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4.1.8.17.(6)
ApplicationIntent
OS2OP2
ObjectiveOP2 Structural Sufficiency of the Building
Attribution
[F20,F22-OP2.1,OP2.4]
Application
Application 1: 
Determination of the storey seismic lateral forces where floors or roofs support a tank whose mass, including contents, is greater than 10% of the mass of the floor or roof, in areas where IEFaSa(0.2) is equal to or greater than 0.35 or in post-disaster 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 inertial seismic force applied by a tank to the building structure for structural design will not take into account the dynamic response of the tank containing liquid when subjected to the maximum expected seismic building 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.
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