1. Civil Engineer, Dept. of Structural Engineering, School of Engineering of São Carlos, Univ. of São Paulo, São Carlos, São Paulo 13566-590, Brazil.
2. Professor, Dept. of Structural Engineering, School of Engineering of São Carlos, Univ. of São Paulo, São Carlos, São Paulo 13566-590, Brazil.
3. Associate Professor, Dept. of Structural Engineering, School of Engineering of São Carlos, Univ. of São Paulo, São Carlos, São Paulo 13566-590, Brazil.
4. Professor, Dept. of Structural Engineering, School of Engineering of São Carlos, Univ. of São Paulo, São Carlos, São Paulo 13566-590, Brazil (corresponding author).