The Structural Engineer > Archive > Volume 59 (1981) > Issues > Issue 16 > Correspondence on A Simplified Method for Evaluating the Natural Frequencies and Corresponding Modal
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Correspondence on A Simplified Method for Evaluating the Natural Frequencies and Corresponding Modal Shapes of Multistorey Frames by E.H. Roberts and R.H. Wood

Professor F. W. Williams (M) (University of Wales Institute of Science and Technology): It is useful to note that Armstrong's notation enables the authors' method to be stated, much more concisely and simply, as an application of the familiar stiffness matrix method, as follows.