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Ko it er Institute Delfi, Delfi University of Technology, the Netherlands Jacky Mazars Laboratoire 3S, Institut National Polytechnique de Grenoble L.M T., Ecole Normale Superieure de Cachan, France Gilles Pijaudier-Cabot R&DO, Laboratoire de Genie Civil de Nantes-Saint Nazaire, Ecole Centrale de Nantes, France Jan G.M. van Mier Faculty of Civil Engineering and Geosciences, Delfi University