To study the effect of steel and carbon hanger on the static and dynamic performance of arch bridge structures,a long-span half-through railway arch bridge located in a mountainous area was taken as the research object.Finite element analysis models were established to conduct nonlinear dynamic simulation analysis.The vibration responses at different locations of the main girder and hangers were obtained and the effect of hanger materials on the wind-induced responses of arch bridge components was analyzed.The results indicate that:(1)Based on the principle of equal strength replacement,replacing the steel hangers of the arch bridge with carbon hangers can increase the dominant vibration mode frequency of the main girder by approximately 3%to 12%,and enhance the fundamental frequency of the hanger vibration by approximately 27%.(2)Compared to using steel hangers,the transverse displacement of the main girder increases by over 50%when carbon fiber hangers are adopted,and the transverse displacement of the hanger themselves increases by approximately 60%,while the vertical displacement of the main girder and the longitudinal displacement of the hangers are significantly reduced.(3)The wind-induced stress amplitudes of hangers made from different materials do not differ significantly,both approaching 3 MPa.(4)When carbon hangers are used,the wind-induced response frequency of the arch bridge is relatively concentrated,while when steel hangers are used,they are more dispersed,indicating a higher possibility of vibration occurrence.
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