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9.20.15.2.(1)
ApplicationIntent
OS2OP2
ObjectiveOS2 Structural Safety
Attribution
[F20-OS2.1,OS2.3]
Application
Application 1: 
Installation of reinforcement for loadbearing, above-ground masonry elements, in buildings more than 1 storey in building height that are in regions where the spectral response acceleration Sa(0.2) is greater than 0.55 and in buildings 3 storeys in building height that are in regions where the spectral response acceleration Sa(0.2) is greater than 0.35 and less than or equal to 0.55 to which Part 9 applies [see Sentence 1.3.3.3.(1) of Division A for application of Part 9]:
  • where the wall height above the foundation wall does not exceed 11 m, and
  • in which the roof or floor system above the first storey is not of concrete construction.
Exceptions: 
except as stated in Sentence 9.20.1.1.(2), which applies to buildings other than described above, or where the masonry is designed for specified loads on the basis of ultimate and serviceability limit states.
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Intent
Intent 1: 
To limit the probability of inappropriate installation, which could lead to inadequate ductility, which could lead to an inadequate resistance to shear and tensile stresses induced by earthquake loads, which could lead to structural failure of masonry, which could lead to harm to persons.
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