why the steel bars in concrete are round why not diamond shape of rect
why the steel bars in concrete are round why not diamond shape of rect
(OP)
Respected Sir,
Why the bars use for reinforcement are round , why they are not diamond shape or rectangular shape , can there any other shape if yes which shape .
Why the bars use for reinforcement are round , why they are not diamond shape or rectangular shape , can there any other shape if yes which shape .






RE: why the steel bars in concrete are round why not diamond shape of rect
In bending, rebars with corners create significant stress concentrations on the concrete, thus failing the bond. This condition does not occur with round bars under normal loading. Additionally, if other than round, there would be some preferential orientation of the rebar, which makes for difficult construction.
Also, when bending the rebar, square or other corners tend to fracture. Another reason that round cross-sections are used.
Ron
RE: why the steel bars in concrete are round why not diamond shape of rect
In addition to the reasons explained by Ron, lower cost of rolling and deforming for round bars might be a good reason for their extensive usage.
RE: why the steel bars in concrete are round why not diamond shape of rect
Usually only the small bar sizes were twisted because the machine necessary became too large, in those days. Later this pattern was pretty much superseded by deformed bar, which is also (always??) cold worked by twisting.
Any other eccentric or singly-symmetrical shape will cause placement problems ... a bar has to (at least) have the same section properties in two orthogonal directions.
Anthony Tugwell
Project Director & Consulting Engineer - now in Australia