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Carpenter Red Seal Exam Prep · Question

A falsework system for a 4.5 m high concrete wall features vertical shores. What is the minimum recommendation for the slenderness ratio (L/r) for compression members, such as these shores, to ensure stability, according to CSA S269.3 guidelines for falsework design?

CSA S269.3, Clause 9.6.1 states that the slenderness ratio (L/r) for timber compression members in falsework should not exceed 100, and for steel, it should not

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Question: A falsework system for a 4.5 m high concrete wall features vertical shores. What is the minimum recommendation for the slenderness ratio (L/r) for compression members, such as these shores, to ensure stability, according to CSA S269.3 guidelines for falsework design?

Answer options:

  • Should not exceed 50. ✅ Should not exceed 100 for timber members.
  • Should not exceed 200.
  • Slenderness ratio is not a direct concern for vertical shores.

Correct answer: Should not exceed 100 for timber members.

Explanation: CSA S269.3, Clause 9.6.1 states that the slenderness ratio (L/r) for timber compression members in falsework should not exceed 100, and for steel, it should not exceed 200. This limit helps prevent buckling failures.

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