Discussion on Dynamic Characteristics of Extradosed Cable-stayed Bridge

摘要

Extradosed cable-stayed bridge, which also is named partial cable-stayed bridge, is a novel style bridge between girder bridge and cable-stayed bridge. Because of its advantageous structural function, special superiority in economy and architecture etc., more and more extradosed cablestayed bridges were constructed in the world. However, several definition methods for such bridge have been putting forward, and can not be coincident with each other. In this case, engineers will be confused during design. Otherwise, the amount of this type of existing bridges is still smaller than other bridge types. So it is necessary to study the dynamic characteristics of extradosed cablestayed bridge in detail to understand the forces and displacements during earthquake. There such bridges, which are located in Shanxi province and Hebei province respectively, were showed in this paper. Firstly, the parameters for design were provided. And then the dynamic characteristics of these there bridges were analyzed. Finally, dynamic characteristics that can reflect the dynamic response were summarized by reviewing the existing concepts and combining with the results of analysis conducted in the paper. The conclusions are valuable to further study on dynamic properties of extradosed cable-stayed bridges.