CURVED STEEL

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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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Your service was excellent as always. Delivery time was great and the quality of the rolling looked really good from what I could see on the truck. Our success on these projects is largely due to partners like you who work so hard to help us get the job done. We appreciate the work you all do.


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