Carpenter Red Seal Exam Prep · Question
A construction crew is lifting large roof trusses onto a building frame. If a sling is placed too close to the end of a long truss, what is the most likely consequence during the lift?
If a truss is lifted too far toward one end, the long unsupported section of the top or bottom chord and its associated web members can experience excessive com
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Question: A construction crew is lifting large roof trusses onto a building frame. If a sling is placed too close to the end of a long truss, what is the most likely consequence during the lift?
Answer options:
- The truss will sag excessively in the middle.
- The truss will rotate uncontrollably. ✅ The web members near the lift point may buckle due to unsupported compression.
- The top chord will experience increased tension, potentially breaking.
Correct answer: The web members near the lift point may buckle due to unsupported compression.
Explanation: If a truss is lifted too far toward one end, the long unsupported section of the top or bottom chord and its associated web members can experience excessive compressive forces, leading to buckling. Proper lifting should support the truss in a way that minimizes bending and compressive stresses, often using two lift points.
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