Study Of Scheme Comparison For Wujiang Extra-Large Bridge

This article studies the extra-large bridge across the Wujiang River in Huangrui highway route interms of the brighe location, plan, main structure size, structure analysis of the static and dynamic, andtechinical and economic comparison, aiming at giving the feasibale and practical solutionsFirst of all, according to technical data of the geology, hydrology, meteorology, shipping, bridgespractical functions of the bridge siting, three kinds of bridge type alternatives have been drawn up: along-span prestressed concret continuous rigid frame bridge, a prestressed concret cable-stayed bridge anda steel trussed girder cable-stayed bridge. Secondly, the special bridge program has been applied to theintensity of bearing capacity and normal use stress check calculation, and the stability analysis of theconstruction and the bridge stage has been carried on. The results show that the structure and stability canmeet the standard requirements. For the procedures of the prestressed concret cable-stayed bridge with twotowers, the truss girder stress and strength, the strength of cable tower, cable force and stability calculationhave been applied, and the results show that the prestressed concret cable-stayed bridge various calculatingindexes can meet the requirements; For towers of the steel trussed girder cable-stayed bridge, the girderchord strength and stiffness, the strength of cable tower, cable force and stability calculation have beenapplied, and the results show that the steel trussed girder cable-stayed bridge various calculating indexescan meet the requirements; and a dynamic analysis has been carried on the above three kinds of bridges,three kinds of bridge6~10order fundamental frequency and the corresponding vibration mode have beenpresented. According to the dynamic analysis model and the ground motion input, E1and E2stage of threebridge internal force and displacement calculation have been made to each control section. The resultsshow that the calculation results of three kinds of bridges can meet the requirements of seismic code.Finally, a comprehensive campariosn of the technical safety, the maintenance later and the adaptability ofthe bridge has been carried out, and a recommended scheme for a long-span prestressed concret continuousrigid frame bridge has finally been formed.The research result has been applied in practical engineering, providing the main basis for thepreliminary design of the bridge.Hopefully this papaer can provide a reference for similar conditions ofbridge scheme selecting.