Beams and girders Beams and girders desaintvenant (Structural) (OP) 2 Sep 06 13:12 Is there any difference between the words "beam" and "girder" ?Thanks Alessio SpigarelliStructural Engineer RE: Beams and girders UcfSE (Structural) 2 Sep 06 14:21 Typically a girder is larger than a beam, or may support several beams. RE: Beams and girders DaveAtkins (Structural) 4 Sep 06 08:03 I use the term "girder" to describe a member that has other members framing into it, and the term "beam" to describe a member that supports only decking or sheathing, with no other members framing into it. DaveAtkins RE: Beams and girders KeySol (Structural) 5 Sep 06 10:15 The way that I was taught in school and now in professional practice is that:A girder is a memeber that is in the floor system and has other members tying into the side of it.A beam is a member that is dropped or below the floor system and has members bearing on top of it. RE: Beams and girders HgTX (Civil/Environmental) 5 Sep 06 12:02 In the steel bridge world, they often use "girder" to mean "built-up plate girder" and "beam" to mean "rolled section".Hg Eng-Tips policies: FAQ731-376 RE: Beams and girders yates (Aerospace) 3 Nov 06 05:04 In structural mechanics, a beam is a virtual device which can only resist bending. A girder also resists bending but also has some torsional resistance. I vote for Keysol's definition. RE: Beams and girders GregLocock (Automotive) 7 Nov 06 06:26 But a beam element in FEA has torsional rigidity, so I think your definition is rather restricted. I can't remember Shigley, Timoshenko or Roark making that distinction.To me a girder has an implication of being fabricated from sub-components, as HgTX suggests. CheersGreg LocockPlease see FAQ731-376 for tips on how to make the best use of Eng-Tips.