1. Assistant Professor, Dept. of Civil Engineering, The Faculty of Engineering and Architecture, Univ. of Cukurova, 01330 Balcali, Adana, Turkey (corresponding author).
2. Reader, Dept. of Civil Engineering, Univ. of Strathclyde, John Anderson Building, 107 Rottenrow, Glasgow G4 ONG, U.K.
3. Dipl. Ing., INSOND Spezialtiefbau, Ges.m.b.H, Ungargasse 64/1/210 Austria, 1030, Vienna, Austria.