Optimization of Post-Tensioned Box Girder Bridges with Special Reference to Use of High-Strength Concrete Using AASHTO LRFD Method. Keywords: Concrete Box Girder Bridge, Prestress Force, Eccentricity, Prestress Losses, Reinforcement, Flexure strength, shear strength, SAP Model. ANALYSIS AND DESIGN OF POST-TENSIONED DECK TYPE BOX-GIRDER BRIDGE A post- tensioned deck type Box Girder Bridges of clear span 30m and width of roadway is 7. Post-Tensioning Layout – for Span-by-Span Construction – Spans 30.5 to 45.7 Meters. (270.6 KB PDF File).
Bridge structures constructed using post-tensioning have high intrinsic durability and are able to be built quickly with minimal impact on the human and natural environment. Post-tensioning also provides more flexibility in the layout of span lengths, bent configurations and roadway geometrics than precast I-girders or reinforced concrete box girders. Precast post-tensioned segmental concrete box girders are a popular technique for major long-span bridges, but they are seldom used for medium span situations where cast-in-place concrete, steel plate girder and prestressed I-beam designs predominate.