Self-stressing engineered composites that include a matrix containing self-stressing reinforcement that is activated by an activator that causes, in situ, the self-stressing reinforcement to transfer at least some of its pre-stress into portions of the matrix adjacent the self-stressing reinforcement. In some embodiments, the activator can be of a self-activating, an internal activating, and/or an external activating type. In some embodiments, the self-stressing reinforcement includes an active component that holds and transfers pre-stress to a matrix and a releasing component that causes the active component to transfer its pre-stress to the matrix. In some embodiments, the self-stressing reinforcement is initially unstressed and becomes stressed upon activation. Various engineered composites, self-stressing reinforcement, and applications of self-stressing engineered composites are disclosed.

A self-stressing shape memory alloy (SMA)/fiber reinforced polymer (FRP) composite patch is disclosed that can be used to repair cracked steel members or other civil infrastructures. Prestressed carbon FRP (CFRP) patches have emerged as a promising alternative to traditional methods of repair. However, prestressing these patches typically requires heavy and complex fixtures, which is impractical in many applications. This disclosure describes a new approach in which the prestressing force is applied by restraining the shape memory effect of nickel titanium niobium alloy (NiTiNb) SMA wires. The wires are subsequently embedded in an FRP overlay patch. This method overcomes the practical challenges associated with conventional prestressing.

Disclosed is an automatic leveling CFRP plate pre-stressing and tensioning device for a curved surface structure, including a fixed end mechanism and a tension end mechanism, one end of the CFRP plate is connected to the fixed end mechanism and the other end is connected to the tension end mechanism, and the fixed end mechanism cooperating with the tension end mechanism to reinforce a curved surface. The fixed end mechanism includes a fixed end base plate, a fixture, a fixed end CFRP plate clamping plate, and a second high-strength bolt. The fixed end base plate is provided with a slide groove, the fixture is hinged within the slide groove by the second high-strength bolt; the fixture is provided with a fixture groove, and a size of the fixture groove decreases from one end of the fixture near the tension end mechanism to the other end of the fixture.

The disclosure relates to a device and method for introducing a force into tension members made of fiber-reinforced plastic flat strip lamella. The device can include at least one clamping element, which is arranged on the tension member and has at least one contact face with the tension member. At least one rigid sleeve can be arranged around the at least one clamping element and the tension member and thereby exerts a clamping pressure on the tension member via the clamping element. The clamping element can be formed of plastic material having a modulus of elasticity ranging between 1000 and 5000 MPa, bending tensile strength of 25 MPa and pressure resistance of 25 MPa.

The clamp anchorage with locking nut and bolt covers is similar to a conventional clamp anchorage, but with additional first and second locking plates. A plurality of first and second covers each have a head portion and a shaft. Each of the shafts has a cavity defined therein. The shafts of the plurality of first covers are respectively received within a plurality of first openings in the first locking plate such that the cavity formed in each of the shafts of the plurality of first covers receives a respective bolt head. The shafts of the plurality of second covers are respectively received within a plurality of second openings in the second locking plate such that the cavity formed in each of the shafts of the plurality of second covers receives a respective nut. The first and second covers may be made of a non-corrosive material.