1. Research Assistant, Dept. of Civil Engineering, K. U. Leuven, Kasteelpark Arenberg 40, B-3001 Heverlee, Belgium. E-mail: Edwin.Reynders@bwk.kuleuven.be
2. Professor, Dept. of Civil Engineering, K. U. Leuven, Kasteelpark Arenberg 40, B-3001 Heverlee, Belgium.
3. Visiting Researcher, Dept. of Civil Engineering, K. U. Leuven, Kasteelpark Arenberg 40, B-3001 Heverlee, Belgium.
4. Structural Engineer, Ministry of Equipment and Transport (MET), Rue Côte d’Or 253, B-4000 Liège, Belgium.