## 4 Calibrated Experimental Model for the Evaluation of Ground Motion Parameters  
Accordingly, since earthquake scenarios have been developed for the areas of Zagreb and Dubrovnik, where a large number of buildings were not constructed according to the standards requiring the mandatory application of seismic regulations for defining structural behavior during earthquakes, a structure representing the group of \"existing buildings\" was chosen. The ICONS experimental model shown in Figure 7[35], is a four-story reinforced concrete frame representing a non-seismically designed structure dimensioned for vertical loads without the application of seismic regulations, which was the practice in construction about 40 years ago across Europe. The ICONS model was designed by the LNEC (National Laboratory for Civil Engineering) in Lisbon, Portugal, and then constructed at full scale and tested for medium-strength earthquakes at the ELSA (European Laboratory for Structural Assessment) in Ispra, Italy, with the aim of assessing the seismic vulnerability of the frame. The model was subjected to an earthquake with a peak ground acceleration of 0.22 g with a return period of 475 years. All in-depth data about the model are available in [35]. The numerical model for analysis is made in Seismostruct [36]. The elements of the RC frame were modeled as force-based (FB) elements with plastic hinges at the ends of the elements, whose lengths amounted to 12.5% of the column and 16.4% of the beam length of the element. Longitudinal reinforcement was specified for each of the elements according to the experimental description [36]. For the material characteristics of the concrete, [PERSON]'s model [37] was applied, which took into account the confinement of the concrete with a confinement factor of 1.2; the Menegotto-Pinto model [38] was utilized for the nonlinear model of reinforcing steel with values according to [35]. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline  & **PGA** & **PGV** & **PGD** & **SED** & **ASI** & **HI** & **Ia** & **UD** & **SD** & & **R** \\ \cline{2-10}  & **(m/s\({}^{2}\))** & **(cm/s)** & **(cm)** & **(cm\({}^{2}\)/s)** & **(g-s)** & **(cm)** & **(m/s)** & **(s)** & **(s)** & & **[km]** \\ \hline Minimum value & 1.81 & 30.70 & 5.28 & 285.59 & 0.62 & 41.59 & 10.72 & 1.78 & 1.10 & 4.30 & 1.00 \\ \hline Maximum value & 3.40 & 315.94 & 90.16 & 63,314.56 & 3.22 & 1132.40 & 83.48 & 9.65 & 9.41 & 6.20 & 22.00 \\ \hline Mean value & 2.59 & 139.96 & 27.78 & 11,391.21 & 2.03 & 361.92 & 34.55 & 5.63 & 4.60 & 5.48 & 12.43 \\ \hline Standard deviation & 0.44 & 73.12 & 24.11 & 15,232.34 & 0.61 & 267.70 & 18.01 & 2.21 & 2.22 & 0.54 & 4.93 \\ \hline Coeff. of variation (\%) & 16.90 & 52.24 & 86.80 & 133.72 & 30.24 & 73.97 & 52.12 & 39.17 & 48.32 & 9.88 & 39.66 \\ \hline \end{tabular}
\end{table} 
Table 2: Ranges of characteristic values for 30 selected earthquake records for the city of Zagreb. \begin{table}
\begin{tabular}{c c c c c c c c c c c} \hline  & **PGA** & **PGV** & **PGD** & **SED** & **ASI** & **HI** & **Ia** & **UD** & **SD** & & **R** \\ \cline{2-10}  & **(m/s\({}^{2}\))** & **(cm/s)** & **(cm)** & **(cm\({}^{2}\)/s)** & **(g-s)** & **(cm)** & **(m/s)** & **(s)** & **(s)** & & **[km]** \\ \hline Minimum value & 2.01 & 60.52 & 2.32 & 568.08 & 1.11 & 75.39 & 8.74 & 1.72 & 0.89 & 4.30 & 1.00 \\ \hline Maximum value & 4.25 & 535.92 & 404.60 & 378,857.5 & 3.81 & 1624.50 & 155.01 & 22.86 & 38.53 & 7.60 & 65.00 \\ \hline Mean value & 2.95 & 168.28 & 76.01 & 37,340.10 & 2.19 & 502.04 & 55.06 & 7.44 & 8.32 & 5.88 & 15.20 \\ \hline Standard deviation & 0.64 & 96.49 & 105.66 & 72,216.22 & 0.75 & 389.39 & 41.79 & 5.85 & 10.51 & 0.91 & 13.14 \\ \hline Coeff. of variation (\%) & 21.66 & 57.34 & 139.01 & 193.40 & 34.26 & 77.56 & 75.89 & 78.68 & 126.33 & 15.42 & 86.47 \\ \hline \end{tabular}
\end{table} 
Table 3: Ranges of characteristic values for 30 selected earthquake records for the city of Dubrovnik.