The application of Karhunen–Loéve, or principal component analysis method, to study the non-linear seismic response of structures

The Karhunen–Loéve (K–L) method is used to interpret dynamic response data obtained from shaking table and pseudodynamic tests conducted on civil engineering structures subjected to earthquake loading. It is shown how the K–L method can be used to monitor on-line, or a posteriori, the structural response of non-linear dynamical systems. Results from these analyses make it possible to quantitatively verify the number and participation factors of non-linear modes and how they correspond to physical behaviour of the structure. Comments are made regarding the use of this technique in various fields including numerical calculations, experiments and control. Copyright © 2000 John Wiley & Sons, Ltd.