COMPARATIVE ANALYSIS OF STANDARDS FOR DETERMINING SEISMIC IMPACTS ON STRUCTURES AND THE POSSIBILITY OF CREATING A UNIFIED METHOD

Abstract

A brief analysis of different norms for determining seismic loads based on the spectral theory shows their generality and the presence of numerous corrections and clarifications in order to assess the true seismic effects. When calculating seismic loads according to the norms of different countries for the same conditions, there is a significant discrepancy between the results obtained. According to the authors, there is a real possibility of creating common international norms by refining and supplementing the existing ones. Apparently, the European norms EN 1998-2004/2012 are more promising. The principle of calculation according to EN looks more natural, because seismic actions are actually transmitted to structures through foundations. In addition, this approach makes it possible to take into account a number of factors that affect the degree of seismic impacts (ultimate resistance of soils to shear, pressure on foundation soils, area of contact between foundations and soil, angle of inclination of the seismic beam, etc.). An attempt is also made to assess the factors that limit the acceleration of building foundations during strong earthquakes.