Slip distribution model along the anchorage length of prestressing strands: Fid-Bau Portal

Slip distribution model along the anchorage length of prestressing strands

Martí-Vargas, J.R. / Hale, W.M. / García-Taengua, E. / Serna, P.

Highlights • Bond–slip behavior of strands at prestress transfer and at loading was analyzed. • Series of prestressed concrete specimens with different embedment lengths were tested. • The test method did not distort the bond and showed influence of concrete strength. • New results by measuring slips at different cross sections of a member were obtained. • An analytical bond model to predict strand slips along the anchorage length is presented.

Abstract An analytical model to predict strand slips within both transmission and anchorage lengths in pretensioned prestressed concrete members is presented. This model has been derived from an experimental research work by analysing the bond behavior and determining the transmission and anchorage lengths of seven-wire prestressing steel strands in different concrete mixes. A testing technique based on measuring the prestressing strand force in specimens with different embedment lengths has been used. The testing technique allows measurement of free end slip as well as indirect determination of the strand slip at different cross sections of a member without interfering with bond phenomena. The experimental results and the proposed model for strand slip distribution have been compared with theoretical predictions according to different equations in the literature and with experimental results obtained by other researchers.