For structural engineers, specifying this standard adds minimal cost but eliminates massive liability. For contractors, using these chairs reduces rework and callbacks. For building owners, it means a foundation that will outlast the steel frame above it.
Result: During a moderate wind uplift event (85 mph), the mezzanine column experienced only 60% of its design load. Yet the anchor bolt chair legs buckled, the weld fractured, and the bolt pulled out of the concrete. The non-compliant chairs had no leg bearing check (Point 1 above) and used mild steel fillet welds too small for the applied load. aisi e 1 volume ii part vii anchor bolt chairs better
In the world of structural steel construction and reinforced concrete detailing, the smallest components often bear the heaviest burdens. Among these unsung heroes is the anchor bolt chair —a fabricated assembly designed to position and secure anchor bolts precisely within a concrete foundation before the pour. While many engineers spec a "standard chair," the benchmark for excellence is explicitly defined in AISI E 1 Volume II Part VII . Result: During a moderate wind uplift event (85
Disclaimer: Always consult the latest edition of AISI S100 and AISI E 1. This article is for informational purposes and does not replace professional engineering judgment. In the world of structural steel construction and
Next time you detail a moment frame, a heavy column, or even a light industrial rack, remember: The anchor bolt chair is not a cost to be minimized. It is a component to be optimized. And the path to optimization is paved by .