Design of CFST East Chaoyang Arch Bridge

The main bridge of East Chaoyang bridge is halfthrough concretefilled steel tube arch bridge(30m+120m+30m).The general design,construction features and the analysis and calculation of the internal force are presented in detail.Mechanics character of CFST such as stiffness and strength used in the structure analysis is calculated based on CFST uniform theory which considers the interplay between steel tube and concrete.This type bridge has a common problem of prominent vibration under heavy load traffic condition.Therefore,two methods are used to improve the dynamic character during the structure design of East Chaoyang bridge.One is to increase the stiffness of the bridge deck system,the other is to heighten the link stiffness between two arches.The stability analysis of the arch bridge is also discussed in detail.Some issues and advices merit attention during the design of CFST arch bridge are presented.