Calculation And Analysis On The Steel Box Girder Of Long Span Cable-stayed Bridge By Incremental Launching Method

Firstly,this thesis introduces the development history of the incremental launching method and the research status at home and abroad,and makes comparisons between the traditional incremental launching method and the new walking-type ncremental launching technology by enumerating the advantages and disadvantages of them.Then,based on the steel box girder(beam with variable curvature of the production of pre-camber)of a large span cable-stayed bridge,which is constructed by the incremental launching method.Introduced the construction technology and process about this bridge in detail.Described the monitoring group how to control this bridge in the process of building this bridge.Then,applying major finite element software,based on the research result of monitoring group,also with the plan of design and construction group,established the pole system FEM of the whole bridge to analyse the stress of steel box girder in each working condition,and establishes the local analysis model of steel box girder by ansys,and further analyse the stress of every plate under adverse condition.Completed the major work of this paper.is as follows:(1)Emulating analyse the incremental launching bridge construction process,through"once landed " and "forced displacement" thinking to simulate height difference between the bottom of the box and the roof of the pier in the process.Continue to try the model to find appropriate plan about adjusting height of the pie,ensure that the top push in the line control in a reasonable range and the process of pushing in the safety;(2)Through analysising the model,we can get the support force and the bending moment of the steel box girder under various working conditions;(3)Based on the local analysis model of beam-shell hybrid finite element steel box girder,the stress of steel plate girder under adverse conditions is analyzed,and the stress of the plate is too large Reliable solution,and compare the stress of the plate under different solutions;(4)Introduce the construction technology and process of the multi-point push for the bridge,and introduce the concrete implementation plan of the bridge construction monitoring process,and provide reference for the similar construction.