To limit the probability that the elastic storey shears, storey forces, member forces and deflections resulting from a Linear Dynamic Analysis will be proportioned in accordance with the design base shear, which could lead to structural failure, which could lead to harm to persons.
To limit the probability that the elastic storey shears, storey forces, member forces and deflections resulting from a Linear Dynamic Analysis will not be augmented by the effect of accidental torsion, which could lead to structural failure, which could lead to harm to persons.