Structure Analysis Of Arch Rib Of Zhijing-he Huge Bridge During Construction

As a new type of bridge, despite of its short history, concrete filled steel tubular archbridges have a rapid speed of development. The key point to build a Long-Span ConcreteFilled Steel Tubular Arch Bridges is the period of construction. Full scaffold constructionlimits the span of concrete filled steel tubular arch bridges for a long period. Along withmaturity of the Non-Plank Construction Method, especially the application of cable-hoistingmethod, the used-fields of concrete filled steel tubular arch bridges are largely widened.Based on Zhijing-he huge Bridge in Hubei province which is a large span concrete-filled steeltubular bridge with a main span of 449.4m, this paper studies these sides on emphasis:1. This paper analyzes the determination of reasonable finished state, summaries twoways of constructive control and three kinds Of calculating the buckling cable force in thecable-hoisting method. Based on Zhijing-he huge Bridge, adopting the forward analysismethod, it analyzed every phase on construction. Then, it calculated the buckling force withtwo different ways of stretching and demolishing the cables.2. Analyzing the influence of the stresses of the arch ribs, the material quantity and thedifficulty of construction which are caused by the different ways of cable-hoisting, comparingthe different in total, it will find a reasonable way to erect the arch ribs with the cable-hoistingmethod.3. Building the finite element model of the long-span cable-stayed bridge at the longestcantilever construction stage, analyzing the effects of different ways of construction on thestability. Then, considering about the wind load, it will analyze the effects of wind loads onthe stability of the arch bridges.The conclusions indicates that in sides of the stresses of the arch ribs, the materialquantity, the difficulty of construction and construction stability, the Solution2 have its uniqueadvantage. Its characteristic is that Solution2 exchange the temporary cables in Solution1 forfirmly cables and adopt the principle of hoisting the anchor cable before stayed-buck le cable,making the force of the anchor cable more than that of the stayed-bucked. The unbalanceforce is balanced by the approach bridge. So, it gets the conclusion that the Solution2 is moresuitable in this bridge. This paper will have the reference significance to the building ofconcrete filled steel tubular arch bridges.