Stiffness to control deformation

The importance of deformation control in enhancing safety and reducing damage and thus improving the reliability of construction in earthquakes is now well recognized (Section 8.2). The stiffness levels required to control damaging interaction between structure, cladding, partitions and equipment vary widely, depending upon the nature of components and the function of the construction, but stiff construction is obviously better than flexible in this regard. The seismic deformations of conventional construction can be greatly reduced by the use of seismic isolation (Section 8.5), so that relatively flexible moment resisting frames may be able to satisfy the design deformation criteria, and P-delta column moments will be greatly reduced.

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