Abstract
The objective of this project is to predict change of stresses in prestressed and post-tensioned strands of spliced girder bridge at various time steps and loadings, and top and bottom fiber stresses of concrete girder. For this project three different girder bridges were analyzed. First bridge was a simple span bridge 80ft long with prestressed girder only, the purpose of this example is to show the procedure adopted by ASSHTO-LRFD 2012 to calculate immediate and long term losses in prestressed strands by refined method Second example is a simple span bridge with three spliced girders “45ft, 101ft, 45ft” and two temporary supports at girder splicing, these three prestressed segments connected by three post-tensioned tendons to work as a full simple span. In this example, equation of concrete creep and shrinkage of ASSHTO-LRFD are extended to accommodate presence of post-tensioned strands in addition to prestressed strands. Third example is two simple span of prestressed girders “105ft & 90ft” length connected by post-tensioned tendons to work as two continuous span, To verify accuracy of the obtained results, Summery of analysis results were compared with software program “Leap-Consplice” results at the end of each bridge example.