1. Civil Engineer, Ph.D. Candidate, Dept. of Civil Engineering.,Laboratory of Reinforced Concrete, Demokritus Univ. of Thrace (DUTh), Xanthi 67100, Greece.
2. Professor, Dept. of Civil Engineering, Laboratory of Reinforced Concrete, Demokritus Univ. of Thrace, Xanthi 67100, Greece.