Multi Strand Post Tensioning Anchors

The tendons of the RSF Multistrand Post-tensioning System are composed by bundles of strands of high strength steel and by anchorages placed at its extremities.

The strands are usually encased by a duct, sheath or tube. The void between the strands and the encasement may be filled by a material in order to inhibit corrosion and (in the case of bonded tendons) to bond the strands to the structure.

The RSF Multistrand System is compatible with bare strands and also with individually sheathed and protected strands. Usually, all strands of a tendon are simultaneously stressed, with each strand individually locked by a wedge inside a conical anchoring hole. The wedges clamp the strands and allow to transfer the stressing force from the hydraulic jack to the anchorage.

The design force defines the type and number of strands. The type of anchorage is defined by the project requirements and the category of use. The RSF Multistrand System includes anchorages with 4, 7, 9, 12, 15, 19, 22, 27, 31 and 37 strands. The intermediate units can be created leaving free some conical holes of the anchorage. In this case, the strands have to be arranged to center the applied load to the anchor head. The RSF Multistrand System (from 4 to 37 strand tendons) is mainly used for civil engineering structures.