Research Of Construction Monitoring And Control Of Long- Span Tied-Arch Bridge With Asymmetrical Splayed Arch Ribs

With the rapid development of our social economy, large scale bridge construction is getting faster and faster, and more and more large-span and complex bridges are being planned and constructed. Among them, long-span tied-arch with asymmetrical splayed arch ribs, which is novelty in structure and beautiful in appearance, has been widely used as city landscape bridges.There are many system conversions in the whole process of the large and complex bridge construction, we need to formulate a scientific and reasonable construction monitoring in the whole process of the bridge construction in order to achieve an ideal linear and stress state in the bridge structure. The structure of long-span tied-arch bridge with asymmetrical splayed arch is complex, which needs a lot of construction steps, the reasonable internal force state and ideal state of linear are not only related to the design, but also rely on the scientific and reasonable construction method. Long-span tied-arch bridge with asymmetrical splayed arch ribs use the method of falsework construction, the assembly of steel box arch and steel beam, the removal sequence of bracket, the tension sequence of the suspenders and tie-rods are a very complicated process, in order to ensure the final linear state and stress state of the bridge structure components that meets the design requirements, to monitor the whole process of the bridge construction is very necessary.In this paper, the engineering background is based on the construction of Chengdu Fuhe River Bridge, in the process of the structure construction, we need a simulation analysis to get the deformation and stress of the bridge structure, and developed a reasonable construction monitoring program. Establish finite element model of the whole bridge with specialized software Midas/Civil, to conduct Simulation calculation and analysis according to the actual construction process; Finite element analysis software Ansys is adopted to establish the steel combined section local model, which analysis the stress of the steel combined section local model.Though comparing and analyzing the measured and calculation data, using comprehensive control method for the construction monitoring, to correct and adjust the design parameters repeatedly in order to simulate the real situation of the bridge structure more accurately and apply the theoretical calculation to the next phase of the construction control that ensure the linear state and stress state meet the design requirement eventually.