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Acronymsaka: American Institute of Steel Construction

AISC (American Institute of Steel Construction)

In Plain English

The organization that sets the standards for structural steel design and construction.

Definition

The American Institute of Steel Construction is a nonprofit technical institute and trade association that establishes design and construction standards for structural steel in the United States. AISC's Specification for Structural Steel Buildings (AISC 360) and the Code of Standard Practice for Steel Buildings and Bridges (AISC 303) govern how structural steel is designed, fabricated, and erected. AISC also administers certification programs for steel fabricators and erectors.

Why It Matters in Bidding

AISC standards define how structural steel must be designed, fabricated, and erected, so estimators bidding steel-frame work must price labor and QA to the applicable AISC requirements, including any certification the spec demands. When a project specifies AISC-certified fabricators or erectors, that limits the bidder pool and affects subcontractor pricing, a constraint estimators must verify before relying on a low steel quote.

Example

Reviewing the structural spec, an estimator sees the project requires an AISC-certified fabricator and confirms the steel sub holds the certification before carrying their quote in the bid.

Related Terms

ACI (American Concrete Institute)ASTMIBC (International Building Code)

Frequently Asked Questions

Many specs require steel be furnished by an AISC-certified fabricator or installed by a certified erector. This narrows which subs can legitimately bid and can raise pricing. Estimators must confirm a quoting sub holds the required certification, because an uncertified bid that gets disqualified at award leaves the GC scrambling to cover scope.
AISC 360 is the design specification engineers use to size structural steel members and connections. AISC 303, the Code of Standard Practice, governs commercial and trade practices like tolerances, shop drawings, and erection responsibilities. Estimators reference 303 to understand scope splits and what is customarily included in a fabricator's price.
AISC requirements influence connection design, fabrication tolerances, and inspection, all of which carry cost. Specifying tighter standards or special inspection adds shop and field labor. Estimators should read the structural specs for AISC references so the steel quote includes the correct fabrication quality, welding inspection, and erection methods rather than a baseline assumption.

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