In steel frame construction, what type of connection is most commonly used to attach steel beams to columns in commercial buildings?
Correct Answer
D) Bolted shear tab connections
Bolted shear tab connections are the most common method for connecting steel beams to columns because they are economical, easy to install, and provide adequate structural performance for most applications.
Why This Is the Correct Answer
Bolted shear tab connections are indeed the most commonly used connection type in commercial steel construction because they offer the optimal balance of cost, installation speed, and structural performance. These connections consist of a steel plate (tab) welded to the column and bolted to the beam web, allowing for simple field assembly. They provide adequate shear transfer while being much more economical than moment connections and easier to install than welded field connections. The standardization of these connections also makes them preferred by contractors and engineers alike.
Why the Other Options Are Wrong
Option A: Welded moment connections
Pinned connections is a general structural engineering term that describes the behavior of connections that transfer shear but not moment. While shear tab connections behave as pinned connections, this term is too vague and doesn't specify the actual connection method used in steel construction.
Option B: Riveted connections
Riveted connections are largely obsolete in modern construction, having been replaced by welding and high-strength bolting decades ago. They are labor-intensive, require specialized equipment, and are not cost-effective compared to modern connection methods.
Option C: Pinned connections
Welded moment connections are more expensive and complex, typically reserved for situations requiring rigid frame behavior or high moment transfer. They require skilled welders on-site and extensive quality control, making them less common for typical beam-to-column connections in commercial buildings.
Memory Technique
Think 'BEST' - Bolted connections are Economical, Simple, and Time-efficient, making them the standard choice for beam-to-column connections.
Reference Hint
AISC Steel Construction Manual - Chapter 10 (Design of Simple Shear Connections) or Florida Building Code Chapter 22 (Steel)
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