1. Associate Professor, School of Civil Engineering, Architecture and Urban Design, Univ. of Campinas, Campinas 13083-889, Brazil.
2. Associate Professor, College of Agricultural Engineering, Univ. of Campinas, Campinas 13083-875, Brazil.
3. Professor, Dept. of Civil Engineering, DeVry Metrocamp, Campinas 13035-500, Brazil (corresponding author).
4. Director, Geoponto Engineering, Mogi das Cruzes 08773-530, Brazil.