Determining Of Reasonable Completion State And Simulation Analysis Of Construction Controlling Of Cable-stayed Bridges

Reasonable completion state and construction state are important topics of thetheoretical research of cable-stayed bridge. This paper takes Hekou bridge as theengineering background, researches the application of influence matrix method in thecable optimizing of completion state,and studies the construction control withunstressed state method.①From the angle of virtual displacement principle and the principle of minimumpotential energy, this paper expounds the theoretical basis of unstressed state method.Based on a simple numerical example,the phased construction bridge balance equationreceived. According to thebasic principle of unstressed state method, the one-to-onerelationshipbetween unstressed length difference and cable force change is derived.Verifies the rigor and reliability of the unstressed state method from the angle of theory.②Researches the influence matrix method in the cable force optimization principleof the cable-stayed bridge, and takes Hekou bridge as the engineering background,combined with the unknown load factor function of Midas/civil,calculates the cableforce of completion state,optimizesit and receive the reasonable completion state.Analysis and get the regular and significance of the influence matrix under the conditionof main girder displacement, and researches the calculation method of impact value.From the optimized vertical displacement of girder, the horizontal displacement alongthe bridge of tower and the cable force,it can be seen that it’s workable to optimizecable with the influence matrix method, especially when combined with unknown loadfactor function in the Midas/civil, it will be more convenient.③According to the principle of catenary, the method for calculating the unstressedlength of cable is deduced, and iteratesthe unstressed cable length with excel.Establishes the model of construction stage of Hekou bridge. Take the unstressed lengthof cable as the factor in construction control,and ensure that the unstressed length ofcable tension to the unstressed length of completion target state. Contrastthe cable forcebetween forward direction calculating and completion taget state, differenceis existbecause of the creep and shrinkage of concrete, but it can be eliminate through iterativecalculation, which illustrates the correctness and reliability of the unstressed statemethod.