When designing and constructing large-scale industrial shells, silos, and flat-bottom tanks, structural integrity is paramount. Anchor bolts are required at the supports to secure the structure against wind, seismic activity, and operational loads. However, simply bolting a structure to a concrete foundation isn't always enough. Without proper load distribution, high localized stresses can damage the shell.
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Oversized or slotted holes are used to allow column placement after concrete pour, but excessive slot length reduces bearing area and introduces bending in the bolt. Standard gusset designs often fail to account for
Standard gusset designs often fail to account for the complex local stresses where a bolt attaches to a shell. The AISI method is widely considered better for several technical and practical reasons: Without proper load distribution
While anchor chairs are excellent for discrete bolt locations, they should not be placed further than 10 feet apart. If the required bolt spacing is less than 2 feet 6 inches, the suggests a continuous top ring may be more efficient than individual chairs.
Field welding of chairs is rare (usually shop-fabricated), but poor shop welds lead to brittle fracture under tension.