Temperature Gradient and Its Effect on Long-Span Prestressed Concrete Box Girder Bridge

Optimization of Precast Prestressed Concrete Bridge Girder Systems

60 A practical approach to the optimal design of precast, prestressed concrete highway bridge girder systems is presented. The approach aims at standardizing the optimal design of bridge systems, as opposed to standardizing girder sections. Structural system optimization is shown to be more relevant than conventional girder optimization for an arbitrarily chosen structural system. Bridge system...

Strengthening of Impacted Prestressed Concrete Bridge I-Girder Using Prestressed Near Surface Mounted C-FRP Bars

Effects of Temperature Variations on Precast, Prestressed Concrete Bridge Girders

The monitoring of a precast, prestressed girder bridge during fabrication and service provided the opportunity to observe temperature variations and to evaluate the accuracy of calculated strains and cambers. The use of high curing temperatures during fabrication affects the level of prestress because the strand length is fixed during the heating, the coefficients of thermal expansion of steel ...

Design and implementation of a monitoring system applied to a long-span prestressed concrete bridge

Currently long-term monitoring systems are mandatory in major civil engineering structures like bridges, tunnels and dams. Generally, they monitor a set of physical, chemical and mechanical parameters in critical sections of the structure by incorporating appropriated sensors. The set of collected data demonstrates great potential in the prevention of damage and contributes to a more efficient ...

Explanation of Excessive Long-Time Deflections of Collapsed Record-Span Box Girder Bridge in Palau

Explanation of the excessive deflections of the Koror-Babeldaob (KB) Bridge in Palau is presented. This bridge was built in 1977 by the cantilever method and collapsed 3 months after remedial prestressing in 1996. It was a segmental prestressed concrete girder having the worldrecord span of 241 m (790 ft.) and maximum girder depth of 14.17 m (46.5 ft). The final mid-span deflection was in desig...