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4.1.7.2.(1)
ApplicationIntent
OS2OP2OH4
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
[F20-OP2.1] [F22-OP2.4]
Application
Application 1: 
Dynamic approaches for determining wind effects on the building structure, for the design of buildings with an aspect ratio greater than 4, or whose height is greater than 120 m, or whose properties make them susceptible to vibration.
This applies to buildings described in Sentence 1.3.3.2.(1) of Division A and to buildings to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9] that are required to be designed in accordance with the requirements of Part 4.
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Intent
Intent 1: 
To limit the probability that the calculation of wind effects on the building structure will not take into account how the properties of the building structure affect dynamic amplification, which could lead to the excessive deformation of, or excessive stress in, structural elements, which could lead to damage to the building.
Intent 2: 
To limit the probability of the implementation of unacceptable design methodologies for the calculation of dynamic amplification due to wind, which could lead to the excessive deformation of, or excessive stress in, structural elements, which could lead to damage to the building.
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