1. Dept. of Structural Engineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy (corresponding author).
2. Golder Associates S.R.L., via Decembrio 28, 20137 Milano, Italy.
3. Dept. of Structural Engineering, Politecnico di Milano, Piazza Leonardo da Vinci 32, 20133 Milano, Italy.