Development of guidelines for transportation of prestressed concrete girders.
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Development of guidelines for transportation of prestressed concrete girders.

Filetype[PDF-216.98 KB]


  • English

  • Details:

    • Alternative Title:
      Research project capsule10-5st
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    • Abstract:
      "Prestressed concrete girders are an economical superstructure system for bridges. With the

      advent of higher strength concretes and more effi cient cross sections, the use of long span (>100

      ft.) prestressed girders are now specifi ed. Such long span girders require special consideration

      during manufacturing, transporting, handling, and erecting. Many forces associated with

      construction of a precast concrete girder are well understood – less, however, is known about

      the forces a girder is subjected to during transport. While girders are designed for strong axis

      loadings and can readily accommodate such loading during transport, they are typically braced in

      service and may have inadequate resistance to lateral or lateral-torsional load eff ects. As a result,

      girders have arrived on job sites exhibiting cracks indicative of weak axis bending or torsion. In

      other instances, trucks transporting girders have rolled as the girders laterally buckled. These

      transportation problems can delay construction while the girders are repaired or replaced and

      lead to a reduced service life as moisture and chlorides infi ltrate unrepaired cracked girders.

      The Louisiana Department of Transportation and Development (LADOTD) has observed these

      transportation problems with prestressed concrete girders. Building on research into girder

      stability design by Laszlo and Imper and estimations of transportation stresses by Mast, LADOTD

      recently instrumented two 150-ft. long prestressed bulb-tees during transport in an eff ort to

      assess the forces on the girders. Transportation of these instrumented girders resulted in some

      weak axis cracking."

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