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Structural

Bent

In Plain English

A rigid frame made of columns and a beam that forms one cross-section of a building's structural skeleton.

Definition

A transverse rigid frame that forms the primary structural unit of a building, typically consisting of columns and a beam or rafter connected at rigid joints. Bents are repeated at regular intervals along the length of a structure and resist both vertical and lateral loads. They are common in industrial buildings, bridges, and long-span structures.

Why It Matters in Bidding

Because bents repeat at fixed intervals, they let estimators price a structure as a multiple of one repeating unit, making steel or precast takeoffs faster and more accurate. Misreading bent spacing or connection type directly drives tonnage, fabrication hours, and erection crane time, all of which can swing a structural bid by a large margin.

Example

An estimator pricing a 400-foot warehouse counts 21 identical bents at 20-foot spacing, prices one bent's steel and connections, then multiplies to build the frame line item before adding bracing and the end walls.

Related Terms

Moment FrameColumnRafterLateral Load

Frequently Asked Questions

Wider spacing means fewer bents but heavier members and larger purlins or girts spanning between them, while tighter spacing means more repeated units of lighter steel. Estimators test both against the drawings because the trade-off shifts total tonnage, connection counts, and erection picks, all of which change the bottom-line price.
The structural drawings and framing plans show bent elevations, member sizes, and spacing, while connection details and the project specifications define whether joints are rigid (moment) or pinned. Reviewing both is essential because rigid connections add fabrication labor and material that pinned connections do not require.
Rigid, or moment, connections transfer bending across the joint, so they need stiffeners, thicker plates, and more welding or bolting than simple shear connections. That extra fabrication shop time and field labor must be carried in the bid, and overlooking it is a common source of underpricing on frame work.

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