Reliability-based design of transmission and anchorage lengths in prestressed concrete elements

This work proposes new reliability-based formulations for the design of trans-mission and anchorage lengths in prestressed reinforced concrete, starting fromthe equations discussed and proposed byfibTG2.5“Bond and Material Models.”To this end, an extensive experimental dataset with more than 900 results wascollected from the scientific literature. Then, two deterministic models were pro-posed, one for the transmission and one for the anchorage length. For each,model uncertainty was evaluated, and then a probabilistic calibration of theirdistributions was carried out, separating the cases when sudden or gradual pre-stress release was applied. Then, probabilistic models were developed for trans-mission and anchorage length evaluation, depending on the prestress releasemethod: from them, it was possible to evaluate suitable coefficients to targetvarying reliability indexes. Particularly, two design situations were considered,for transverse stresses verification at the Serviceability Limit State (SLS) andshear and anchorage verification at the Ultimate Limit State (ULS). Lastly, thereliability of current deterministic models was verified