1. Professor, Dept. of Civil Engineering, Federal Univ. of Santa Catarina, St. João Pio Duarte Silva, Córrego Grande, No. 205, Florianópolis 88040, SC 900, Brazil (corresponding author).
2. Professor, Dept. of Civil Engineering, Federal Univ. of Santa Catarina, St. João Pio Duarte Silva, Córrego Grande, No. 205, Florianópolis 88040, SC 900, Brazil.