1. 1 Postdocoral researcher, KTH Royal Institute of Technology, School of Architecture , Osquars backe 5, SE 100 44 Stockholm , Sweden
2. 2 PhD. Candidate, KTH Royal Institute of Technology , Dept. of Civil & Architectural Engineering, Div. of Concrete Structures , Brinellvägen 23, SE 100 44 Stockholm , Sweden
3. 3 Professor, KTH Royal Institute of Technology , Dept. of Civil & Architectural Engineering, Div. of Concrete Structures , Brinellvägen 23, SE 100 44 Stockholm , Sweden