Modal Experiment on Elastic Foundation Slab and Identification of Dynamic Foundation Parameters

The free vibration modal experiments of elastic foundation free slab were conducted by hammer-hitting excitation method, and 7 order displacement modes and strain modes were obtained by analyzing transfer functions used Me£§scope software. The primary analysis was done on the experiment results and the site experience of vibration test on the elastic foundation slab was concluded. The finite element analysis of rectangular slab on Vlasov foundation was presented with thick element ADS1 which was formed by high quality element LR12-2. The vibration shapes of the slab on Vlasov foundation were analyzed. The rigid mode was used to identify Winkler foundation parameters; the foundation parameters of the two-parameter foundation were identified according to the principle of match of modal vibration shape by using two order frequencies. Results indicate that the finite element analysis program has better generalization and the vibration shapes of elastic foundation slab represent modal dense region.