In structural steel construction, what does the term 'slip-critical connection' refer to?
Correct Answer
C) A bolted connection where load transfer occurs through friction between connected parts
A slip-critical connection uses high-strength bolts tensioned to create friction between the connected parts, transferring loads through friction rather than bolt shear.
Why This Is the Correct Answer
A slip-critical connection is a bolted connection where high-strength bolts are tensioned to create significant clamping force between the connected steel parts. The load transfer occurs primarily through friction between the faying surfaces rather than through shear in the bolts themselves. This type of connection prevents slipping under service loads and is commonly used in critical structural applications where movement must be minimized, such as in bridges and high-rise buildings.
Why the Other Options Are Wrong
Option A: A temporary connection used during steel erection
This describes temporary connections used during construction, not slip-critical connections. Slip-critical connections are permanent structural connections designed for load transfer through friction, not temporary erection aids.
Option B: A connection designed to allow controlled movement during thermal expansion
This describes expansion joints or connections designed for thermal movement. Slip-critical connections are designed to prevent slipping and movement, not accommodate it. They maintain rigid connections through friction.
Option D: A welded connection that can accommodate slight misalignment
This describes welded connections with tolerance for misalignment. Slip-critical connections are bolted, not welded, and rely on friction between bolted surfaces for load transfer, not weld accommodation of misalignment.
Memory Technique
Think 'GRIP': slip-critical connections create a strong GRIP through friction - the bolts squeeze the parts together so tightly that friction does all the work, preventing any slip.
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