Umgelenkte Lamellen aus kohlenstofffaserverstärktem Kunststoff als freistehende Spannglieder im Konstruktiven Ingenieurbau

The use of CFRP-Strips as freestanding element for Bridge constructions seem to be promising; The high tensile strength of carbon fibre reinforced polymers, combined with the high compression strength of th concrete offer a durable construction system. The results of the current experimental work showed that the ultimate strength of the deviated CFRP-Strips is significantly affected by the bending radius, the Deviation angle and friction, so that the following recommendations can be drawn.
For small deviation angle of 15° and by using a bending radius of 1000 mm the reduction factor of the deviated strip was increased up to 95 % without any need for a Polyethylene layer, i.e. there is low contact pressure as well as a low friction effect on the breaking force of the strip.
With the help of Polyethylene layer (HD-HML) for a Deviation angle of 30° and by using a bending radius of 1000 mm the acceptance criteria for mandatory requirements, which are listed in the Guideline for European Technical Approval of Post-Tensioning Kits for Prestressing of Structures, can be satisfied, i.e. reduction factor up to 95%.
For deviation angles between 30° and 110° an ultimate strength reduction factor up to 85% should be considered in the design.