Development of guidelines for transportation of prestressed concrete girders.

Details

• Alternative Title:
  Research project capsule ; 10-5st
• Creators:
  McGormley, Jonathan C.
• Corporate Contributors:
  Louisiana Transportation Research Center
• Subject/TRT Terms:
  Bridge Construction Girders Prestressed Concrete Prestressed Concrete Bridges
• Resource Type:
  Tech Report
• Geographical Coverage:
  Louisiana
• Corporate Publisher:
  Louisiana Transportation Research Center
• 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."
  
  
• Format:
  PDF
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha256:b4002ce117668188a411107fe2cf682816aded5ef19ee148c4a8b2bbcb788254
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23655/dot_23655_DS1.pdf
• File Type:
  [PDF - 216.98 KB ]