Effects of Increasing the Allowable Compressive Stress at Release on the Shear Strength of Prestessed Concrete Girders







16. Abstract In recent years, several research projects have been conducted to study the feasibility of increasing the allowable compressive stress in concrete at prestress transfer, currently defined as 0.60f'ci in the AASHTO LRFD Bridge Design Specifications. Increasing the limit would result in many economical and design benefits for the precast concrete industry, such as increased span lengths and faster turnover of beams in stressing beds. This research study focuses on the effects of increasing the allowable compressive stress at release on the shear strength of prestressed concrete members, a topic which has not yet been explored by past research projects. The current experimental work is funded under TxDOT Project 5197, which initiated in 2004 at the University of Texas at Austin.





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