| In this paper,taking the suspension bridge of Lantau Peak ancient city in Dandong as an example,the finite element software ANSYS is used to determine the equilibrium state of the cable and the main cable.Finite element software ANSYS was used to establish the finite element model,and the static analysis was carried out under the bridge state and the normal service state.The influence of wind resistance cable angle,wind cable tension and transverse span ratio of main cable on dynamic characteristics of suspension bridge is studied by means of comparative analysis.According to the characteristics of pedestrian load,according to the international standard organization ISO standard,this paper carries out the vibration analysis of single and different population density.The main conclusions of this paper are as follows:(1)using finite element software ANSYS software,the method and flow chart of the bridge shape of the cable stayed bridge with wind resistance are determined.The influence factors of the maximum stress and displacement maxima of suspension bridge are analyzed.(2)wind cable inclination in general is set to 45°,if difficult,wind cable inclination should be between 30 ° ~45 °;the influence of the dynamic characteristics of wind cable tension on bridge structure significantly,wind resistance of main cable tension should be 1~1.5 times the maximum static wind pressure design.(3)the horizontal vector spatial cable suspension bridge span ratio has a certain effect of vibration frequency,and in a certain range,the transverse and torsional stiffness increased with the increase of rise span ratio increased;when the transverse span ratio is less than 1/100,the space property of the cables is almost non-existent.(4)the international standards organization ISO standard,not only consider the single load and the crowd load on the pedestrian load model considered more comprehensive,proposed footbridge vibration analysis,the international standards organization ISO specification. |
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