Which of the following is not a purpose of bridging in a floor frame?

Bridging in a floor frame mainly serves to enhance the structural integrity and stability of the floor system. The primary purposes include increasing load capacity, providing lateral stability, and supporting overall structural performance.

When considering why making each joist stronger is not a purpose of bridging, it's important to understand that bridging does not directly increase the inherent strength of individual joists. Instead, it distributes loads across the entire framing system and helps prevent joists from twisting or bending under load. This is crucial for maintaining the alignment and overall performance of the flooring system, but it does not enhance the strength of the joists themselves.

The other purposes listed emphasize the role of bridging in supporting the overall structural integrity of the floor frame, which is critical in ensuring that the system can handle expected loads and maintain stability over time.