Which rods hold purlins and girts in a straight line?

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Multiple Choice

Which rods hold purlins and girts in a straight line?

Explanation:
Brace rods provide the lateral restraint that keeps the horizontal members—purlins and girts—aligned in a straight line. They act as tension members, tying parts of the frame together so the purlins and girts don’t bow or shift under load, wind, or gravity. This keeps the roof and wall panels fitting correctly and maintains the overall geometry of the frame. Sag rods are used to address sagging effects, but they don’t actively hold the line of these horizontals. Eave angles and base angles serve as edge supports rather than keeping interior framing in proper alignment.

Brace rods provide the lateral restraint that keeps the horizontal members—purlins and girts—aligned in a straight line. They act as tension members, tying parts of the frame together so the purlins and girts don’t bow or shift under load, wind, or gravity. This keeps the roof and wall panels fitting correctly and maintains the overall geometry of the frame. Sag rods are used to address sagging effects, but they don’t actively hold the line of these horizontals. Eave angles and base angles serve as edge supports rather than keeping interior framing in proper alignment.

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