Verstärkung mit vorgespannten eingeschlitzten Lamellen

Strengthening using Prestressed Near Surface Mounted Strips

Exernally bonded carbon fiber reinforced plastic (CFRP) strips are used since several years for strengthening of structures. The high strength of the strips cannot be exploited in most applications. Near surface mounted strips offer several advantages, which allow for further optimization together with prestressing. For the prestressing action a special anchoring device, based on the Composite Wedge Principle, was developed, which allows a simple and quick prestressing procedure. Additionally the anchorage weighs only 8 kg, which is especially beneficial when manipulations on the lower surface of the structure are necessary. The anchorage will be removed after prestressing and the permanent anchorage of the ends of the strips will be established by bond. No steel parts remain in the structure, after completing the strengthening. This results in low maintenance and a high durability. The efficiency of the developed systems and the prestressed plate strips was examined experimentally. In these investigations a perfect functionality could be demonstrated.