Abstract:In order to effectively improve the mechanical behavior of hogging moment area of continuous steel-concrete composite box girder bridge, taking the interchange project of West Binhe Road, Caihong Bridge and Landscape Avenue in Linfen City as an engineering case, the design method of hogging moment area of continuous steel-concrete composite box girder bridge based on jacking technology is proposed. The jacking design parameters including the construction order of bridge deck, jacking order of middle fulcrum and storage age of bridge deck are studied in order to make the bridge deck and steel girder reach the good mechanical behavior. And the whole construction process of structure alignment is monitored. The research shows that the Pilger process can effectively reduce the tensile stress of bridge deck at the middle fulcrum and the reducing amplitude is 60%. The order of jacking at the fulcrum will obviously influence the compressive pre-stress effect of bridge deck. The uniform compressive pre-stress of each fulcrum bridge deck is an important technical indicator to evaluate the order of jacking. The crack width reduces obviously with the increase of storage age of bridge deck. The completion of the interchange project of West Binhe Road, Caihong Bridge and Landscape Avenue in Linfen City is a successful attempt of continuous steel-concrete composite box girder bridge based on jacking technology in the municipal bridge engineering field. The design ideas and design parameter values of its hogging moment area will provide the good reference for the large-scale construction of steel-concrete composite bridges in China.
