1. Ph.D. student, KTH Royal Institute of Technology , Dept. of Civil & Architectural Engineering, Div. of Concrete Structures, Brinellvägen 23 , SE 100 44 Stockholm , Sweden
2. Professor, KTH Royal Institute of Technology , Dept. of Civil & Architectural Engineering, Div. of Concrete Structures , Brinellvägen 23, SE 100 44 Stockholm , Sweden
3. Ph.D. Affiliated faculty, KTH Royal Institute of Technology , Dept. of Civil & Architectural Engineering, Div. of Concrete Structures , Brinellvägen 23, SE 100 44 Stockholm , Sweden