Which material is primarily used to construct built-up members?

Which material is primarily used to construct built-up members?

• A. Rolled Shapes
• B. Reinforcing Bars
• C. Steel Plates
• D. Concrete Blocks

Answer: (C)

Built-up members are created by fastening together multiple steel plates to form a larger cross-section, such as the web and flanges of a beam. Thin plates are riveted or welded to other plates or shapes to tailor thickness, stiffness, and strength where needed. This plate-based construction is why steel plates are the primary material for built-up members—it's the plates that are stacked and joined to achieve the required section properties. Rolled shapes may be used as components, but the defining feature of a built-up member is that its strength comes from the assembled plates, not from a single rolled section. Reinforcing bars are used in concrete, not in metallic built-up members, and concrete blocks are used in masonry or non-metallic construction.

Built-up members are created by fastening together multiple steel plates to form a larger cross-section, such as the web and flanges of a beam. Thin plates are riveted or welded to other plates or shapes to tailor thickness, stiffness, and strength where needed. This plate-based construction is why steel plates are the primary material for built-up members—it's the plates that are stacked and joined to achieve the required section properties. Rolled shapes may be used as components, but the defining feature of a built-up member is that its strength comes from the assembled plates, not from a single rolled section. Reinforcing bars are used in concrete, not in metallic built-up members, and concrete blocks are used in masonry or non-metallic construction.