Modal analysis and experiment test of continuous beam bridge

The mode shape function of the pier was offered to study the dynamic deformation feature of the continuous beam bridge sited on the elastic foundation.The static experiment and modal test for a continuous beam model were carried out indoor,the results were compared with those of finite element method(FEM),and some conclusions about the dynamic feature of continuous beam in the longitude and transverse direction were obtained accordingly.It is pointed that the whole structure's low vibration performs as the pier's flexural bending if the superstructure and substructure vibrate together.The dynamic parameters from the test have an error of 6% compared with the theoretical ones derived from modal analysis,which testifies the presented mode shape.The results indicate that: this mode shape can be well applied in analyzing the beam's dynamic feature;and the modal analysis method can give a good reference to the seismic analysis for the same type of bridge.2 tabs,11 figs,10 refs.