Wind-Induced Buffeting Time-Domain Analysis And The Influence Of Porous Fence For Long-Span Combined Highway And Railway Cable-Stayed Bridge

As the construction of the railway has come to a new era,It’s clearly that the numble of the long-span bridge,which combines highway and railway,is growing very fast.Especialy the cable-stayed,which could satisfied both the requirement for safety and the increasing travel speed of the rail,is playing a more and more important role. The problem of wind-induced vibration, which is not only related to the fatigue of bridge but also affects driving cormfort, can’t just be ignored.Although the adoption of porous fence can apparently induce train for the aerodynamic force indeed,it would surely bring some unexpected influence on the bridge structure itself. It’s necessary to study the influence in the wind-induced buffeting time-domain analysis. And it would be a portion of this thesis.In this thesis, a long-span combined highway and railway cable-stayed bridge was adopted to do research about wind-induced buffeting time-domain analysis. The thesis maily Include these following aspects:1. Considering its own characteristics of the long-span combined highway and railway cable-stayed bridge, the paper also has adopted conclusion about correlation characteristics of natural wind from previous researcher, thus a reasonable and effective method has been adopted to simplify the local wind environment.2. The data was collected from the wind tunnel section model test.which has been successful achived in XNJD-1 wind tunnel.Then the static wind load and buffeting load were transformated,so both kinds of data were applied to ANSYS for the further calculation.3. With the aid of finite element program ANSYS,the calculated modal of the long-span combined highway and railway cable-stayed bridge was established.Then with this model,the domain bufeeting analysis was available.And the influence of aerodynamic Admittance was discussed,also the difference situation beteen with or without the porous fence were compared.4. The thesis was summarized and some conclusions were presented by forms and pictures, besides, the research problems need to be further studyed were indicated.