During steel frame construction, a contractor needs to connect a beam to a column. Which connection method provides the strongest moment-resisting joint?
Correct Answer
A) Welded connection with full penetration welds
Full penetration welds create a continuous connection that can transfer the full strength of the connected members, making them ideal for moment-resisting connections. Bolted connections, while strong, typically have some flexibility.
Why This Is the Correct Answer
Full penetration welds create a continuous metallurgical bond between the beam and column, essentially making them one piece of steel. This continuous connection can transfer the full moment capacity of the connected members without any slip or flexibility. The weld metal becomes part of the structural member itself, providing maximum rigidity and strength for moment resistance. Unlike mechanical connections, there are no bolt holes that create stress concentrations or connection flexibility that reduces moment capacity.
Why the Other Options Are Wrong
Option B: Bolted connection with high-strength bolts
Standard bolts (A307) are designed primarily for shear loads and have limited tensile strength. In moment connections, the bolts on the tension side must resist high tensile forces, but standard bolts lack the strength and pretension needed for reliable moment transfer. The connection will have inherent flexibility due to bolt hole clearances and potential bolt elongation under load.
Option C: Bolted connection with standard bolts
While high-strength bolts (A325 or A490) are much stronger than standard bolts and can be used in moment connections, they still create a mechanical connection with inherent flexibility. The bolt holes create stress concentrations, and even with proper pretension, there will be some slip and flexibility in the connection that reduces its moment-resisting capacity compared to a welded connection.
Option D: Pin connection
Pin connections are specifically designed to transfer only shear forces and allow rotation between members. They provide zero moment resistance by design, as the pin allows the connected members to rotate freely relative to each other. This is the opposite of what's needed for a moment-resisting connection.
Memory Technique
Think 'WELD = WELDED TOGETHER FOREVER' - welded connections make two pieces act as one, providing maximum moment resistance. Bolts are like handshakes (some flexibility), welds are like permanent bonds.
Reference Hint
AISC Steel Construction Manual - Chapter J (Connections) and Chapter 8 (Moment Connections)
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