Which type of shims is recommended by the AISC for setting column base plates?

The recommendation from the American Institute of Steel Construction (AISC) for setting column base plates is to use steel shims. Steel shims provide the necessary strength and rigidity required for structural applications, particularly in the context of steel columns and base plates.

Using steel shims ensures that the load is properly distributed and the base plate is securely aligned. Steel can withstand the forces and stresses that occur in structural applications, making it a superior choice compared to other materials like wood, plastic, or rubber, which may deform or compress over time under heavy loads. Additionally, steel shims can be accurately machined to precise thicknesses, allowing for fine adjustments during installation to achieve level and plumb conditions necessary for proper structural performance.

Choosing steel shims enhances the overall stability and integrity of the structure, reducing the risk of settlement or misalignment in the columns as the structure is subjected to various loads throughout its lifecycle.