Research Of Control Of Incremental Launching Construction And Suspender Tension Of Tied Arch Bridge

The tied-arch bridge is a kind of combination structure of the beam and arch which is static determinate outside and statically indeterminate inside.The main stress components are the arch,the beam and the boom.There are many arch bridges with various system in China,but most examples built by the ILM are continuous beam.However,in the process of building tied-arch bridge with the ILM,the stress condition of the combination system is far more complex than others.So it is necessary to simulate the construction process accurately.The main work done in this paper is as follows:(1)The stress condition and analysis methods of the tied-arch bridge are summarized in this paper.The current situation of research status of the monitoring measurement of tied-arch bridge and ILM are introduced.Aiming at the stress condition of the tied-arch bridge,a plan of monitoring measurement including deformation and stress condition are drew up.(2)In this paper,the characteristics of the existing jacking construction simulation calculation method are studied.Combined with the specific situation of the project,the working load and the limit load in the process are calculated.The EFA software is used to establish the calculation model of the whole process of the ILM construction,and the stress and displacement in the construction process are analyzed.The limit load calculation and safety check of the temporary pier,which plays an important role in the ILM construction,are also finished.(3)After the ILM is done,next construction and cable force are analyzed by the EFA software according to the existing method.The complicated construction includes support removal,deck laying and suspender tension,such as structural cable force change,arch beam stress and full bridge displacement are studied in this part.Finally,based on the existing research results,the classic theory of measuring cable force is analyzed.A coefficient is introduced to measure the influence of boundary conditions.Using the EFA software to establish a single suspender model for research,a revising method is created to reducing the measurement error of cable force.