According to the AISC Steel Construction Manual, which of the following is not an acceptable method for setting column base plates?

Setting column base plates properly is crucial for ensuring the stability and integrity of a structure. The American Institute of Steel Construction (AISC) Steel Construction Manual outlines acceptable methods and materials for this important task.

Steel shims are widely accepted due to their durability and ability to maintain their form under load. They provide a reliable means of leveling and supporting the base plate. Concrete pads also serve as a solid foundation for column base plates, offering significant compressive strength and stability.

Plastic shims can be used as well, particularly in situations where moisture control and corrosion are considerations, such as in environments that are prone to rust.

However, treated-hardwood shims are not considered an acceptable method for setting column base plates. While hardwood can provide some level of support, it is subject to degradation over time due to environmental factors, such as moisture and pests. Additionally, hardwood does not provide the same level of load-bearing capacity and consistency as the other options. Therefore, selecting materials that maintain structural integrity over time is crucial for safety and performance, making treated-hardwood shims unsuitable for this application as per the AISC guidelines.