A practical approach for finite-element modeling of transfer length in pretensioned, prestressed concrete members using end-slip methodology

This paper presents a numerical modeling approach that accounts for slip between prestressing strands and the surrounding concrete within the transfer zone. The objective of the study was to develop a modeling approach that can accurately and efficiently predict member behavior based on specified transfer lengths. The modeling approach uses three components: a matrix of solid elements to represent the concrete, truss elements to represent the prestressing strand, and nonlinear springs accounting for the interface between the prestressing strand and surrounding concrete. The force-versus-displacement curves for the nonlinear springs are based on the known relationship between end slip and transfer length. The results of 23 numerical models are included and compared with experimental data from corresponding test specimens. The study confirms the practicality and accuracy of the modeling approach to predict member behavior based on specified transfer lengths.