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Q: Which of the following tension members is placed between two consecutive purlins in the roof truss?
  • A. Tees
  • B. Sag rod
  • C. Plates
  • D. Angles
Correct Answer: Option B - Sag bar– It is provided in purlins to support the section in bending about the minor axis. It provides lateral support to purlin to prevent sag in the direction parallel to the sloping roof, due to vertical loads. They are designed to support the component of roof loads parallel to the roof and the tension member.
B. Sag bar– It is provided in purlins to support the section in bending about the minor axis. It provides lateral support to purlin to prevent sag in the direction parallel to the sloping roof, due to vertical loads. They are designed to support the component of roof loads parallel to the roof and the tension member.

Explanations:

Sag bar– It is provided in purlins to support the section in bending about the minor axis. It provides lateral support to purlin to prevent sag in the direction parallel to the sloping roof, due to vertical loads. They are designed to support the component of roof loads parallel to the roof and the tension member.