Research On Mechanical Performance Analysis And Construction Monitoring Of Steel Box Multi-arch Bridge

Based on previous research results,this paper takes the Baigou River Bridge,the main project of the Hebei section of the Beijing-Xiong’an New Area Expressway,as the research background,and conducts mechanical performance analysis and construction monitoring research on this bridge.The Baigou River Bridge is a17-span steel box multi-arch bridge divided into(6+5+6)triples.The finite element calculation software is used to simulate the bridge structure,and the internal force data,stress data and deflection deformation data of the control section of each construction stage are obtained.The data is analyzed and the structural stress and linear change law during the bridge construction process are studied.Provide a theoretical basis for bridge construction monitoring;analyze the stress situation of the bridge during the operation stage,which is used for reference and reference for the design of similar bridges;after that,the influence of different load forms on the shear lag effect of thin-walled box girder is introduced in detail,and the The changing law of the shear lag effect of three-box single-cell simply supported steel box girder under different load conditions provides a reference for the design of simply supported steel box girder in actual engineering.This article first introduces the main characteristics,development and research status of steel box arch bridges,the research status of construction monitoring,and a brief overview of the construction methods of steel arch bridges.Then,the force analysis of steel box double arch bridges during construction and operation stages is carried out.It includes the internal force,stress and deformation of the bridge in each construction stage and operation stage,and analyzes the shear lag effect of the simply supported steel box girder in the open area of the steel box multi arch bridge in different load forms in the hollow area of the steel box multi-arch bridge under different load forms is analyzed,and the steel box multi-arch bridge is first integrated Force analysis,followed by partial force analysis,hoping to grasp the mechanical properties of the steel box multi-arch bridge from both the overall and the details;finally,the multi-arch bridge construction monitoring was studied,including the purpose,principle,method,process,and content of the construction monitoring,The factors affecting the accuracy of construction control,and a detailed introduction to the construction monitoring program of the steel box double-arch bridge.