What additional inspection is required for slip-critical joints?

For slip-critical joints, the primary concern is ensuring that the surfaces that are intended to bear the shear load maintain sufficient contact to prevent slippage under service conditions. The faying surfaces are the areas where two structural elements meet and are critical in slip-critical connections.

To ensure effective load transfer and prevent slippage, it is essential to check the condition of these faying surfaces. This inspection typically involves examining the surfaces for cleanliness, uniformity, and proper surface preparation, which may include roughening or coating treatments designed to enhance friction. If the faying surfaces are contaminated with dirt, grease, or other materials, or if they are not prepared according to specified standards, the joint may not perform as intended.

While checking bolt tension and other inspections are necessary in various contexts, the specific focus on faying surfaces is what distinguishes the inspection requirements for slip-critical connections. This ensures that the connection functions correctly under design loads without the risk of slippage, which is crucial for the safety and integrity of the structure.