1 Professor, Dept. of Civil Engineering, Istanbul Bilgi University, Istanbul, TURKEY 34060 2 PhD candidate, Dept. of Civil Engineering, Gazi University, Ankara, TURKEY 06570 3 PhD candidate, Dept. of Civil Engineering, Purdue Univ.A, West Lafayette, IN, USA 47202 4 Associate Prof. Dept. of Civil Engin. Istanbul Technical Univ. Istanbul, TURKEY 34469 Şener S, Çağlar Y, Şener KC, Gündüz N, The Differential Shrinkage Displacement of Box Sections Prestressed Concrete Bridges.Proceedings of the Istanbul Bridge Conference, 2014. Istanbul Bridge Conference August 11-13, 2014 Istanbul, Turkey THE DIFFERENTIAL SHRINKAGE DISPLACEMENTS OF BOX SECTIONS PRESTRESSED CONCRETE BRIDGES Sıddık Şener 1 , Yasin Çağlar 2 , Kadir Can Şener 3 , Necmettin Gündüz 4 ABSTRACT In this study, long terms deflections because of the differential shrinkages of box cross section were determined for seven prestressed concrete bridges. In these box girder bridges, the top slab typically has a uniform or nearly uniform thickness of about 250mm, while the bottom slab thickness can vary from about 250mm at midspan to 1.5m at the support. For a concrete slab, the rate of drying is roughly inversely proportional to the square of its thickness. The maximum deflection because of the differential shrinkage was obtained as a 0.257m for Gülburnu Bridge.