Research On The Dynamic Characteristics Of High-altitude Billboard Structure

With the rapid development of social economy as well as urban and social modernization continues to advance,China's highway network construction is increasingly developed.In the 1930 s,some western countries began to build highways.By the 1960 s,the expressway system was in a period of rapid development.Economic development and developed transport system are inseparable.As an indispensable means of transport for modern life and production,the car has been integrated into the various parts of human society.So the construction of the highway has become a necessary foundation of national development and prosperity.There is no doubt that as a developing country,the construction of highways is in a period of rapid development in China.Expressway has many advantages,such as large capacity,safe to drive,low transportation costs,and driving economic development of the surrounding.With the rapid development of the highway,large-scale billboards around the highway are increasingly taken seriously.In this paper,the finite element software ANSYS is used to analyze the structure of the high-altitude billboard.The modal analysis under self-weight,vibration analysis under wind load and dynamic characteristics under earthquake action for single-column high-altitude billboards and double-column high-altitude billboards are analyzed,which can provide reference for the force characteristics and design methods of different billboards.The details are as follows:(1)The finite element model of single column high-altitude billboard structure and double column high-altitude billboard structure is established by using the method of comprehensive modeling in finite element analysis software ANSYS.(2)The finite element model of the billboard structure is analyzed by ANSYS.The vibration period and vibration mode of the structure under the self-weight are obtained,and the self-vibration characteristics of the structure are analyzed.It is found that the first two modes of the structure are the whole vibration,and for the single column high-altitude billboard structure,the first order mode is the in-plane vibration,and the first order mode of the double column high-altitude billboard structure is out-of-plane vibration.(3)On the basis of modal analysis,the geometric nonlinear finite element analysis method is used to analyze the wind-induced response of the structure by ANSYS,and the dynamic response of the structure under wind load is obtained.(4)ANSYS was used to analyze the seismic response of the finite element model ofbillboard structure.The displacement and stress cloud images of the billboard structure under the four kinds of seismic records are extracted,and the plots of the displacement,reaction force and stress of the billboard structure are drawn.Through the analysis of the results,the design advice is put forward,which can provide some reference for the engineering design and further research of the billboard structure.