefficients.

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