1. Faculty of Civil Engineering and Building Services, Technical Univ. “Gheorghe Asachi” of Iaşi, Bd. Mangeron 43, 700050 Iaşi, Romania (corresponding author).
2. Faculty of Automatic Control and Computer Engineering, Technical Univ. “Gheorghe Asachi” of Iaşi, Bd. Mangeron 27, 700050 Iaşi, Romania.
3. Faculty of Civil Engineering and Building Services, Technical Univ. “Gheorghe Asachi” of Iaşi, Bd. Mangeron 43, 700050 Iaşi, Romania.