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:
  • Girders
  • Prestressed concrete
  • Prestressed concrete bridges
  • Bridge construction
• 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."
  More +
• Format:
  PDF
• Download URL:
  https://rosap.ntl.bts.gov/view/dot/23655/dot_23655_DS1.pdf
• File Type:
  [PDF - 216.98 KB]
• Collection(s):
  US Transportation Collection
• Main Document Checksum:
  urn:sha-512:82d9d8fd3c4a0df79ec96b8ff7a6ba5b77784d9e06779ecaecc620ffe300ee9a74d8ea0f8311598fc245507707165b9385264f06e41aa6806076f87f82593c57