In recent years,new urban viaduct in China have begun to use large cantilever bilateral box steel-concrete composite beams in-stead of traditional steel plate composite beams or groove shaped steel box composite beams.In the process of erecting the steel beam,the torsional rigidity of the closed steel box girder is large,and there is no need to add diaphragms or slant support to ensure structural stability;The substructure can be directly equipped with uncovered beam column piers,saving the width of land and increasing the clearance under the bridge.This article takes the main urban viaduct of the rapid renovation project of Qianheng Road in Fuzhou City as the engineering background,introduces the selection ideas and structural design of the large cantilever bilateral box steel-concrete composite beams struc-ture,uses the finite element analysis software MIDAS CIVIL to establish a spatial beam grid model and a plate beam model,and conducts longitudinal and transverse calculation analysis on the composite beam structure to verify its feasibility and rationality,To provide reference for the design and selection of urban viaduct under similar conditions.
维普
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