1. Department of Civil Environmental and Architectural Engineering, University of Colorado Boulder, Boulder, CO 80309, USA
2. College of Computer, Mathematical and Natural Sciences, University of Maryland, College Park, MD 20742, USA
3. International Centre For Numerical Methods In Engineering (CIMNE), P. Gral. Martinez Campos, 41, 28010 Madrid, Spain
4. Department of Mathematical and Statistical Sciences, University of Colorado Denver, Denver, CO 80204, USA
5. Italian National Committee on Large Dams, 2300198 Roma, Italy
6. National Laboratory for Civil Engineering (LNEC), Avenida do Brasil, 101, 1700-066 Lisbon, Portugal