Dynamic Behavioral Analysis Of Concrete-Filled Steel Tubular Arch Bridges

Concrete-filled steel tubular (CFST) arch bridge is a new-type structure of bridge, which has been deeply developed in the past more than ten years. The study on design theories of concrete-filled steel arch bridges gets relatively behind the engineering practice, and the study on dynamic performance of the structure gets relatively behind the study on static feature of the structure. As concrete-filled steel tubular arch bridges develop in the direction of large-span and lightweight style, the study on dynamical response of the structure under live loads such as vehicles, wind and earthquake is in need. In these thesis, on the basis of existing data collected of arch bridges and dynamics, simply introduce the development and application of the analytical method and finite element numerical analysis method of arch bridges. Taking the example of Pubugou CFST arch bridge,establish 3-D finite element model of it with software ANSYS, and analyze its naturalvibration. The effects on inherent vibration of the differences of structure parameters, the restriction of the deck and the effects of different arrangements of cross braces are analyzed. According to the theory analysis and engineering practice, the application of natural vibration features in bridge inspection is introduced. During the transient dynamicanalysis of Pubugou CFST arch bridge, the time history responses of the structure under uniform velocity moving load and impact load are analyzed, and the amplification coefficients of deflection and internal forces of the structure are intensively analyzed. At last the responses of the structure under earthquake spectrums are briefly analyzed.