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SPECIALTY BENDING: OFF-AXIS BENDING


AISC Design Guide 33 Curved Member Design Section 2.2.2

For off-axis bends, also called conical rolling, the member is curved about a non-principal or non-geometric axis. Most off-axis bends are fabricated with a constant rotation relative to the plane of curvature; however, they can also be formed with a variable twist along the member axis. Special tooling is often required to limit distortion and ensure dimensional accuracy. Off-axis bends are used when members are both curved and sloped, and a member axis must be parallel to the curved surface. In commercial structures, this can occur in canopies, arched roofs, and horizontal members in a dome. These members are also used for circumferential stiffeners in industrial cone-shaped plate structures, such as hoppers and stacks.


Less experienced bending companies will struggle with deformation when bending materials off-axis. It is recommended to ask the bending company to provide distortion estimates if you require off-axis bends to ensure you will be satisfied with the finished product.


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I have some history with Albina; having used you guys as a vendor at 3-separate companies over about 25-yrs. As I told the owners of my current company, when we first started looking at the project you rolled for us, “ … send it to Albina. If they can’t do it, it can’t be done.”


Tom M.

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