1. Associate Professor, School of Building Construction, College of Architecture, Georgia Institute of Technology, 280 Ferst Dr., Atlanta, GA 30332-0680 (corresponding author).
2. Visiting Scholar, School of Building Construction, College of Architecture, Georgia Institute of Technology, Atlanta, GA 30332; Assistant Professor, School of Engineering, Dept. of Structural and Construction Engineering, Masters Program in Environmental and Urban Engineering, Federal Univ. of Bahia-Brazil, Aristides Novis, 02, Federacao, Salvador, 40210-630 Bahia, Brazil.