Research On Wind-vibration Response And Structural Parameters Of Canopy With Columns Between Railway Passenger Station Lines

The rapid development of China's railways has made the size of passenger stations along the line larger and larger.The steel canopy between the columns of the lines is widely used in the construction of railway stations in China in the new period.The structure is satisfied with the open space and beautiful and light shape.The use and image needs of modern high-speed rail passenger stations have become an indispensable part of the current railway station.In this paper,the three-dimensional pipe truss canopy structure widely used in the column canopy between lines is studied.The three-dimensional pipe truss between the column canopy usually adopts the "open" structural system with large span and large column spacing.The wind resistance design of the structure is the focus of the design process.The wind resistance of the canopy is mainly affected by the structural parameters.The current specification has not yet systematically described the decisive role of the station layout on the structural parameters of the inter-column canopy,and the current research on the impact of structural parameters on the wind-induced vibration response is not comprehensive.Based on the basic theory of wind vibration and long-span roof design theory,using MATLAB numerical analysis software and ANSYS structural analysis software,taking Fuyang standing pipe truss double-span column canopy as the engineering background,the change rule of the structure's wind-induced vibration response with structural parameters is studied.Based on the sensitivity analysis method,important structural design parameters are obtained,and a reasonable value range is determined to provide theoretical basis for the design of such structures.The research content and main conclusions of the thesis are as follows:(1)Based on the long-span roof design theory,the ANSYS finite element model was established according to the design parameters of the column canopy between the lines of Fuyang Station,and the modal analysis was carried out.It is found that the low-order natural frequency of the structure differs greatly and increases uniformly.In the higherorder modal region,as the order of the vibration mode increases,the frequency difference between the adjacent two orders decreases rapidly.The low-order vibration mode of the structure is torsion as a whole,and the high-order vibration mode is partial torsion,and the canopy roof is mainly vibrated perpendicular to the direction of the strand.(2)Based on the linear filtering method,MATLAB numerical analysis software was used to simulate the pulsating wind speed and wind pressure time history curve acting on the structure.Combined with ANSYS structural analysis software,the most unfavorable wind direction angle of the structure was studied.When the wind direction angle is 0 °,the wind direction is perpendicular to the travel direction of the train,and the structure generates the largest wind-induced vibration response.Changing the wind direction causes it to gradually shift toward the train travel direction,and the structure's windinduced vibration response also gradually decreases.(3)The dynamic characteristics of the canopy are greatly affected by the structural parameters.This paper studies the influence law of the height and thickness of the truss,as well as the column diameter,column height,along-strand span,vertical strand span and longitudinal section length of the structure on the wind-induced vibration response of the structure.The sensitivity analysis of each parameter was carried out to quantitatively evaluated the sensitivity of wind and vibration response variables such as deformation and stress to various structural parameters.It is found that the important design parameters of the structure are the vectorspan ratio,column diameter,vertical strand span,and column height,and the secondary parameters are the straight strand span,high span ratio,and longitudinal section length.(4)The value range of important structural design parameters is studied and the envelope of the allowable column height under different column specifications,different typical station site cross sections and different vector span ratios is obtained.It is found that under the same column specifications,with the increase of the number of platforms and strands,the maximum allowable value of the structural column height gradually decreases;appropriately reducing the structure's sagittal ratio can significantly increase the maximum allowable value of the structural column height.