Construction Process Monitoring And Force Performance Analysis Of A Steel Tube Concrete Tied Arch Bridge Of A Railway

The concrete-filled steel tubular arch bridge has high rigidity,beautiful shape,large span capability,low driving noise and high passenger comfort.Therefore,it is widely used in high-speed railway construction.This paper takes the construction of the newly-built Shangqiu Hefei-Hangzhou high-speed railway passenger line 1-80 m under the concrete-filled CFST arch bridge as the background,combined with the force characteristics of the tied arch bridge,the construction monitoring technology of the bridge is comprehensive.The study also detailed the local stress distribution of the arch.The main work contents and conclusions of the thesis are as follows:(1)Using the finite element software Midas/Civil to simulate the bridge,the finite element calculation model of the bridge is given;the whole construction stage is divided,and the stress and deformation of the beam and arch rib of each construction stage are calculated.Regularity;summed up the static performance law of the underlying tie-bar arch construction stage and operation stage.(2)Through the on-site construction monitoring of the tied arch bridge,the measured monitoring data of each stage is measured,so that the results of the monitoring work can be evaluated;The results of the work are evaluated;the conclusions and recommendations based on the above research results provide a reference for the construction monitoring of such bridges in the future.(3)Through the analysis of the finite element model of the arched Midas/FEA,the local stress distribution and the variation law in the construction and operation phases are obtained.Stress concentration occurs at the support of the beam end support,the anchorage of the prestressed tendon,the joint of the water chestnut,and the intersection of the beam and arch.It should be taken seriously and necessary measures should be taken during construction.