method of prestressing and bending in steel and concrete composite beams.

摘要

A method of producing a prestressed beam of steel or steel and concrete having at least one flange in which a plurality of spaced apart transmission elements arranged symmetrically with respect to the center of the span of the beam are secured to the flange, tensioning wires are attached to each two symmetrically disposed transmission elements with the wires extending at predetermined distances from the flange, tensioning the wires to apply to the beam, via the transmission elements, on the one hand solely compressive forces and, on the other hand, in positions corresponding to each transmission element, a bending moment which is opposite to that of the loads to be applied in use, and applying a stress to the beam during the tensioning of the wires substantially to counteract the bending moments. At least one guide element for the wires may be disposed between two symmetrically disposed transmission elements to prevent lateral buckling of the beam during tensioning of the wires. After tensioning the wires, the transmission elements and optionally the flange of the beam are encased in concrete.