Sensitivity Analysis of Natural Vibration Characteristics of Undercarriage Concrete-filled Steel Tube Arch Bridge
In order to study the factors affecting the natural vibration characteristics of the undercarriage concrete-filled steel tube arch bridge,the sensitive natural vibration characteristics of the undercarriage concrete-filled steel tube arch bridge were mainly analyzed based on the design parameters of the structure itself.A three-dimensional finite element model was established combined with nu-merical analysis software,and Multi-Ritz Vector Method was adopted.The influence of the transverse brace between the arch ribbed steel pipes,the wall thickness of the steel pipes and the diameter of the arch ribbed steel pipes on the natural vibration characteristics of the concrete-filled steel tube arch bridge is studied.The results show that the increase of the diameters of the transverse brace and steel pipe in the arch rib will increase the stiffness of the arch rib and enhance the stiffness of the whole structure,which has a great in-fluence on the natural vibration characteristics of the structure.The increase of arch rib steel pipe wall thickness basically does not af-fect the structural stiffness,so it does not affect the structure's natural vibration characteristics.Therefore,in the design process,we can focus on the specific selection of arch rib cross brace layout and optimization of arch rib steel pipe diameter.
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