Title:
Algorithm for Predicting Development and Transfer Length of Prestressing Strand across Multiple Variations
Author(s):
Cabage
Publication:
Web Session
Volume:
Issue:
Appears on pages(s):
Keywords:
DOI:
Date:
10/23/2022
Abstract:
In this study high-capacity strand (0.62-inch, 0.7-inch, and/or Grade 330) and the effects the strand has upon transfer and development length within prestressed concrete beams were examined. Published works indicate that current ACI and PCI formulas signifcantly overestimate the transfer and development length for high-capacity strand. As a result, the prestress concrete beam design process may not accurately predict the stresses within the end region of the beam. This may result in improper shear reinforcement design. In this study investigators observed a correlation with transfer and development length, strength of concrete, geometry of the strand, material properties of the strand, and strand spacing. An algorithm was developed using statical models which will enable the designer to predict transfer length more accurately at release and development lengths at ultimate and during the life of a prestressed component. Once the algorithm is finalized, the results will be compared to transfer and development lengths established from laboratory experimentation and published works performed upon multiple strand types and concrete strengths. The investigators will then create a software application that will aid the designer in specifying strand type and spacing.