Abstract
In this study we deal with random vibrations of uniform Bresse–Timoshenko beams. In contrast with the original version of the Bresse–Timoshenkobeam theory, we utilize two truncated theories which do not contain the fourth order derivative with respect to time. It is shown that in some cases of damping, the mean square responses produced by these two theories coincide, whereas in other cases these quantities differ from each other. Different assumptions are made: -The beam is governed by different proportional damping.-It is subjected to a white noise as external excitation.-Is simply supported at both ends.It is advocated that it is preferable to employ the truncated version that is associated with additional effect of slope inertia, obtainable variationally.
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