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 1. Field of the Invention
 The invention relates generally to spanning or beam members and, more particularly, to beam members formed of a pair of opposing C-shaped flanges, a convoluted web for added strength, and an end plate for structurally protecting and interconnecting the beam members.
 2. Background of the Art
 Beam members are widely used in the construction industry, not only as a permanent building elements but also as a part of construction formwork, such as in scaffolding, concrete forms, and the like. An example of beam members used in formwork include the soldier described in U.S. Pat. No. 4,964,256, which is used as upright and horizontal structural members, inclined braces, columns, shores, and walers. Another example is the lightweight steel beam member used as a support for decking or sheeting as a part of a concrete forming system, as described in U.S. Pat. No. 5,307,601. These beam members are also used as metal studs and other building components where they substitute for conventional dimensional lumber.
 Such beam members are made in a wide variety of shapes and designs and of a wide variety of materials. With the widespread use of roll-forming techniques, it has become increasingly common to use beam members that are made of metal sheet material formed primarily by roll-forming to create relatively lightweight yet strong beam members. One way to achieve desired efficiencies and reduce the cost of the beam member is through the use of thinner metal sheet material in the roll-forming process, provided that the resultant beam member is designed to retain the desired strength and other characteristics. The thinner sheet material is less expensive, easier and cheaper to roll-form, and lighter in weight.
 In the context of construction formwork, the beam members typically rest on top of support posts (mono-posts™). While the beam members vary in length, normally the beams must interconnect to span the required length. Commonly, the interconnection consists of a collar that secures around the overlapped ends of two beams. This point of interconnection typically requires a separate support post, since the connection usually comprises a weak point. Overlapping the beam members can help to alleviate this problem but this requires using either more beam members, or longer beam members. Additionally, similar problems occur with beam members used in permanent building construction. This system of interconnection generally adds an undesirable level of complexity, requires more support posts, and the interconnection sites constitute a potential point of failure in the support system.
 The invention consists of a beam member that has a pair of longitudinally extended and opposing flanges each of which includes a central web section and a pair of inwardly extended leg sections such that each flange is generally C-shaped in transverse cross section. A longitudinally extended web member is interposed between the opposing pair of flanges and has a pair of longitudinally extended sides each of which is in contact engagement along the central web section of a corresponding one of said pair of opposing flanges. The web member has one or more convoluted sections with alternating lateral protrusions that extend transversely across the width or height of the web. The protrusions extend laterally to be adjacent along a portion of a corresponding opposite pair of said leg sections of the flanges. The sides of the web are welded to the flanges at the central web section thereof and the protrusions of the web are welded to the adjacent portions of the leg sections of the flanges. An end plate secures to the opposing flanges and to the web member interposed therebetween, providing a superior means for interconnecting the beam members. The resultant beam member may be manufactured out of relatively thin sheet material and yet have a high stiffness and weight bearing capacity before crushing.
 An object of the present invention is to provide a beam member for use in concrete forming apparatus and also as a building component that will form a permanent part of the constructed building.
 Another object of the invention is to provide a beam member with a convoluted web that is roll-formed from a sheet of metal material and having improved stiffness and resistance to crushing under load.
 A further object of the invention is to provide a beam member having a corrugated web welded to a pair of opposing flanges that are either U-shaped or C-shaped in transverse cross section to comprise a beam member having improved stiffness and resistance to crushing under load.
 Still another object of the invention is to provide a metal beam member that can be used as a replacement for dimensional lumber and includes flanges that are penetrable by screws or hand-driven nails.
 Yet another object of the invention is to provide a beam member that can readily interconnect with like beam members.
 These and other objects of the invention will become apparent from a review of the following specification, attached drawings, and appended claims.
 Illustrated in FIGS.
 The flanges
 The web
 To complete the beam member
 In the preferred embodiment, the protrusions
 Although the preferred embodiment has been described as having the web and flanges manufactured from specified sheet material, sheet materials of different thickness or other characteristics may be used depending on the desired performance characteristics of the resulting beam member. Additionally, while the protrusions or corrugations of the web in the preferred embodiment are comprised of straight or flat sections made by a series of bends across the full transverse width of the sheet, other diverse convolutions could be used. Additionally, in the preferred embodiment, the convoluted section extends the full length of the web, whereas it may be desirable to provide one or more convoluted sections that are less than the full length. Further, while flanges of a generally C-shape are used in the preferred embodiment, flanges of a U-shaped cross section could be employed, albeit with some loss in strength and possible added material costs.
 In contrast to the free end portions
 In the preferred embodiment, the end plate
 The end plate
 The advantage of this embodiment comprises the fact that the beam member
 Although the invention has been described with respect to a preferred embodiment thereof, it is to be also understood that it is not to be so limited since changes and modifications can be made therein which are within the full intended scope of this invention as defined by the appended claims.