Tensile stress limits for high strength concrete prestressed structures
by Fayez Moutassem; Mohammad I. Hossain
International Journal of Structural Engineering (IJSTRUCTE), Vol. 12, No. 1, 2022

Abstract: High strength concrete (HSC) is regularly used in precast prestressed concrete structures. The allowable tensile stresses in various codes do not account for high early strength HSC exceeding 10,000 psi (69 MPa). In this study, design equations are developed for the tensile stress limits at the time of initial prestress and at service. An experimental program is developed and it involved the use of mineral admixtures and subjecting fresh concrete to 24 hours of accelerated heat curing to mimic actual field conditions. Comparison between various design codes (ACI 318, AASHTO, and LRFD) has revealed that all the code equations significantly underestimated the allowable tensile stresses at service and are therefore too conservative. The proposed tensile stress limits would ensure a more economical design of high strength prestressed concrete members.

Online publication date: Tue, 30-Nov-2021

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