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4.1.8.12.(3)
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
Application
Application 1: 
Ground motion histories to be used in the Numerical Integration Linear Time History Method for earthquake design and analysis of buildings.
Exceptions: 
except as stated in Sentence 4.1.8.1.(1), which applies to areas where the spectral response acceleration amplified for site conditions equals the floor levels found in low seismicity regions with Site Class C (i.e. very dense soil and soft rock).
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 acceleration time-histories used in the numerical time-history method will not be spectrum-compatible and will not take into account how site amplifications affect the response of buildings subjected to ground motions, which could lead to structural failure, which could lead to harm to persons.
Intent 2: 
To direct Code users to Sentence 4.1.8.4.(6) for the determination of the design spectral response acceleration values, S(T), and their intermediate values.
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