Research on the Internal Force and Deformation Changes of Large-Span Cantilever Casting Construction Arch Bridge Caused by Wind-Induced Vibrations from Fastening Stays
This article takes the Yashiqing Extra Large Bridge,located on the expressway from Jinsha to Tongzi via Renhuai,as the research object to evaluate the construction safety impacted by wind during the construction period.The numerical simulation method is used to establish a three-dimensional model and analyze the internal force and deformation changes of large-span cantilever casting construction arch bridges caused by wind-induced vibration from fastening stays.The results indicate that the vertical vibration displacement caused by wind load at the 1/4 span of the arch bridge,is significantly smaller than that of the maximum cantilever section.The maximum vertical vibration response of the wind load at the end of the maximum cantilever section can reach 13.38 cm,which is 3.7 times the maximum vertical displacement of the former position.When the vibration frequency is lower than the fundamental frequency,the vertical displacement power spectrum at the maximum cantilever of the arch bridge is greater than that at the 1/4 span.Conversely,when the vibration frequency exceeds the fundamental frequency,the vertical displacement power spectrum at the two positions is close.When the wind-induced vibration comes from fastening stays,the axial force at the arch foot position of the arch bridge during the maximum cantilever stage is the most unfavorable.The maximum bending moment occurs at the 1/8 span,while the maximum tensile stress of the arch ring's top plate is located at the 1/2 span.Additionally,the maximum tensile stress of the arch ring's bottom plate is situated at the 1/8 span.
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