The influence of material damping to the similar model design and experimental analysis were studied by theoretical analysis. A similar model of an offshore platform is designed and constructed on the basis of the analysis. The modal experiments have been done on the model with the method of multi-point excitation and single-point response measurement. The dynamic parameters of the model were identified including natural frequencies, structural modes and shapes. The results showed that material damping does not affect the geometry of similar model and have a little effect on the natural frequency which can be ignored. But the influence to the dynamic responses is so great that material damping must be taken into account in the analysis of experimental data. In order to facilitate the application, the transformation relations of damping ratio and the damping factor are given in this paper. The comparison between experimental results the simulation results indicates the consistency of design and construction of the similar model and reliability of the experimental data.

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