VIBRATION ANALYSIS OF RIBBED PLATES WITH A RIGID INTERMEDIATE LINE SUPPORT

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 model synthesis method, with the constraint conditions enfo rced at the intermediate support by means of Lagrange multipliers. The model is verified by comparison with test results for double-span rib bed floor systems. As a special case, the model is also applied to pre dict natural frequencies of double-span plates without ribs. The poten tial of the modelling procedure in dealing with non-rigid or multiple intermediate line supports is discussed.