Research On The Construction Control And Structural Analysis For Separating High-speed Overpass

With the development of the national economy and people’s living standards improve, the demand increases every year for highway, high-speed overpass will inevitably arise, greatly ease the pressure on urban traffic. Prestressed concrete continuous bridge with the force structure of good performance, small deformation, less expansion joints, driving comfort and comfortable, simple and beautiful shape, small amount of maintenance engineering, seismic capability and other advantages in a span of 100 bridges in the most competitive 200m. It has occurred long span continuous beam bridge cantilever construction more complex structure, the construction process and more many factors, to bridge the state off-design condition requirements. To ensure good bridge linear and reasonable stress state, the construction of the bridge control is essential.Taking a freeway overpass separate engineering background, it introduced a high-speed separation overpass construction monitoring program; cantilever Cradle introduced the basic theory of the construction process; the establishment of a bridge finite element simulation model, and the structural analysis of construction stages effective control of the stress and strain state of the construction phase of the bridge, the bridge construction control provides a reliable theoretical basis.In this paper, the construction linear control process focuses on the control, according to the actual separation overpass project construction schedule, box beam elevation changes, concrete curing time, construction of temperature on the measured data is corrected, in taking into account the material parameters and construction temperature and other factors.By comparing the observed elevation and stress the theoretical value, the study shows, MIDAS CIVIL finite element model of a high-speed separation overpass construction is controlled by the effective and feasible, elevation and stress state of the bridge is a bridge to meet the design requirements, the bridge linear smooth appearance, construction monitoring tasks to be completed successfully.