Mechanical Analysis and Scheme Optimization of Incremental Launching Construction of Continuous Steel Box Girder Bridges
To study the stress and deformation laws during the incremental launching construction of steel box girder bridges,this paper used the finite element method to analyze the construction process of a three-span continuous steel box girder bridge.According to the analysis results,under the condition without a temporary support pier and the box girder was incrementally launched to the maximum cantilever state,the maximum deflection at the cantilever end reached 127.3 mm and the cantilever length was 49 m.At this moment,the deformation at the cantilever end of the guide girder exceeded the limitation from Specifications for Design of Highway Steel Bridge(JTG D64-2015).After arranging a temporary pier 2 m in front of PM1 Pier in the direction of the expressway,under the maximum cantilever state,the deflection at the cantilever end was reduced to 83.7 mm,and the deflection,support reactions,internal force,and stress of guide girders and steel box girders were decreased to different extents as well,which all met the specification requirements.The study results can provide certain references for similar bridge incremental launching constructions.
steel box girderincremental launching technologyfinite elementsafety analysis and control
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