Switchgrass as a biofuels crop for the upper Southeast: Variety trials and cultural improvements

A method and apparatus for bending a grooved, H-shaped or the like shaped steel workpiece having a center web and two parallel flanges extending at right angles to and connected by the web in the plane of the web by cold-bending in which the inner surface of one of the two flanges has applied thereon an outward force by a pressure roller means and the inner surface of the other flange also has applied thereon an outward force by a pair of spaced pressure receiving roller means positioned on the opposite sides of the pressure roller means whereby the shaped steel workpiece has imparted thereto a bending moment without applying any buckling load on the web across the width thereof and the workpiece is then transferred in the longitudinal direction thereof with the workpiece held in pressure contact with the rollers.