Abstract
A numerical model for dynamic responses of ribbed plates with a rigid intermediate line support is presented. The model is based on the free interface modal synthesis method, with the constraint conditions enforced at the intermediate support by means of Lagrange multipliers. The model is verified by comparison with test results for double-span ribbed floor systems. As a special case, the model is also applied to predict natural frequencies of double-span plates without ribs. The potential of the modelling procedure in dealing with non-rigid or multiple intermediate line supports is discussed.
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