Applicability of 2360 MPa grade prestressing steel strand: Performance of material, bond, and anchorage system

A 2360 MPa grade PS strand has been developed with the tensile strength increased by about 27% compared to the existing 1860 MPa grade PS strand. In order to apply this new material to prestressed concrete (PSC) structures, the material performance and characteristics have to be identified, while the conformity to the existing design criteria must also be variously evaluated and investigated. The study conducted a series of material performance evaluations to apply the newly developed 2360 MPa grade PS strand to a real structure. Firstly, the study evaluated the material properties of the 2360 MPa grade strand itself for all criteria; secondly, the evaluation of the bond performance between 2360 MPa grade strand and concrete; and thirdly, the performance of the anchorage system for 2360 MPa grade strand. As a result, the material performance, bond performance, and anchorage system performance for the 2360 MPa grade PS strand satisfied all specified performance criteria. Thereby the 2360 MPa grade strand could be applied directly to pre-tensioned and post-tensioned PSC structures. However, it was also found that the method of calculating the yield strength for the PS strand of ASTM A416 is unsuitable for higher strength PS strand than the 1860 MPa grade PS strand. In addition, non-linear and bilinear stress-strain models of 2360 MPa grade PS strand for analysis and design of PSC structures were presented.