1. Postdoctoral Fellow, Dept. of Civil Engineering, Univ. of Toronto, Toronto, M5S 1A4, Canada; formerly, Maintenance and Safety of Structures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
2. Senior Research Engineer, Maintenance and Safety of Structures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland.
3. Professor, Maintenance and Safety of Structures, Ecole Polytechnique Fédérale de Lausanne (EPFL), CH-1015 Lausanne, Switzerland (corresponding author). E-mail: eugen.bruehwiler@epfl.ch