Dynamic Behavioral Analysis Of Long-span Concrete Filled Steel Tubular Arch Bridges

In recent years, as a new-type bridge, concrete-filled steel tubular(CFST) arch bridge has been deeply developed in our country's construction,for its own merits and can luckily make agreement with the factual situation of bridge engineering.Accordingly,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, the development process of the concrete-filled steel tubular arch bridge is firstly reviewed.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 someone CFST arch bridge, establish 3-D finite element model of it with software.and analyze its natural vibration. Taking into account the major parameters of arch bridge (the ratio between width and span, leaning angle) and the other bridge structure (lateral structure type and hangers type), the effects of these parameters on natural vibration characteristic was studiedIn recent dozens of years, with bridges getting lighter and more flexible, meanwhile the speed and weight of vehicles growing greater, the problem for coupling vibration of vehicle-bridge becomes further outstanding. For the styles of highway bridges are diversified and the weight of vehicles is complex and uncertain, the bridge vibration analysis caused by moving vehicles becomes even more complex. During the transient dynamic analysis of someone CFST arch bridge, the time history responses of the structure underuniform velocity moving load and impact load are analyzed. Then the riding comfort is also evaluated when the vehicles is running.At last the responses of the structure under earthquake spectrums are briefly analyzed.