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4.1.8.4.(6)
ApplicationIntent
OS2OP2
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
[F20-OP2.1] [F22-OP2.4]
Application
Application 1: 
Determination of design spectral response acceleration values, S(T), to be used in earthquake design and analysis of buildings.
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 earthquake design and analysis will not take into account how site amplifications affect the response of buildings subjected to ground motions, which could lead to:
  • the excessive deformation of, or excessive stress in, the structural elements, which could lead to damage to the building, or
  • the excessive deformation of, or excessive stress in, the building structure, which could lead to damage to the building, which could impede the intended use and occupancy of the building.
Intent 2: 
To clarify how intermediate values of the design spectral response acceleration, S(T), are to be determined.
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