Where should compressible material not be placed in relation to high-strength bolts?

The appropriate placement of compressible material is critical in maintaining the integrity and performance of high-strength bolted connections. Featuring a robust clamping force is essential for the effectiveness of the connection, and placing compressible material within the grip of the bolt disrupts this force.

When compressible material is introduced within the grip (the area between the bolt head and the nut where the bolt engages with the connected materials), it can lead to a reduction in the friction between surfaces. This reduction compromises the bolt's ability to maintain tension, as the intended clamping force is diminished by the presence of the compressible material. Furthermore, this could result in the potential loosening of the bolt over time due to vibration or load variations, leading to mechanical failures.

In contrast, locating compressible material above the nut, below the bolt head, or next to the anchor does not violate the fundamental principles of the bolted connection, as these placements do not interfere with the clamping action of the connection itself. Therefore, knowing where compressible material should not be placed is essential for ensuring the reliability and safety of structural assemblies utilizing high-strength bolts.