Which component is attached to the bottom flange of the end frame roof beam?

Which component is attached to the bottom flange of the end frame roof beam?

• A. Brace angle
• B. Eave angle
• C. Base angle
• D. Sag rods

Answer: (C)

Understanding how end-frame connections anchor a pre-engineered building helps explain this one. The bottom flange of the end frame roof beam is where the base connection to the foundation lives. A base angle is fastened to that bottom flange and tied into the foundation (often via a base plate and anchor bolts), providing a stable footing and transferring the frame loads into the concrete. This role is distinct from brace angles, which brace the frame against lateral loads, sag rods, which act as tension bracing elsewhere, and eave angles, which relate to the roof edge rather than the foundation connection. So the component attached to the bottom flange is the base angle.