Study On Cable Tension Optimization Of Completed Bridge And Construction Stages Of1-128m Arch Bridge

In the constituent members of Tied Arch Bridge, the boom is the components to contactthe bridge and the arch rib. The dead load and live load from floor system are passed to thearch Rib through boom, the cable force affect the load-carrying capability of the wholestructure. After the bridge structure system is selected, the load-carrying capability is mainlydetermined by the suspender force, The strained condition of the structure can be adjusted bychanging suspender force So carry out the optimization of cable force of Tied Arch Bridge isnecessary. The Optimization of Cable Force of Tied Arch Bridge not only to meet completedbridge condition reasonable under stress, but also to ensure the safety of the construction andoperational phases, so it is important to determine the reasonable cable force between theconstruction phase.The article was under construction monitor control of1-128m Tied Arch Bridge crossthe Urumqi River engineering background, Study on the optimization of rational cable forceunder dead load of completed bridge, the rational construction force between the constructionphase was analysed. Mainly completed the following work:(1) The classification and characteristics of Tied Arch Bridge are expounded, the conceptof cable force optimization is introduced briefly.(2) The finite element model establishment process of the1-128m Tied Arch Bridgeacross Urumqi River was introduced, the calculation model was built using the finite elementsoftware Midas/Civil. The status of research methods of cable force optimization under deadload in recent years was summed up, and various methods were compared, its advantages anddisadvantages were analyzed. The methods which to determine the rational Constructioncable force were Summarized, and each method were reviewed.(3)The constrained minimum energy method was chosen to found the Mathematicalmodel that determine the optimum preliminary tensions of the suspenders at reasonablestatus of completed bridge of the1-128m Tied Arch Bridge across Urumqi River, with theWhole deformation energy of the arch rib and the beam as the objective function, make thecable force within limiting sphere, while the girders moment control to a lesser extent, thequadratic programming method was used to adjust into tensile force status of completedbridge, it was solved have the aid of MATLAB and optimization toolbox to write computerprogram, and obtained optimal control cable force which meet the controlled conditions.(4) With rigid support continuous beam method to determine the initial boom cableforces, and the results were analyzed, indicate the algorithm is irrational; laying two boomtensioning sequence, the use of an iterative method to calculate reasonable dress boomconstruction force, the calculation results were analyzed, discussed the pros and cons between different tensioning sequence; using influence matrix method to determine the cable forceduring construction phase of the second boom stretch-draw, to successful achieve the goalthat the boom requires only two stretch-draw, can make the tensioning suspender forcereached a bridge design value.(5) The concept of similarity theory was expounded; according to similarity theory,1-128m Tied Arch Bridge scale model a cross Urumqi River was produced as a similar ratioof1/16, and rational completed bridge cable force and reasonable construction cable force ofthe scale model were determined; through cable tension test s of cale model, collect relevantcable tension and stress data, and compared the measured values with the theoretical values.Finally, the main conclusions and innovation of this paper was expounded and outlookthe future research.