STRESS ANALYSIS AND LINEAR CONTROL DURING THE CONSTRUCTION PROCESS OF STEEL BOX FORMWORK COVER BEAM FOR PORTAL PIERS OF OVERCROSSING EXISTING LINES
The newly built Qianxian connection section of the Xifa Intercity Railway will cross the Xiyin Passenger Dedicated Line and Xiping Railway with a gantry pier structure;Permanent steel box formwork is installed on the outer side of the portal pier to replace the support of the cover beam formwork.All loads on the concrete structure of the cover beam are borne by the steel box formwork.To effectively control the safety and stability of the cover beam structure,batch pouring of concrete is adopted to tension the prestressed tendons,and the cover beam construction is completed in stages.In the article,the finite element calculation software midas CiVil2020 and midas NFX 2017 R1 are used to establish a finite element model of steel box formwork cover beams.The static performance of the bridge is calculated and analyzed.Through force analysis of segmented assembled beam bridges,structural stress analysis under different working conditions is obtained.Corresponding construction measures are taken based on the stress situation,which greatly saves construction time and reduces safety risks while ensuring the safety of existing line operation,It can provide reference for the calculation of similar bridge structures.
existing linesportal piersteel box formworkforce analysislinear control
万方数据
维普
