In Plain English
Quick Answer
A vertical support that transfers weight from floors and roofs down to the foundation.
Definition
Definition
A vertical structural member that carries compressive loads from beams, girders, or slabs down to the foundation. Columns may be made of steel, concrete, wood, or masonry. Slender columns are also designed to resist buckling under high compressive forces.
Context
Why It Matters in Bidding
Columns are core structural items whose material, size, and connections drive significant cost in the structural package, whether steel tonnage, concrete and formwork, or reinforcing. Accurate column takeoffs feed the framing estimate and coordinate with foundation and connection scopes, so errors propagate through the whole structure bid. Distinguishing column types and special slender or composite designs affects both pricing and which trade carries the work.
Example
Example
On a steel-frame office, the estimator counts each column line, totals the tonnage by section size, and adds base plates, anchor bolts, and connection material before applying the fabrication and erection rates.
See Also
Related Terms
FAQ
Questions Contractors Ask
How are columns quantified in a structural estimate?
Steel columns are taken off by section size and length, converted to weight, and summed as tonnage with connection material and base plates added. Concrete columns are quantified by volume for concrete and formwork plus reinforcing steel by weight. The takeoff also captures base plates, anchor bolts, splices, and fireproofing where required by spec.
What scope items connect to columns in a bid?
Columns tie into foundations through base plates and anchor bolts, into beams and girders through connections, and often require fireproofing, painting, or cladding. Estimators coordinate these interfaces so anchor bolt setting, grout, and connection steel aren't double-counted or missed between the foundation, structural steel, and finishes packages.
Why does column slenderness matter for cost?
Slender columns are governed by buckling, so engineers may upsize the section, add bracing, or specify higher-strength material to resist it. That raises material and sometimes fabrication cost compared to a stockier column carrying the same axial load. Estimators price the section actually specified rather than assuming a minimum size based on load alone.
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