Title: Time-Dependent Prestress Losses in Post-Tensioned Spliced Girders Made of High Performance Concrete
Abstract: The use of post-tensioned spliced-girders in bridge structures allows engineers to design bridges with longer span lengths. Long span precast girder bridges are an ideal design solution for crossing of waterways, major highways, or other obstacles where it is desirable to eliminate intermediate piers. Post-tensioned spliced-girders further the economies of long span pre-cast girders by allowing girders to be cast, shipped, and erected in smaller segments. The Washington State Department of Transportation (WSDOT) is one of several states involved in the design, fabrication and construction of spliced-girders using high performance concrete (HPC). The importance of accurately predicting time-dependent material properties and prestress losses becomes greater as span lengths increase. Limited experience on the use of spliced-girders and properties of HPC makes the prediction of prestress losses due to time-dependent effects difficult. Several methods are available in the literature for predicting the time-dependent prestress losses of spliced-girders. The WSDOT BDM1 method for estimating time-dependent prestress losses is simple and suitable for simple span post-tensioned spliced-girders. This paper focuses on estimating time-dependent prestress losses in post-tensioned spliced-girders using the AASHTO LRFD2, the NCHRP Project 4963, and the WSDOT BDM methods. A numerical analysis is provided and results obtained from the different methods are discussed.
Publication Year: 2004
Publication Date: 2004-01-01
Language: en
Type: article
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