Prestress Losses in Concrete and the Estimation of Long-term Deflections and Camber for Prestressed Concrete Bridges
Abstract
The use of High Strength Concrete (HSC) in prestressed concrete bridge girders has become an acknowledged practice in the recent years. The effective designing of the prestressed bridge girders requires the accurate prediction of prestress losses. The accurate estimation of losses results in a reliable calculation of both camber and deflection. This research program investigates the need for accurate prediction of prestress losses and hence the camber and deflection in prestressed bridge girders. An analytical modeling in the form of a spreadsheet was developed reviewing the results and the recommendations from prior research programs. Through further refinement of the model and variations in design details, the results provide recommendations to ODOT and OTA that will more accurately determine prestress losses and long term camber/deflection in prestressed bridge girders. The research also suggested design changes to control deflection/ camber in prestressed concrete bridge girders.
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- OSU Theses [15752]