The Structural Engineer > Archive > Volume 59 (1981) > Issues > Issue 3 > Correspondence on Natural Frequencies of Structures for Designers by A. Bolton
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Correspondence on Natural Frequencies of Structures for Designers by A. Bolton

Professor F. W. Williams (M) and Dr. J. R. Banerjee (Department of Civil Engineering and Building Technology, UWIST, Cardiff): It is vital that designers should be aware that the author’s method gives only some of the natural frequencies of structures, and that the second and other low natural frequencies are likely to be among those missed. This is illustrated by considering the rectangular grid of Fig 13, which consists of 1250 identical, rigidly jointed, inextensible members and is prevented from swaying.