The discussion revolves around the mechanics of beam buckling, specifically focusing on y-y axis buckling and the associated moments of inertia. Participants explore the implications of beam rotation, the role of cables in restraining movement, and the definitions of fixed and pinned supports in the context of beam behavior under load.
Participants do not reach a consensus on the mechanics of y-y axis buckling, the role of cables, or the definitions of fixed and pinned supports. Multiple competing views remain, and the discussion is characterized by uncertainty and clarification attempts.
Participants express confusion over the definitions and implications of buckling behavior, the roles of different axes, and the structural constraints imposed by cables. There are unresolved questions regarding the assumptions made in the discussion and the interpretations of diagrams referenced.
No. It means the beam rotates about the y-y axis, which is the weaker axis for this I-beam.chetzread said:
See above.
For someone who has a lot of questions about the bending of beams, you also seem to have a lot of opinions about what is correct and what is not.
How can the beam rotate ? It can only buckle either in x or y direction, right ? Or do you mean for y-y aixs buckling , it means the beam bend towards positive or negative x -direction?SteamKing said:
chetzread said:
i'm confused now ... The cable will prevent the beam from moving in y-y direction , right ? why the author stated the cable will prevent the beam from moving along x-axis ?SteamKing said:
No. How can it?chetzread said:
Well, take another look at the diagram. There are two cables attached to the end of the beam, one on either side. If the beam wants to move one way along the x-axis, one of the cables will be put in tension, and the opposite one will probably go slack. Same thing happens when the beam wants to move in the opposite direction along the x-axis.
@SteamKing it's stated in the second lines of notes , the cable will prevent the cables from moving along x-axis ... why is it so ? is the notes wrong ?chetzread said:
chetzread said:
SteamKing said:
chetzread said:
please refer to the left bottom part of the notes , it's stated that in y-axis the column will behave as the fixed and pinned at the top end .SteamKing said:
Yeah, but there's still no actual pin here. The column behaves in a similar fashion to one which is fixed at one end and pinned at the other. In this column, the two cables at the top of the column act to partially restrain the movement of the column.chetzread said:
so , the 'pin' will allow the column to bend about x-axis freely (act as cantilever)?SteamKing said:
What do you mean by it ? I don't really understand ... In y-y axis buckling , the column bend towards + / - x-axis and vice versa , right ?SteamKing said:
Yes, but it doesn't move from side to side, thus staying in the x-z plane. In case you are wondering, the z-axis runs along the un-buckled length of the column.chetzread said:
<br />Well, take another look at the diagram. There are two cables attached to the end of the beam, one on either side. If the beam wants to move one way along the x-axis, one of the cables will be put in tension, and the opposite one will probably go slack. Same thing happens when the beam wants to move in the opposite direction along the x-axis.
