Final answer:
The minimum edge distance for bolted joints in primary structures should be at least 1.5 times the diameter of the bolt, according to traditional rules of thumb, for maintaining structural integrity and durability of the joint.
Step-by-step explanation:
The minimum edge distance for bolted joints in primary structures should be sufficiently large to prevent tearing or rupture of the edge, which could lead to a failure of the joint. The traditional rule of thumb is that the minimum edge distance from the center of the bolt to the edge of the plate should be no less than 1.5 times the diameter of the bolt. In specific engineering design codes such as the AISC (American Institute of Steel Construction) Standards, this value can be more detailed and take into account factors like the joint configuration, type of load, and the material used. Regardless, the edge distance is an important factor for the structural integrity and durability of the bolted joint.