The Tension Control Optimization Analysis Of Tied Arch Bridge Suspender Of Long-span Steel Pipe Concrete Under The Deck

The paper takes the tied arch bridge of shen-dan passenger prince river as engineeringbackground, establishing a finite element bridge model and conducting analysis for this modelby the calculation software MIDAS CIVIL. The tension force of suspender is determined bybalance method, to ensure that the arch rib and main beam have a better dead load momentdistribution, and the force of suspender is more evenly, which is conducive to calculate theinitial tension of suspender in construction phase. Boom tension is adjusted optimizing tomake the internal forces of main beam and arch rib become more reasonable. The force ofsuspender.Is compared before and after forming bridge, we can see that the live load makes thesuspender tension increase, cable force has about the same growth rate, live load has a greaterimpact on the suspender. The main line of this paper is tension force adjustment of tied archbridge suspender, using three different methods to carry out a comparative analysis foroptimal adjustment of suspender force from a different perspective, these three methods arerigid suspender method, one frame drop method, rigid support beam method. According to theactual situation and results of the bridge, one frame drop method are able to meet therequirements whether from the design or construction; secondly, suspender tension sequenceoption1and option2of prince river tied arch bridge are calculated comparably, option2ismore reasonable and reliable by comparing the tensioning sequence program. Finally, thecable force testing principles are introduced, especially the frequency method. By comparingthe measured values and the target values of suspender cable force, the relative error is lessthan10%,which meets the conditions of dropping from shelf.Conducting tie beam off the shelf. Dropping shelf is completed, testing varioussuspender cable force, and determining whether to transfer cable.Through the comparison with design values to ensure that the cable tension of eachsuspender design did not exceed the allowable error range.According to the test results of cable force and the target cable tension provided byInstitute, two transfer cables are conducted, after the transfer cable is completed, we can seethat the suspender force of full-bridge is controlled uniformly, each target values and actuallymeasured values meet well, and they are within reasonable error range,from full andlocal bridge,the error is ideal,which can meet the design requirements of the suspender force.