1. Postdoctorate Research Assistant, Escola Politécnica, Universidade de São Paulo, Brazil, Av.; and, Professor Almeida Prado, 83, tr 2, Cidade Universitária, São Paulo/SP, Brazil, 5508-900. E-mail: marceloasmachado@gmail.com
2. Professor, Dept. of Civil and Environmental Engineering, Virginia Tech, 214 Patton Hall, Blacksburg, VA 24061. E-mail: sotelino@vt.edu
3. Associate Professor, School of Civil Engineering, Purdue Univ., 550 Stadium Mall Dr., West Lafayette, IN 47907-2051. E-mail: jliu@purdue.edu