Faithin Omaha eBook Collection

Download or read book Fatigue Performance of Large-sized Long-span Prestressed Concrete Girders Impaired by Transverse Cracks written by and published by . This book was released on 2002 with total page 161 pages. Available in PDF, EPUB and Kindle. Book excerpt: Two full-size AASHTO prestressed concrete girders, one Type III and one Type V, were tested for fatigue resistance. Both girders were impaired by transverse cracks in their top flanges near the midspan and the cracks extended well into the web of each girder. Each girder was subjected to one million cycles of service load and 2,500 cycles of intermittent overload as if the girder were made composite with a cast-in-place bridge deck. The overload was equivalent to 75% of the ultimate capacity of the composite girder. Prior to the fatigue test, each girder was tested beyond its cracking load to create flexural cracks in its tension flange. After the fatigue loadings, the girders were tested to failure to determine their ultimate load capacities. Analytical studies were also conducted to model the behavior of the girders by using two separate computer programs, one called Cracked Beam and the other Response 2000.