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AssigneesRe-Fer AG, Eidgenoessische Materialpruefungs-Und Forschungsanstalt Empa
InventorsMasoud Motavalli, Benedikt Weber, Wookijn Lee, Rolf Broennimann, Christoph Czaderski, Christian Leinenbach
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The method includes a tension element, for example in the form of flat steel, that is placed on the structure or structural part and can be guided around a corner. The flat steel can also wrap as a band around the structure, in which the two ends of the flat steel are either connected to one another or are separately connected to the structure by the end anchors or intersect to produce a clamping connection. The flat steel contracts as a result of a subsequent active and controlled input of heat using a heating element and generates a permanent tensile stress and, correspondingly, a permanent prestress on the structure. The structure, as equipped, has at least one tension element as a shape memory alloy which extends along the outer side of the structure and is connected by one or more end anchors
1-15. (canceled)
A method for producing a prestressed structure via one or more tension elements comprised of a shape memory alloy for reinforcing of a structure and having a polymorphic and polycrystalline structure, which, by increasing its temperature, is able to be brought from a martensitic state to a permanent austenitic state, said method comprising the steps of extending on the structure a tension element is guided around a corner of the structure, wherein at least one end anchor penetrate into the structure, or the tension element wraps around a structure as a band, wherein two ends of said tension element are either connected to each other via tensile connection or are separately connected to the structure via at least one end anchor or at least one intermediate anchor, respectively, which penetrate into the structure or the tension element overlaps or crosses on itself at least once in a clamping manner, the tension element, due to subsequent active and controlled heat input, contracts and generates a permanent tension and correspondingly the tension element extends freely via a layer enveloping the tension element, generates a permanent prestress and a residual tension up to fracture load of tension element on the structure.
Dependencies are inferred from the claim text.