GNGTS 2014 - Atti del 33° Convegno Nazionale

translational directions are shown in Fig. 3. In order to conform with most similar relationships obtained for different cities and countries in the world, a power law was used for the calculated regression of data. The best-fitting relationships together with their R 2 values are shown on the graphs.The regression wascarried out separately for both (longitudinal and transverse) vibration directions. As a first observation, it is evident that the relationships are markedly different from those provided by the Eurocode 8 (CEN, 2003) and Goel and Chopra (1997) for the US. However, the experimental results obtained are in very good agreement with the others. Fig. 3 – a) Experimental period – height relationship in the longitudinal direction (longest side) of the Maltese buildings studied, in relation to other similar relationships by several authors. b) Same as (a) but in the transverse direction (shortest side). 392 GNGTS 2014 S essione 2.3