Modeling of Transfer Region with Local Bond-Slip Relationships


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Title: Modeling of Transfer Region with Local Bond-Slip Relationships

Author(s): Chadon Lee, Songhee Lee, and Sangmin Shin

Publication: Structural Journal

Volume: 114

Issue: 1

Appears on pages(s): 187-196

Keywords: bond-slip; modeling; pretensioned; test; transfer length

Date: 1/1/2017

A theoretical model incorporating a rigid-linear local bond-slip relationship is presented to estimate axial displacements and strains of concrete and strands as well as slip and bond stresses along the span in a prismatic member. The effects of influential parameters on the local bond-slip relationship were identified from 92 transfer length test results. The validity of the developed model was then verified by its close predictions of the experimentally measured values from five beams tested in this study. Based on the developed model, an equation for the transfer length was suggested that considers the effect of concrete strength, prestress, strand diameter and its ratio, cover thickness, and type of release. The suggested equation predicted 92 experimentally measured transfer lengths better than other equations from different codes and literature. The overall average and standard deviation for the ratios of theoretical prediction to measured transfer length were 0.98 and 0.11, respectively.