It presented an advance method based on stiffness similarity to ascertain equal similar relationships,which more effectively solved the design problem of model with difference of elastic modulus ratio in different parts between model and practicality,and through increasing additional mass, coherent similarity ratio of frequency between model and practical.

The dynamic similarity principle of the model of Yueyang Dongting Lake Bridge is analyzed by similarity theory, and similarity ratio of modal parameters is got by modal analysis theory.

The influences of centrifugal acceleration, similarity ratio and stress are discussed.

Leading into the similitude principle of simulation model test of structure,the method is established for calculating the similitude ratio of flexural moment against cracking of the normal section of reinforced concrete flexural members.

The authors also deduced similitude ratio of similitude criterion and mode parameter, and demonstrated rationality of three tower cable-stayed bridge model design of Yueyang Dongtinhu Bridge.

Based on the requirement of similar scale restricted on the fixed bed river model and the characteristic of the river, the river model for Fanglin stretch of Huaihe River main stream is designed.

According to the characteristics relating to elastic modulus and structural frequency of materials,in this paper,formulas for modifying the similarity scale and the converted prototype quantifies are proposed.