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Why must tilt-up panels be checked for temporary overturn during erection-stage wind?

Choices

  • (A) Unset bracing leaves tall lever arms reacting to parapet suction before diaphragms mobilise
  • (B) Wind never applies moment once panels vertical
  • (C) Construction wind loads are stipulated zero for cladding
  • (D) Only crane rigging dictates panel stability post lift

Correct answer: (A)

Unset bracing leaves tall lever arms reacting to parapet suction before diaphragms mobilise

Explanation

Without roof diaphragm ties panels act as slender cantilever plates to wind suction.

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Question 140 of 161