Study On The Design Method Of Concrete Filled Steel Tubular Arch Bridge Of Jilin-Yanbian Express

The concrete-filled steel tubular arch bridge as a new structure style, is widely used in the national traffic industry these years. The design method and theory of the concrete filled steel tubular arch bridge have aroused wide concern of the scholars at home and abroad and the basic design theory system is formed. However, the design code for the concrete filled steel tubular arch bridge at home isn't highly targeted. At present, a lot of design methods and analysis theories need verification, perfection and extension in practical application. Especially in the identification of the rational completion stage and in the dynamic characteristics and stability, because of the various influencing factors, the present design theories need further discussing. The appearance of basket bowstring arch bridge with hand baskets tilting in a certain angel at the arch ribs, brings the problem of selecting reasonable tilting angels of the arch ribs. At the same time, the transverse brace arrangement has a certain effect on the force characteristics of the whole structure. Therefore, studying the influencing laws of tilting angels and transverse brace arrangement on the dynamic characteristics and stability of the basket bowstring arch bridge, is meaningful in perfecting the design methods and design theories for the concrete-filled steel tubular arch bridge.Based on the design project of the concrete-filled steel tubular arch bridge of Jilin-Yanji Express, this paper does researches in many aspects involved in the design of basket bowstring boom arch bridges, such as the confirmation of the steeve stretching force, the influences the tilting angels and transverse brace arrangement of the basket arch ribs have on the mechanical characteristics of the bridges, and the monolithic stability and earthquake resistance of the basket bowstring arch bridges. First, this paper concludes the method of confirming the rational completion stage for the concrete-filled steel tubular boom arch bridge and presents the confirming method for this bridge which is used to conform the rational completion stage, the suspender tensile force. Then using the dynamic analysis method, it analyses the effects the tilting angels and transverse brace arrangement of the basket arch ribs have on the dynamic characteristics of the bridges. And at last, parameters impact analysis for the flexure stability of the basket bowstring arch bridge is conducted. The main researches this paper conducts are as follows:1. Conclude the the method of confirming the rational completion stage for the concrete-filled steel tubular boom arch bridge. By comparing the applications of various methods, the confirming method of the rational completion stage for this bridge is presented. At last confirm the suspender tensile force.2. Use the finite-element dynamic analysis method to analyse the dynamic characteristics of basket bowstring boom arch bridge. The dynamic characteristic impact analysis is conducted for different tilting angels and transverse brace arrangements of the basket arch ribs . Based on the results, the reasonable tilting angels and transverse brace arrangements are confirmed.3. Use the finite-element buckling mode analysis method to analyse the flexure stability of the basket bowstring arch bridge, and present the analysis method to confirm the live load critical coefficients. And analyse the influences the arch rib tilting angels and transverse brace arrangements have on the bridge stability.